{"id":2895,"date":"2022-04-24T13:01:41","date_gmt":"2022-04-24T13:01:41","guid":{"rendered":"http:\/\/sinovalveco.com\/?p=2895"},"modified":"2026-03-25T07:28:06","modified_gmt":"2026-03-25T07:28:06","slug":"osy-valve","status":"publish","type":"post","link":"https:\/\/ntgdvalve.com\/ru\/osy-valve\/","title":{"rendered":"\u041a\u043b\u0430\u043f\u0430\u043d OS&amp;Y \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0432 \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u043c \u043f\u043e\u043b\u043e\u0436\u0435\u043d\u0438\u0438, \u0435\u0441\u043b\u0438 \u0448\u0442\u043e\u043a \u043f\u043e\u0434\u043d\u044f\u0442 \u0432\u0432\u0435\u0440\u0445 | \u0420\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u043e \u043f\u043e \u043a\u043b\u0430\u043f\u0430\u043d\u0430\u043c OSY"},"content":{"rendered":"<div class=\"post-meta\">\n<p><strong>Last Updated:<\/strong> March 2026<\/p>\n<p><strong>Reviewed by:<\/strong> NTGD Valve Engineering Team<\/p>\n<p><strong>Expertise:<\/strong> Industrial Gate Valves, Fire Protection Systems, Shut-off Valve Engineering<\/p>\n<\/div>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #0a0a0a;color:#0a0a0a\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #0a0a0a;color:#0a0a0a\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#An_OS_Y_is_in_the_open_position_if\" >An OS&amp;Y is in the open position if?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#How_to_Tell_if_an_OS_Y_Valve_Is_Open_or_Closed\" >How to Tell if an OS&amp;Y Valve Is Open or Closed<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Quick_Identification_Table\" >Quick Identification Table<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Why_the_Visible_Stem_Matters\" >Why the Visible Stem Matters<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#What_Does_OS_Y_OSY_Mean_in_Valves\" >What Does OS&amp;Y (OSY) Mean in Valves?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#What_Is_a_Valve_Yoke\" >What Is a Valve Yoke?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#OS_Y_vs_Outside_Stem_and_Yoke\" >OS&amp;Y vs Outside Stem and Yoke<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Why_the_Term_Matters_in_Procurement\" >Why the Term Matters in Procurement<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#How_an_OS_Y_Valve_Works\" >How an OS&amp;Y Valve Works<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Opening\" >Opening<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Closing\" >Closing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Core_Operating_Principle\" >Core Operating Principle<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Practical_Engineering_Value\" >Practical Engineering Value<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Main_Components_of_an_OS_Y_Valve\" >Main Components of an OS&amp;Y Valve<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Valve_Body\" >Valve Body<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Bonnet\" >Bonnet<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Gate\" >Gate<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Stem\" >Stem<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Yoke\" >Yoke<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Seats\" >Seats<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Packing_and_Gland\" >Packing and Gland<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Operator_or_Actuator\" >Operator or Actuator<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#OS_Y_Valve_vs_Non-Rising_Stem_Valve\" >OS&amp;Y Valve vs Non-Rising Stem Valve<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Comparison_Table\" >Comparison Table<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#NTGD_Engineering_Data\" >NTGD Engineering Data<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#When_to_Choose_OS_Y\" >When to Choose OS&amp;Y<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#When_a_Non-Rising_Stem_Valve_May_Be_Chosen\" >When a Non-Rising Stem Valve May Be Chosen<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#OS_Y_Valve_Technical_Specifications_and_Selection_Criteria\" >OS&amp;Y Valve Technical Specifications and Selection Criteria<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Typical_Selection_Criteria\" >Typical Selection Criteria<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Key_Questions_Before_Selection\" >Key Questions Before Selection<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Practical_Selection_Rule\" >Practical Selection Rule<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Typical_Applications_of_OS_Y_Gate_Valves\" >Typical Applications of OS&amp;Y Gate Valves<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Common_Applications\" >Common Applications<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Fire_Protection_Use\" >Fire Protection Use<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Industrial_Use\" >Industrial Use<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Application_Boundary\" >Application Boundary<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#NTGD_Engineering_Insight_Common_OS_Y_Issues_in_Real_Projects\" >NTGD Engineering Insight: Common OS&amp;Y Issues in Real Projects<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#1_Misreading_Valve_Condition\" >1. Misreading Valve Condition<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-39\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#2_Excessive_Packing_Compression\" >2. Excessive Packing Compression<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-40\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#3_Lack_of_Full-Stroke_Exercise\" >3. Lack of Full-Stroke Exercise<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-41\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#4_Wrong_Valve_Choice_for_the_Service\" >4. Wrong Valve Choice for the Service<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-42\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#5_Installation_Clearance_Overlooked\" >5. Installation Clearance Overlooked<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-43\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#6_Fire_Protection_System_Freeze_or_Low-Temperature_Risk\" >6. Fire Protection System Freeze or Low-Temperature Risk<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-44\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Advantages_and_Limitations_of_OS_Y_Valves\" >Advantages and Limitations of OS&amp;Y Valves<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-45\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Advantages\" >Advantages<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-46\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Limitations\" >Limitations<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-47\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Practical_Takeaway\" >Practical Takeaway<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-48\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#OS_Y_Valve_Inspection_and_Troubleshooting\" >OS&amp;Y Valve Inspection and Troubleshooting<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-49\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Valve_Is_Hard_to_Operate\" >Valve Is Hard to Operate<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-50\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Leakage_Around_the_Stem_Area\" >Leakage Around the Stem Area<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-51\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Valve_Position_Is_Unclear\" >Valve Position Is Unclear<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-52\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Internal_Shut-Off_Is_Unsatisfactory\" >Internal Shut-Off Is Unsatisfactory<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-53\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Frequently_Asked_Questions_OS_Y_Valve_Open_Position_More\" >Frequently Asked Questions (OS&amp;Y Valve Open Position &amp; More)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-54\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#An_OS_Y_valve_is_in_the_open_position_if\" >An OS&amp;Y valve is in the open position if?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-55\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#How_do_you_tell_if_an_OS_Y_valve_is_open_or_closed\" >How do you tell if an OS&amp;Y valve is open or closed?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-56\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#What_is_the_difference_between_OS_Y_and_non-rising_stem_valves\" >What is the difference between OS&amp;Y and non-rising stem valves?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-57\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#What_does_OS_Y_mean_on_a_valve\" >What does OS&amp;Y mean on a valve?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-58\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#What_is_a_valve_yoke\" >What is a valve yoke?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-59\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Is_an_outside_screw_and_yoke_valve_in_the_open_position_if_the_stem_is_raised\" >Is an outside screw and yoke valve in the open position if the stem is raised?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-60\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#What_does_%E2%80%9Can_OS_Y_valve_is_in_the_open_position_if%E2%80%9D_mean_in_practice\" >What does \u201can OS&amp;Y valve is in the open position if\u201d mean in practice?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-61\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#What_is_the_difference_between_OS_Y_valve_open_vs_closed\" >What is the difference between OS&amp;Y valve open vs closed?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-62\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#What_should_be_checked_during_OS_Y_valve_inspection\" >What should be checked during OS&amp;Y valve inspection?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-63\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Are_OS_Y_valves_required_for_fire_protection_systems\" >Are OS&amp;Y valves required for fire protection systems?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-64\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Can_OS_Y_valves_be_installed_horizontally\" >Can OS&amp;Y valves be installed horizontally?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-65\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#How_often_should_OS_Y_valves_be_exercised\" >How often should OS&amp;Y valves be exercised?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-66\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#OS_Y_Valve_Engineering_Support_Resources\" >OS&amp;Y Valve Engineering Support &amp; Resources<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-67\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#NTGD_Certifications_Trust_Signals\" >NTGD Certifications \/ Trust Signals<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-68\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Free_Download_OS_Y_Valve_Quick_Reference_Guide\" >Free Download: OS&amp;Y Valve Quick Reference Guide<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-69\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Free_Engineering_Selection_Support\" >Free Engineering Selection Support<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-70\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Request_a_Custom_Quote_for_OS_Y_Gate_Valves\" >Request a Custom Quote for OS&amp;Y Gate Valves<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-71\" href=\"https:\/\/ntgdvalve.com\/ru\/osy-valve\/#Summary\" >Summary<\/a><\/li><\/ul><\/nav><\/div>\n<h3 data-section-id=\"awndzn\" data-start=\"100\" data-end=\"139\"><span class=\"ez-toc-section\" id=\"An_OS_Y_is_in_the_open_position_if\"><\/span>An OS&amp;Y is in the open position if?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"140\" data-end=\"448\"><strong data-start=\"140\" data-end=\"254\">An OS&amp;Y valve is in the open position if the stem is raised and visibly protrudes above the handwheel or yoke.<\/strong><br data-start=\"254\" data-end=\"257\" \/><strong data-start=\"257\" data-end=\"372\">An outside screw and yoke valve is in the open position if the rising stem is fully lifted and clearly visible.<\/strong><br data-start=\"372\" data-end=\"375\" \/><strong data-start=\"375\" data-end=\"448\">Stem up = OS&amp;Y \/ OSY valve open. Stem down = OS&amp;Y \/ OSY valve closed.<\/strong><\/p>\n<p data-start=\"450\" data-end=\"654\">This is the fastest field rule for visual identification. It is also the reason OS&amp;Y valves are widely used in systems where operators, inspectors, and maintenance teams must confirm valve status quickly.<\/p>\n<p data-start=\"656\" data-end=\"839\"><strong data-start=\"656\" data-end=\"688\">Quick answer for inspection:<\/strong> partial stem rise should not be assumed to mean fully open. Full-travel confirmation is recommended during commissioning, inspection, and maintenance.<\/p>\n<hr data-start=\"841\" data-end=\"844\" \/>\n<p data-start=\"1974\" data-end=\"2207\">An <strong data-start=\"1977\" data-end=\"1991\">OS&amp;Y valve<\/strong> is a <strong data-start=\"1997\" data-end=\"2023\">rising stem gate valve<\/strong> in which the threaded stem is located outside the valve body. OS&amp;Y stands for <strong data-start=\"2102\" data-end=\"2128\">Outside Screw and Yoke<\/strong>. In many projects, it is also described as an <strong data-start=\"2175\" data-end=\"2206\">outside stem and yoke valve<\/strong>.<\/p>\n<p data-start=\"2209\" data-end=\"2465\">The visible stem movement is the defining feature of this design. When the valve opens, the stem rises. When the valve closes, the stem lowers. That external movement makes valve status easier to verify than on designs where the stem travel is not visible.<\/p>\n<p data-start=\"2467\" data-end=\"2674\">This matters in <strong data-start=\"2483\" data-end=\"2574\">fire protection, water distribution, pump room layouts, and industrial shut-off service<\/strong>, where a fast and unambiguous visual check can reduce inspection error and support safer operation.<\/p>\n<p data-start=\"2676\" data-end=\"2696\">This guide explains:<\/p>\n<ul data-start=\"2697\" data-end=\"2967\">\n<li data-section-id=\"il1wvs\" data-start=\"2697\" data-end=\"2745\">how to tell if an OS&amp;Y valve is open or closed<\/li>\n<li data-section-id=\"196t8fz\" data-start=\"2746\" data-end=\"2769\">what OS&amp;Y \/ OSY means<\/li>\n<li data-section-id=\"1y6i2vv\" data-start=\"2770\" data-end=\"2791\">how the valve works<\/li>\n<li data-section-id=\"1gsyme7\" data-start=\"2792\" data-end=\"2838\">how it compares with a non-rising stem valve<\/li>\n<li data-section-id=\"hgarv5\" data-start=\"2839\" data-end=\"2900\">what engineers should check during selection and inspection<\/li>\n<li data-section-id=\"1jfxwd9\" data-start=\"2901\" data-end=\"2967\">how to move from identification to specification and procurement<\/li>\n<\/ul>\n<hr data-start=\"2969\" data-end=\"2972\" \/>\n<h2 data-section-id=\"86052t\" data-start=\"2974\" data-end=\"3023\"><span class=\"ez-toc-section\" id=\"How_to_Tell_if_an_OS_Y_Valve_Is_Open_or_Closed\"><\/span>How to Tell if an OS&amp;Y Valve Is Open or Closed<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"3025\" data-end=\"3202\"><strong data-start=\"3025\" data-end=\"3041\">Quick Answer<\/strong><br data-start=\"3041\" data-end=\"3044\" \/><strong data-start=\"3044\" data-end=\"3151\">An OS&amp;Y valve is in the open position if the stem is raised and visibly protruding above the handwheel.<\/strong><br data-start=\"3151\" data-end=\"3154\" \/><strong data-start=\"3154\" data-end=\"3202\">If the stem is lowered, the valve is closed.<\/strong><\/p>\n<p data-start=\"3204\" data-end=\"3304\">This is the most direct answer to the common search query: <strong data-start=\"3263\" data-end=\"3303\">\u201can os&amp;y is in the open position if\u201d<\/strong>.<\/p>\n<h3 data-section-id=\"150x9pz\" data-start=\"3306\" data-end=\"3336\"><span class=\"ez-toc-section\" id=\"Quick_Identification_Table\"><\/span>Quick Identification Table<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"TyagGW_tableContainer\">\n<div class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"3338\" data-end=\"3604\" data-extentions-extra-tablecapture-id=\"744409\">\n<thead data-start=\"3338\" data-end=\"3380\">\n<tr data-start=\"3338\" data-end=\"3380\">\n<th class=\"\" data-start=\"3338\" data-end=\"3350\" data-col-size=\"md\">Condition<\/th>\n<th class=\"\" data-start=\"3350\" data-end=\"3364\" data-col-size=\"sm\">Visual Sign<\/th>\n<th class=\"\" data-start=\"3364\" data-end=\"3380\" data-col-size=\"sm\">Valve Status<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"3395\" data-end=\"3604\">\n<tr data-start=\"3395\" data-end=\"3499\">\n<td data-start=\"3395\" data-end=\"3457\" data-col-size=\"md\">Stem raised and clearly visible above the yoke or handwheel<\/td>\n<td data-start=\"3457\" data-end=\"3491\" data-col-size=\"sm\">Gate lifted away from the seats<\/td>\n<td data-start=\"3491\" data-end=\"3499\" data-col-size=\"sm\">Open<\/td>\n<\/tr>\n<tr data-start=\"3500\" data-end=\"3604\">\n<td data-start=\"3500\" data-end=\"3559\" data-col-size=\"md\">Stem lowered with little or no visible upward projection<\/td>\n<td data-start=\"3559\" data-end=\"3594\" data-col-size=\"sm\">Gate seated in shut-off position<\/td>\n<td data-start=\"3594\" data-end=\"3604\" data-col-size=\"sm\">Closed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"3606\" data-end=\"3865\">A correct field judgment should be based on <strong data-start=\"3650\" data-end=\"3705\">visible stem position plus full-travel confirmation<\/strong>, not on guesswork. In real systems, a partially raised stem can be mistaken for a fully open valve if installers or inspectors do not verify the actual travel.<\/p>\n<figure id=\"attachment_8639\" aria-describedby=\"caption-attachment-8639\" style=\"width: 1536px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-8639\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-open-vs-closed-diagram.png\" alt=\"OS&amp;Y valve open vs closed diagram showing stem up open position and stem down closed position with flow direction\" width=\"1536\" height=\"1024\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-open-vs-closed-diagram.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-open-vs-closed-diagram-768x512.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-open-vs-closed-diagram-18x12.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-open-vs-closed-diagram-600x400.png 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><figcaption id=\"caption-attachment-8639\" class=\"wp-caption-text\">Quick visual guide to identify OS&amp;Y valve open and closed positions<\/figcaption><\/figure>\n<h3 data-section-id=\"14f1aog\" data-start=\"4318\" data-end=\"4350\"><span class=\"ez-toc-section\" id=\"Why_the_Visible_Stem_Matters\"><\/span>Why the Visible Stem Matters<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"4351\" data-end=\"4638\">A visible rising stem is not just a mechanical detail. It is an inspection advantage. In systems where valve status must be verified quickly, a visible stem reduces ambiguity and helps operators confirm whether the shut-off path is open or closed without relying only on handle position.<\/p>\n<hr data-start=\"4640\" data-end=\"4643\" \/>\n<h2 data-section-id=\"46islt\" data-start=\"4645\" data-end=\"4684\"><span class=\"ez-toc-section\" id=\"What_Does_OS_Y_OSY_Mean_in_Valves\"><\/span>What Does OS&amp;Y (OSY) Mean in Valves?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"4686\" data-end=\"4792\"><strong data-start=\"4686\" data-end=\"4792\">OS&amp;Y meaning in valves = outside screw and yoke, a rising-stem configuration with visible stem travel.<\/strong><\/p>\n<ul data-start=\"4794\" data-end=\"4978\">\n<li data-section-id=\"r0nhlm\" data-start=\"4794\" data-end=\"4896\"><strong data-start=\"4796\" data-end=\"4813\">Outside Screw<\/strong> means the threaded part of the stem is outside the pressure boundary of the valve.<\/li>\n<li data-section-id=\"11vzrzk\" data-start=\"4897\" data-end=\"4978\"><strong data-start=\"4899\" data-end=\"4907\">Yoke<\/strong> is the external frame that supports and guides the operating assembly.<\/li>\n<\/ul>\n<p data-start=\"4980\" data-end=\"5166\">Because the stem thread is external, the stem rises when the valve opens and lowers when the valve closes. This is why OS&amp;Y valves are commonly grouped under <a href=\"https:\/\/ntgdvalve.com\/understanding-rising-stem-gate-valves-features-and-benefits\/\">rising stem gate valves<\/a>.<\/p>\n<h3 data-section-id=\"wg4z08\" data-start=\"5168\" data-end=\"5193\"><span class=\"ez-toc-section\" id=\"What_Is_a_Valve_Yoke\"><\/span>What Is a Valve Yoke?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"5194\" data-end=\"5402\">A <strong data-start=\"5196\" data-end=\"5210\">valve yoke<\/strong> is the external support structure that holds and guides the stem assembly. In simple terms, it is the frame that helps keep the operating mechanism aligned while the stem travels up and down.<\/p>\n<h3 data-section-id=\"1t9yq5l\" data-start=\"5404\" data-end=\"5437\"><span class=\"ez-toc-section\" id=\"OS_Y_vs_Outside_Stem_and_Yoke\"><\/span>OS&amp;Y vs Outside Stem and Yoke<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"5438\" data-end=\"5614\">In practice, the terms <strong data-start=\"5461\" data-end=\"5487\">outside screw and yoke<\/strong> and <strong data-start=\"5492\" data-end=\"5517\">outside stem and yoke<\/strong> are often used interchangeably. Both refer to a valve whose stem movement is externally visible.<\/p>\n<h3 data-section-id=\"2t8bqe\" data-start=\"5616\" data-end=\"5655\"><span class=\"ez-toc-section\" id=\"Why_the_Term_Matters_in_Procurement\"><\/span>Why the Term Matters in Procurement<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"5656\" data-end=\"5771\">For engineers and buyers, the term OS&amp;Y does not just describe a nameplate feature. It signals a valve design with:<\/p>\n<ul data-start=\"5772\" data-end=\"5931\">\n<li data-section-id=\"1ts8ayz\" data-start=\"5772\" data-end=\"5801\">visible position indication<\/li>\n<li data-section-id=\"18nwign\" data-start=\"5802\" data-end=\"5822\">rising stem travel<\/li>\n<li data-section-id=\"kxmiml\" data-start=\"5823\" data-end=\"5881\">different space requirements from non-rising stem valves<\/li>\n<li data-section-id=\"oopy9l\" data-start=\"5882\" data-end=\"5931\">inspection advantages in the right applications<\/li>\n<\/ul>\n<hr data-start=\"5933\" data-end=\"5936\" \/>\n<h2 data-section-id=\"1qwn5tv\" data-start=\"5938\" data-end=\"5964\"><span class=\"ez-toc-section\" id=\"How_an_OS_Y_Valve_Works\"><\/span>How an OS&amp;Y Valve Works<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"5966\" data-end=\"6107\">An OS&amp;Y valve is designed for <strong data-start=\"5996\" data-end=\"6018\">full shut-off duty<\/strong>, not throttling. The valve opens and closes by moving a gate vertically inside the body.<\/p>\n<figure id=\"attachment_8637\" aria-describedby=\"caption-attachment-8637\" style=\"width: 1536px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-8637\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-working-principle-flow-path-diagram.png\" alt=\"OS&amp;Y valve working principle diagram showing gate movement stem motion and flow path during open and closed operation\" width=\"1536\" height=\"1024\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-working-principle-flow-path-diagram.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-working-principle-flow-path-diagram-768x512.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-working-principle-flow-path-diagram-18x12.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-working-principle-flow-path-diagram-600x400.png 600w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><figcaption id=\"caption-attachment-8637\" class=\"wp-caption-text\">Working principle of an OS&amp;Y valve illustrating flow path and gate movement<\/figcaption><\/figure>\n<h3 data-section-id=\"c2viz6\" data-start=\"6109\" data-end=\"6120\"><span class=\"ez-toc-section\" id=\"Opening\"><\/span>Opening<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"6121\" data-end=\"6354\">When the handwheel or actuator drives the valve in the opening direction, the stem rotates and travels upward through the external thread arrangement. As the stem rises, it lifts the gate away from the seats and clears the flow path.<\/p>\n<h3 data-section-id=\"1ox15md\" data-start=\"6356\" data-end=\"6367\"><span class=\"ez-toc-section\" id=\"Closing\"><\/span>Closing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"6368\" data-end=\"6538\">When the valve is operated in the closing direction, the stem rotates and travels downward. This pushes the gate back into the shut-off position and blocks the flow path.<\/p>\n<h3 data-section-id=\"142zfp2\" data-start=\"6540\" data-end=\"6568\"><span class=\"ez-toc-section\" id=\"Core_Operating_Principle\"><\/span>Core Operating Principle<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"6569\" data-end=\"6761\">The critical point is not only that the gate moves, but that <strong data-start=\"6630\" data-end=\"6685\">the stem position changes visibly outside the valve<\/strong>. That visible motion is what makes OS&amp;Y valves easier to verify in service.<\/p>\n<h3 data-section-id=\"xpb3on\" data-start=\"6763\" data-end=\"6794\"><span class=\"ez-toc-section\" id=\"Practical_Engineering_Value\"><\/span>Practical Engineering Value<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"6795\" data-end=\"6954\">This visible stem movement is not just a mechanical feature; it is also a practical inspection benefit in systems where valve status must be confirmed quickly.<\/p>\n<p data-start=\"6956\" data-end=\"7146\">In NTGD inspection practice, stem travel visibility should be checked together with full shut-off verification before shipment, installation handover, or major maintenance return-to-service.<\/p>\n<hr data-start=\"7148\" data-end=\"7151\" \/>\n<h2 data-section-id=\"193hp7j\" data-start=\"7153\" data-end=\"7188\"><span class=\"ez-toc-section\" id=\"Main_Components_of_an_OS_Y_Valve\"><\/span>Main Components of an OS&amp;Y Valve<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"7190\" data-end=\"7258\">An OS&amp;Y gate valve typically includes the following main components:<\/p>\n<h3 data-section-id=\"15qg96m\" data-start=\"7260\" data-end=\"7274\"><span class=\"ez-toc-section\" id=\"Valve_Body\"><\/span>Valve Body<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"7275\" data-end=\"7472\">The body is the main pressure-retaining part of the valve. It contains the flow passage and connects to the piping system through flanged, threaded, grooved, or welded ends depending on the design.<\/p>\n<h3 data-section-id=\"fgorru\" data-start=\"7474\" data-end=\"7484\"><span class=\"ez-toc-section\" id=\"Bonnet\"><\/span>Bonnet<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"7485\" data-end=\"7608\">The bonnet encloses the upper internal section of the valve and forms part of the pressure boundary together with the body.<\/p>\n<h3 data-section-id=\"yn99g1\" data-start=\"7610\" data-end=\"7618\"><span class=\"ez-toc-section\" id=\"Gate\"><\/span>Gate<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"7619\" data-end=\"7729\">The gate is the internal closure element. It moves upward to open the valve and downward to shut off the flow.<\/p>\n<h3 data-section-id=\"yno621\" data-start=\"7731\" data-end=\"7739\"><span class=\"ez-toc-section\" id=\"Stem\"><\/span>Stem<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"7740\" data-end=\"7919\">The stem transmits motion from the handwheel or actuator to the gate. In an OS&amp;Y valve, the stem movement is externally visible, which makes visual position confirmation possible.<\/p>\n<h3 data-section-id=\"ynyxry\" data-start=\"7921\" data-end=\"7929\"><span class=\"ez-toc-section\" id=\"Yoke\"><\/span>Yoke<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"7930\" data-end=\"8005\">The yoke supports the upper operating assembly and helps guide stem motion.<\/p>\n<h3 data-section-id=\"77pr7a\" data-start=\"8007\" data-end=\"8016\"><span class=\"ez-toc-section\" id=\"Seats\"><\/span>Seats<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"8017\" data-end=\"8177\">The seats form the sealing interface with the gate. Seat design and material selection directly affect shut-off performance, wear life, and service suitability.<\/p>\n<h3 data-section-id=\"1r6rius\" data-start=\"8179\" data-end=\"8200\"><span class=\"ez-toc-section\" id=\"Packing_and_Gland\"><\/span>Packing and Gland<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"8201\" data-end=\"8374\">Packing seals around the stem as it passes through the bonnet area. Packing adjustment is important: too tight increases operating torque, while too loose may allow leakage.<\/p>\n<h3 data-section-id=\"17sk7g0\" data-start=\"8376\" data-end=\"8400\"><span class=\"ez-toc-section\" id=\"Operator_or_Actuator\"><\/span>Operator or Actuator<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"8401\" data-end=\"8432\">OS&amp;Y valves may be operated by:<\/p>\n<ul data-start=\"8433\" data-end=\"8522\">\n<li data-section-id=\"3l3k60\" data-start=\"8433\" data-end=\"8444\">handwheel<\/li>\n<li data-section-id=\"3p0v09\" data-start=\"8445\" data-end=\"8460\">gear operator<\/li>\n<li data-section-id=\"1us2s0w\" data-start=\"8461\" data-end=\"8480\">electric actuator<\/li>\n<li data-section-id=\"1h9ykan\" data-start=\"8481\" data-end=\"8501\">pneumatic actuator<\/li>\n<li data-section-id=\"8ptrti\" data-start=\"8502\" data-end=\"8522\">hydraulic actuator<\/li>\n<\/ul>\n<p data-start=\"8524\" data-end=\"8734\">For selection and maintenance, the most critical components are usually the <strong data-start=\"8600\" data-end=\"8647\">stem, packing, seats, and operator assembly<\/strong>, because these directly affect visibility, shut-off reliability, and operating torque.<\/p>\n<figure id=\"attachment_8636\" aria-describedby=\"caption-attachment-8636\" style=\"width: 1024px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-8636\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-structure-components-diagram.png\" alt=\"OS&amp;Y valve structure diagram with labeled components including stem yoke bonnet gate body and seat\" width=\"1024\" height=\"1024\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-structure-components-diagram.png 1024w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-structure-components-diagram-768x768.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-structure-components-diagram-12x12.png 12w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-structure-components-diagram-300x300.png 300w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-structure-components-diagram-600x600.png 600w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-structure-components-diagram-100x100.png 100w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption id=\"caption-attachment-8636\" class=\"wp-caption-text\">Main components of an OS&amp;Y valve with labeled structure<\/figcaption><\/figure>\n<hr data-start=\"9230\" data-end=\"9233\" \/>\n<h2 data-section-id=\"q3qgzq\" data-start=\"9235\" data-end=\"9273\"><span class=\"ez-toc-section\" id=\"OS_Y_Valve_vs_Non-Rising_Stem_Valve\"><\/span>OS&amp;Y Valve vs Non-Rising Stem Valve<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"9275\" data-end=\"9417\">One of the most important comparison questions in selection is the difference between an <strong data-start=\"9364\" data-end=\"9378\">OS&amp;Y valve<\/strong> and a <strong data-start=\"9385\" data-end=\"9416\">non-rising stem (NRS) valve<\/strong>.<\/p>\n<h3 data-section-id=\"h0omm9\" data-start=\"9419\" data-end=\"9439\"><span class=\"ez-toc-section\" id=\"Comparison_Table\"><\/span>Comparison Table<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"TyagGW_tableContainer\">\n<div class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"9441\" data-end=\"9871\" data-extentions-extra-tablecapture-id=\"440107\">\n<thead data-start=\"9441\" data-end=\"9489\">\n<tr data-start=\"9441\" data-end=\"9489\">\n<th class=\"\" data-start=\"9441\" data-end=\"9451\" data-col-size=\"md\">Feature<\/th>\n<th class=\"\" data-start=\"9451\" data-end=\"9464\" data-col-size=\"sm\">OS&amp;Y Valve<\/th>\n<th class=\"\" data-start=\"9464\" data-end=\"9489\" data-col-size=\"md\">Non-Rising Stem Valve<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"9504\" data-end=\"9871\">\n<tr data-start=\"9504\" data-end=\"9540\">\n<td data-start=\"9504\" data-end=\"9528\" data-col-size=\"md\">Stem movement visible<\/td>\n<td data-start=\"9528\" data-end=\"9534\" data-col-size=\"sm\">Yes<\/td>\n<td data-start=\"9534\" data-end=\"9540\" data-col-size=\"md\">No<\/td>\n<\/tr>\n<tr data-start=\"9541\" data-end=\"9593\">\n<td data-start=\"9541\" data-end=\"9570\" data-col-size=\"md\">Easy visual position check<\/td>\n<td data-start=\"9570\" data-end=\"9582\" data-col-size=\"sm\">Excellent<\/td>\n<td data-start=\"9582\" data-end=\"9593\" data-col-size=\"md\">Limited<\/td>\n<\/tr>\n<tr data-start=\"9594\" data-end=\"9643\">\n<td data-start=\"9594\" data-end=\"9625\" data-col-size=\"md\">Installation height required<\/td>\n<td data-start=\"9625\" data-end=\"9634\" data-col-size=\"sm\">Higher<\/td>\n<td data-start=\"9634\" data-end=\"9643\" data-col-size=\"md\">Lower<\/td>\n<\/tr>\n<tr data-start=\"9644\" data-end=\"9683\">\n<td data-start=\"9644\" data-end=\"9671\" data-col-size=\"md\">External thread exposure<\/td>\n<td data-start=\"9671\" data-end=\"9677\" data-col-size=\"sm\">Yes<\/td>\n<td data-start=\"9677\" data-end=\"9683\" data-col-size=\"md\">No<\/td>\n<\/tr>\n<tr data-start=\"9684\" data-end=\"9766\">\n<td data-start=\"9684\" data-end=\"9709\" data-col-size=\"md\">Inspection convenience<\/td>\n<td data-start=\"9709\" data-end=\"9742\" data-col-size=\"sm\">Better for quick visual checks<\/td>\n<td data-start=\"9742\" data-end=\"9766\" data-col-size=\"md\">Lower visual clarity<\/td>\n<\/tr>\n<tr data-start=\"9767\" data-end=\"9871\">\n<td data-start=\"9767\" data-end=\"9812\" data-col-size=\"md\">Common in visibility-critical applications<\/td>\n<td data-start=\"9812\" data-end=\"9826\" data-col-size=\"sm\">Very common<\/td>\n<td data-start=\"9826\" data-end=\"9871\" data-col-size=\"md\">Depends on design and project requirement<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<h3 data-section-id=\"pktfrq\" data-start=\"9873\" data-end=\"9898\"><span class=\"ez-toc-section\" id=\"NTGD_Engineering_Data\"><\/span>NTGD Engineering Data<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"9899\" data-end=\"10242\">In NTGD OS&amp;Y projects, full-open confirmation should be based on <strong data-start=\"9964\" data-end=\"9988\">verified stem travel<\/strong>, not on visual assumption alone. For larger sizes, the visible stem rise is typically substantial enough to support fast field identification, but dimensional confirmation should always follow the approved drawing, valve design, and project requirement.<\/p>\n<p data-start=\"10244\" data-end=\"10418\">For retrofit layouts or pump room applications, <strong data-start=\"10292\" data-end=\"10356\">installation clearance above the valve must be checked early<\/strong>, because rising stem travel directly affects available space.<\/p>\n<h3 data-section-id=\"1nw4i5z\" data-start=\"10420\" data-end=\"10443\"><span class=\"ez-toc-section\" id=\"When_to_Choose_OS_Y\"><\/span>When to Choose OS&amp;Y<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"10444\" data-end=\"10485\">OS&amp;Y valves are typically preferred when:<\/p>\n<ul data-start=\"10486\" data-end=\"10704\">\n<li data-section-id=\"1pxds1o\" data-start=\"10486\" data-end=\"10533\">visible open\/closed confirmation is important<\/li>\n<li data-section-id=\"1dobb95\" data-start=\"10534\" data-end=\"10560\">inspection speed matters<\/li>\n<li data-section-id=\"nqvors\" data-start=\"10561\" data-end=\"10605\">maintenance teams need clear visual status<\/li>\n<li data-section-id=\"1xc256w\" data-start=\"10606\" data-end=\"10640\">installation height is available<\/li>\n<li data-section-id=\"n14udf\" data-start=\"10641\" data-end=\"10704\">shut-off service is more important than compact space savings<\/li>\n<\/ul>\n<p data-start=\"10706\" data-end=\"10807\">See NTGD OS&amp;Y dimensional drawings and datasheets for full travel and installation clearance details.<\/p>\n<h3 data-section-id=\"1f5qar4\" data-start=\"10809\" data-end=\"10855\"><span class=\"ez-toc-section\" id=\"When_a_Non-Rising_Stem_Valve_May_Be_Chosen\"><\/span>When a Non-Rising Stem Valve May Be Chosen<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"10856\" data-end=\"10905\">Non-rising stem valves may be more suitable when:<\/p>\n<ul data-start=\"10906\" data-end=\"11071\">\n<li data-section-id=\"z4plx\" data-start=\"10906\" data-end=\"10938\">installation height is limited<\/li>\n<li data-section-id=\"1vhyfx\" data-start=\"10939\" data-end=\"10978\">the valve is placed in tighter spaces<\/li>\n<li data-section-id=\"1fbzyla\" data-start=\"10979\" data-end=\"11018\">external stem travel is not practical<\/li>\n<li data-section-id=\"f2fyar\" data-start=\"11019\" data-end=\"11071\">the project does not require visible stem movement<\/li>\n<\/ul>\n<p data-start=\"11073\" data-end=\"11183\">For a full engineering breakdown, read our complete guide to <a href=\"https:\/\/ntgdvalve.com\/rising-stem-gate-valve-vs-non-rising-stem-gate-valve\/\">Rising Stem vs Non-Rising Stem Gate Valves<\/a>.<\/p>\n<figure id=\"attachment_8638\" aria-describedby=\"caption-attachment-8638\" style=\"width: 1024px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8638\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-stem-travel-full-vs-partial.png\" alt=\"OS&amp;Y valve open vs closed diagram showing stem up open position and stem down closed position with flow direction\" width=\"1024\" height=\"1024\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-stem-travel-full-vs-partial.png 1024w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-stem-travel-full-vs-partial-768x768.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-stem-travel-full-vs-partial-12x12.png 12w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-stem-travel-full-vs-partial-300x300.png 300w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-stem-travel-full-vs-partial-600x600.png 600w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/osy-valve-stem-travel-full-vs-partial-100x100.png 100w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption id=\"caption-attachment-8638\" class=\"wp-caption-text\">Quick visual guide to identify OS&amp;Y valve open and closed positions<\/figcaption><\/figure>\n<hr data-start=\"11612\" data-end=\"11615\" \/>\n<h2 data-section-id=\"1gs29sb\" data-start=\"11617\" data-end=\"11678\"><span class=\"ez-toc-section\" id=\"OS_Y_Valve_Technical_Specifications_and_Selection_Criteria\"><\/span>OS&amp;Y Valve Technical Specifications and Selection Criteria<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"11680\" data-end=\"11926\">For engineers, contractors, and procurement teams, identifying valve position is only the first step. The next step is confirming whether the valve matches the pressure class, medium, standards, installation conditions, and project documentation.<\/p>\n<h3 data-section-id=\"1d0j86n\" data-start=\"11928\" data-end=\"11958\"><span class=\"ez-toc-section\" id=\"Typical_Selection_Criteria\"><\/span>Typical Selection Criteria<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"TyagGW_tableContainer\">\n<div class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"11960\" data-end=\"12935\" data-extentions-extra-tablecapture-id=\"760047\">\n<thead data-start=\"11960\" data-end=\"12011\">\n<tr data-start=\"11960\" data-end=\"12011\">\n<th class=\"\" data-start=\"11960\" data-end=\"11967\" data-col-size=\"sm\">Item<\/th>\n<th class=\"\" data-start=\"11967\" data-end=\"11984\" data-col-size=\"md\">Common Options<\/th>\n<th class=\"\" data-start=\"11984\" data-end=\"12011\" data-col-size=\"md\">Typical Note \/ Standard<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"12026\" data-end=\"12935\">\n<tr data-start=\"12026\" data-end=\"12088\">\n<td data-start=\"12026\" data-end=\"12039\" data-col-size=\"sm\">Valve Type<\/td>\n<td data-start=\"12039\" data-end=\"12057\" data-col-size=\"md\">OS&amp;Y gate valve<\/td>\n<td data-start=\"12057\" data-end=\"12088\" data-col-size=\"md\">Rising stem shut-off design<\/td>\n<\/tr>\n<tr data-start=\"12089\" data-end=\"12154\">\n<td data-start=\"12089\" data-end=\"12102\" data-col-size=\"sm\">Size Range<\/td>\n<td data-start=\"12102\" data-end=\"12115\" data-col-size=\"md\">1\/2&#8243; \u2013 48&#8243;<\/td>\n<td data-start=\"12115\" data-end=\"12154\" data-col-size=\"md\">Standard and custom sizes available<\/td>\n<\/tr>\n<tr data-start=\"12155\" data-end=\"12264\">\n<td data-start=\"12155\" data-end=\"12172\" data-col-size=\"sm\">Pressure Class<\/td>\n<td data-start=\"12172\" data-end=\"12216\" data-col-size=\"md\">Class 150 \/ 300 \/ 600 \/ 900 \/ 1500 \/ 2500<\/td>\n<td data-start=\"12216\" data-end=\"12264\" data-col-size=\"md\">Depends on design code and service condition<\/td>\n<\/tr>\n<tr data-start=\"12265\" data-end=\"12409\">\n<td data-start=\"12265\" data-end=\"12282\" data-col-size=\"sm\">Body Materials<\/td>\n<td data-start=\"12282\" data-end=\"12339\" data-col-size=\"md\">Ductile iron \/ WCB \/ stainless steel \/ alloy materials<\/td>\n<td data-start=\"12339\" data-end=\"12409\" data-col-size=\"md\">Material depends on medium, temperature, and corrosion requirement<\/td>\n<\/tr>\n<tr data-start=\"12410\" data-end=\"12533\">\n<td data-start=\"12410\" data-end=\"12427\" data-col-size=\"sm\">End Connection<\/td>\n<td data-start=\"12427\" data-end=\"12470\" data-col-size=\"md\">Flanged \/ grooved \/ threaded \/ butt-weld<\/td>\n<td data-start=\"12470\" data-end=\"12533\" data-col-size=\"md\">Connection standard must match project piping specification<\/td>\n<\/tr>\n<tr data-start=\"12534\" data-end=\"12666\">\n<td data-start=\"12534\" data-end=\"12546\" data-col-size=\"sm\">Operation<\/td>\n<td data-start=\"12546\" data-end=\"12600\" data-col-size=\"md\">Handwheel \/ gear \/ electric \/ pneumatic \/ hydraulic<\/td>\n<td data-start=\"12600\" data-end=\"12666\" data-col-size=\"md\">Selected based on torque, control method, and access condition<\/td>\n<\/tr>\n<tr data-start=\"12667\" data-end=\"12773\">\n<td data-start=\"12667\" data-end=\"12677\" data-col-size=\"sm\">Service<\/td>\n<td data-start=\"12677\" data-end=\"12733\" data-col-size=\"md\">Fire protection \/ water service \/ industrial shut-off<\/td>\n<td data-start=\"12733\" data-end=\"12773\" data-col-size=\"md\">OS&amp;Y is primarily for isolation duty<\/td>\n<\/tr>\n<tr data-start=\"12774\" data-end=\"12935\">\n<td data-start=\"12774\" data-end=\"12797\" data-col-size=\"sm\">Compliance Standards<\/td>\n<td data-start=\"12797\" data-end=\"12875\" data-col-size=\"md\"><a href=\"https:\/\/www.api.org\" target=\"_blank\" rel=\"noopener\">API 600<\/a> \/<a href=\"https:\/\/www.asme.org\" target=\"_blank\" rel=\"noopener\">ASME B16.34<\/a> \/project-specific AWWA \/ FM \/ UL \/ NFPA requirements<\/td>\n<td data-start=\"12875\" data-end=\"12935\" data-col-size=\"md\">Standards must match application and certification scope<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"12937\" data-end=\"13141\"><strong data-start=\"12937\" data-end=\"13141\">NTGD OS&amp;Y valves can be specified to align with <a href=\"https:\/\/ntgdvalve.com\/api-600-gate-valve\/\">API 600<\/a>, ASME B16.34, and project-driven fire protection or industrial shut-off requirements, subject to the exact valve design and certification scope.<\/strong><\/p>\n<h3 data-section-id=\"w4fp11\" data-start=\"13143\" data-end=\"13177\"><span class=\"ez-toc-section\" id=\"Key_Questions_Before_Selection\"><\/span>Key Questions Before Selection<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"13178\" data-end=\"13235\">Before selecting an OS&amp;Y valve, engineers should confirm:<\/p>\n<ul data-start=\"13237\" data-end=\"13832\">\n<li data-section-id=\"1n5vrkq\" data-start=\"13237\" data-end=\"13271\">What is the required valve size?<\/li>\n<li data-section-id=\"13pm955\" data-start=\"13272\" data-end=\"13321\">What is the design pressure and pressure class?<\/li>\n<li data-section-id=\"henqn9\" data-start=\"13322\" data-end=\"13358\">What medium will the valve handle?<\/li>\n<li data-section-id=\"1sns56f\" data-start=\"13359\" data-end=\"13449\">Is the valve being used for shut-off only, or is throttling mistakenly being considered?<\/li>\n<li data-section-id=\"t5z1b7\" data-start=\"13450\" data-end=\"13494\">What body and trim materials are required?<\/li>\n<li data-section-id=\"100jni2\" data-start=\"13495\" data-end=\"13538\">What connection standard must be matched?<\/li>\n<li data-section-id=\"1lvfpuu\" data-start=\"13539\" data-end=\"13594\">Is visible valve position required during inspection?<\/li>\n<li data-section-id=\"1lvgi9h\" data-start=\"13595\" data-end=\"13702\">Is there enough vertical clearance for stem travel?<br data-start=\"13648\" data-end=\"13651\" \/><strong data-start=\"13653\" data-end=\"13702\">\u2192 Check NTGD OS&amp;Y dimensional drawing library<\/strong><\/li>\n<li data-section-id=\"ozdo1n\" data-start=\"13703\" data-end=\"13788\">Does the project require FM\/UL, NFPA, API, ASME, or other compliance documentation?<\/li>\n<li data-section-id=\"1f998ht\" data-start=\"13789\" data-end=\"13832\">Is manual or actuated operation required?<\/li>\n<\/ul>\n<h3 data-section-id=\"1bdybyz\" data-start=\"13834\" data-end=\"13862\"><span class=\"ez-toc-section\" id=\"Practical_Selection_Rule\"><\/span>Practical Selection Rule<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"13863\" data-end=\"14030\">Choose an OS&amp;Y valve when <strong data-start=\"13889\" data-end=\"14029\">visible position indication, shut-off reliability, and inspection clarity are more important than minimizing vertical installation space<\/strong>.<\/p>\n<p data-start=\"14032\" data-end=\"14225\"><strong data-start=\"14032\" data-end=\"14050\">Ready to spec? Jump to the <a href=\"https:\/\/ntgdvalve.com\/osy-gate-valve\/\">NTGD OS&amp;Y product catalog<\/a>, dimensional drawing library, and technical datasheets for size range, stem travel, pressure rating, and project compliance details.<\/strong><\/p>\n<hr data-start=\"14227\" data-end=\"14230\" \/>\n<h2 data-section-id=\"j6l35c\" data-start=\"14232\" data-end=\"14275\"><span class=\"ez-toc-section\" id=\"Typical_Applications_of_OS_Y_Gate_Valves\"><\/span>Typical Applications of OS&amp;Y Gate Valves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"14277\" data-end=\"14420\">OS&amp;Y gate valves are commonly used where <strong data-start=\"14318\" data-end=\"14354\">clear open\/closed identification<\/strong> and <strong data-start=\"14359\" data-end=\"14380\">reliable shut-off<\/strong> are more important than compact height.<\/p>\n<h3 data-section-id=\"xx0hya\" data-start=\"14422\" data-end=\"14445\"><span class=\"ez-toc-section\" id=\"Common_Applications\"><\/span>Common Applications<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul data-start=\"14446\" data-end=\"14662\">\n<li data-section-id=\"1uv9xyd\" data-start=\"14446\" data-end=\"14471\">fire protection systems<\/li>\n<li data-section-id=\"odibw4\" data-start=\"14472\" data-end=\"14497\">sprinkler control lines<\/li>\n<li data-section-id=\"15v2nkh\" data-start=\"14498\" data-end=\"14526\">water distribution systems<\/li>\n<li data-section-id=\"se0l7y\" data-start=\"14527\" data-end=\"14552\">pump room valve layouts<\/li>\n<li data-section-id=\"tn4vhm\" data-start=\"14553\" data-end=\"14588\">industrial utility shut-off lines<\/li>\n<li data-section-id=\"1crnc37\" data-start=\"14589\" data-end=\"14629\">oil and gas auxiliary shut-off service<\/li>\n<li data-section-id=\"vnpd2l\" data-start=\"14630\" data-end=\"14662\">general process isolation duty<\/li>\n<\/ul>\n<h3 data-section-id=\"9x236m\" data-start=\"14664\" data-end=\"14687\"><span class=\"ez-toc-section\" id=\"Fire_Protection_Use\"><\/span>Fire Protection Use<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"14688\" data-end=\"14854\">OS&amp;Y valves are widely used in fire protection-related systems because a visible rising stem makes valve status easier to verify during inspection and routine checks aligned with<br \/>\n<a href=\"https:\/\/www.nfpa.org\" target=\"_blank\" rel=\"noopener\">NFPA standards<\/a>.<\/p>\n<p data-start=\"14856\" data-end=\"15039\">For projects requiring visible shut-off status in fire protection systems, view NTGD\u2019s full range of <a href=\"https:\/\/ntgdvalve.com\/osy-gate-valve\/\">OS&amp;Y fire protection gate valves<\/a> and project support resources.<\/p>\n<h3 data-section-id=\"w5ql8i\" data-start=\"15041\" data-end=\"15059\"><span class=\"ez-toc-section\" id=\"Industrial_Use\"><\/span>Industrial Use<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"15060\" data-end=\"15225\">In industrial systems, OS&amp;Y valves are commonly selected for shut-off service where a simple visual indication of stem travel adds value to inspection and operation.<\/p>\n<h3 data-section-id=\"15sa0v8\" data-start=\"15227\" data-end=\"15251\"><span class=\"ez-toc-section\" id=\"Application_Boundary\"><\/span>Application Boundary<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"15252\" data-end=\"15435\">OS&amp;Y valves are primarily <strong data-start=\"15278\" data-end=\"15298\">isolation valves<\/strong>. They should not be positioned as throttling valves. If regulated flow control is required, another valve type is usually more suitable.<\/p>\n<hr data-start=\"15437\" data-end=\"15440\" \/>\n<h2 data-section-id=\"1amnj2e\" data-start=\"15442\" data-end=\"15506\"><span class=\"ez-toc-section\" id=\"NTGD_Engineering_Insight_Common_OS_Y_Issues_in_Real_Projects\"><\/span>NTGD Engineering Insight: Common OS&amp;Y Issues in Real Projects<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"15508\" data-end=\"15787\">This section is intended to go beyond textbook explanation. In real projects, OS&amp;Y valve problems are usually caused by <strong data-start=\"15628\" data-end=\"15786\">incorrect installation assumptions, incomplete travel verification, poor maintenance practice, wrong application matching, or overlooked space constraints<\/strong>.<\/p>\n<h3 data-section-id=\"1xngghz\" data-start=\"15789\" data-end=\"15822\"><span class=\"ez-toc-section\" id=\"1_Misreading_Valve_Condition\"><\/span>1. Misreading Valve Condition<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"15823\" data-end=\"15938\">A raised stem is useful, but operators can still misjudge a valve if they assume any visible rise means fully open.<\/p>\n<p data-start=\"15940\" data-end=\"16214\"><strong data-start=\"15940\" data-end=\"15960\">NTGD Field Note:<\/strong> In visibility-critical systems, the most common inspection mistake is assuming partial stem rise equals full-open position. This usually happens after commissioning or maintenance when the valve has not been checked against actual full-travel condition.<\/p>\n<p data-start=\"16216\" data-end=\"16465\"><strong data-start=\"16216\" data-end=\"16240\">NTGD Recommendation:<\/strong> During handover and routine inspection, confirm full-open position against the approved travel condition, not just by a quick visual guess. Where practical, mark or record the verified full-open position for field reference.<\/p>\n<h3 data-section-id=\"gdt92k\" data-start=\"16467\" data-end=\"16503\"><span class=\"ez-toc-section\" id=\"2_Excessive_Packing_Compression\"><\/span>2. Excessive Packing Compression<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"16504\" data-end=\"16645\">Packing that is tightened too aggressively may reduce leakage temporarily, but it often increases operating torque and accelerates stem wear.<\/p>\n<p data-start=\"16647\" data-end=\"16849\"><strong data-start=\"16647\" data-end=\"16667\">NTGD Field Note:<\/strong> Over-tightened packing is one of the most common causes of \u201chard to operate\u201d complaints on otherwise serviceable valves. The issue is often created in the field, not in the factory.<\/p>\n<p data-start=\"16851\" data-end=\"17041\"><strong data-start=\"16851\" data-end=\"16875\">NTGD Recommendation:<\/strong> Tighten packing only enough to maintain sealing. If operating torque rises sharply after adjustment, stop and recheck gland compression instead of forcing operation.<\/p>\n<h3 data-section-id=\"16pxhd7\" data-start=\"17043\" data-end=\"17078\"><span class=\"ez-toc-section\" id=\"3_Lack_of_Full-Stroke_Exercise\"><\/span>3. Lack of Full-Stroke Exercise<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"17079\" data-end=\"17226\">Valves that stay in one position for long periods can become harder to operate if they are never exercised under controlled maintenance procedures.<\/p>\n<p data-start=\"17228\" data-end=\"17393\"><strong data-start=\"17228\" data-end=\"17248\">NTGD Field Note:<\/strong> In pump rooms and industrial utility lines, long static periods increase the chance that a valve will be difficult to move when urgently needed.<\/p>\n<p data-start=\"17395\" data-end=\"17554\"><strong data-start=\"17395\" data-end=\"17419\">NTGD Recommendation:<\/strong> Include periodic functional checks and controlled full-stroke operation where permitted by maintenance procedure and system condition.<\/p>\n<h3 data-section-id=\"b7ud9f\" data-start=\"17556\" data-end=\"17597\"><span class=\"ez-toc-section\" id=\"4_Wrong_Valve_Choice_for_the_Service\"><\/span>4. Wrong Valve Choice for the Service<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"17598\" data-end=\"17749\">Some buyers search for \u201cOS&amp;Y valve\u201d and assume it is automatically suitable for any gate-valve-like application. That is not the right selection logic.<\/p>\n<p data-start=\"17751\" data-end=\"17988\"><strong data-start=\"17751\" data-end=\"17771\">NTGD Field Note:<\/strong> OS&amp;Y is a structural configuration, not a universal service answer. The right choice still depends on medium, pressure class, required standards, installation space, and whether shut-off duty is the real requirement.<\/p>\n<p data-start=\"17990\" data-end=\"18142\"><strong data-start=\"17990\" data-end=\"18014\">NTGD Recommendation:<\/strong> Verify medium, pressure, temperature, shut-off duty, compliance requirement, and operating method before final model selection.<\/p>\n<h3 data-section-id=\"174bvcp\" data-start=\"18144\" data-end=\"18184\"><span class=\"ez-toc-section\" id=\"5_Installation_Clearance_Overlooked\"><\/span>5. Installation Clearance Overlooked<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"18185\" data-end=\"18366\">Because the stem rises during operation, OS&amp;Y valves need overhead space. This becomes a common issue in retrofit pump rooms, compact mechanical areas, and congested piping layouts.<\/p>\n<p data-start=\"18368\" data-end=\"18513\"><strong data-start=\"18368\" data-end=\"18388\">NTGD Field Note:<\/strong> Clearance problems are often discovered too late, after installation space has already been fixed by the surrounding layout.<\/p>\n<p data-start=\"18515\" data-end=\"18662\"><strong data-start=\"18515\" data-end=\"18539\">NTGD Recommendation:<\/strong> Review maximum stem rise and dimensional drawing before order approval, especially for retrofits or tight equipment rooms.<\/p>\n<h3 data-section-id=\"1hpm0ow\" data-start=\"18664\" data-end=\"18724\"><span class=\"ez-toc-section\" id=\"6_Fire_Protection_System_Freeze_or_Low-Temperature_Risk\"><\/span>6. Fire Protection System Freeze or Low-Temperature Risk<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"18725\" data-end=\"18897\">In cold environments, valves in fire protection-related service may face additional maintenance risk if local freeze protection and operating conditions are not considered.<\/p>\n<p data-start=\"18899\" data-end=\"19062\"><strong data-start=\"18899\" data-end=\"18919\">NTGD Field Note:<\/strong> Low-temperature exposure changes how operators should think about inspection frequency, drainage condition, and surrounding system protection.<\/p>\n<p data-start=\"19064\" data-end=\"19252\"><strong data-start=\"19064\" data-end=\"19088\">NTGD Recommendation:<\/strong> For cold-region projects, confirm valve material suitability, insulation or enclosure requirement, and maintenance procedure as part of project engineering review.<\/p>\n<figure id=\"attachment_8641\" aria-describedby=\"caption-attachment-8641\" style=\"width: 1707px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8641\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/large-osy-gate-valve-factory-inspection-scaled.jpg\" alt=\"large OS&amp;Y gate valve inspection in factory with technician checking valve body and stem condition\" width=\"1707\" height=\"2560\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/large-osy-gate-valve-factory-inspection-scaled.jpg 1707w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/large-osy-gate-valve-factory-inspection-768x1152.jpg 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/large-osy-gate-valve-factory-inspection-1024x1536.jpg 1024w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/large-osy-gate-valve-factory-inspection-1365x2048.jpg 1365w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/large-osy-gate-valve-factory-inspection-8x12.jpg 8w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/large-osy-gate-valve-factory-inspection-600x900.jpg 600w\" sizes=\"(max-width: 1707px) 100vw, 1707px\" \/><figcaption id=\"caption-attachment-8641\" class=\"wp-caption-text\">On-site inspection of a large OS&amp;Y valve for condition verification<\/figcaption><\/figure>\n<hr data-start=\"19254\" data-end=\"19257\" \/>\n<h2 data-section-id=\"wylwgs\" data-start=\"19259\" data-end=\"19303\"><span class=\"ez-toc-section\" id=\"Advantages_and_Limitations_of_OS_Y_Valves\"><\/span>Advantages and Limitations of OS&amp;Y Valves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-section-id=\"1l3n95q\" data-start=\"19305\" data-end=\"19319\"><span class=\"ez-toc-section\" id=\"Advantages\"><\/span>Advantages<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"19320\" data-end=\"19367\">OS&amp;Y valves provide several practical benefits:<\/p>\n<ul data-start=\"19369\" data-end=\"19618\">\n<li data-section-id=\"1bld150\" data-start=\"19369\" data-end=\"19410\">clear visual indication of valve status<\/li>\n<li data-section-id=\"18kbumb\" data-start=\"19411\" data-end=\"19462\">reliable shut-off service when correctly selected<\/li>\n<li data-section-id=\"ul10m3\" data-start=\"19463\" data-end=\"19500\">useful for inspection-based systems<\/li>\n<li data-section-id=\"iilht4\" data-start=\"19501\" data-end=\"19548\">compatible with manual or automated operation<\/li>\n<li data-section-id=\"xtrc89\" data-start=\"19549\" data-end=\"19618\">well suited to applications where visible position feedback matters<\/li>\n<\/ul>\n<h3 data-section-id=\"chrobh\" data-start=\"19620\" data-end=\"19635\"><span class=\"ez-toc-section\" id=\"Limitations\"><\/span>Limitations<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"19636\" data-end=\"19673\">They also have practical limitations:<\/p>\n<ul data-start=\"19675\" data-end=\"19947\">\n<li data-section-id=\"oy1256\" data-start=\"19675\" data-end=\"19717\">require more vertical installation space<\/li>\n<li data-section-id=\"1len212\" data-start=\"19718\" data-end=\"19752\">not suitable for throttling duty<\/li>\n<li data-section-id=\"44kp95\" data-start=\"19753\" data-end=\"19815\">external stem area and packing require maintenance attention<\/li>\n<li data-section-id=\"p0a0m8\" data-start=\"19816\" data-end=\"19872\">wrong packing adjustment can increase operating torque<\/li>\n<li data-section-id=\"1gzj5si\" data-start=\"19873\" data-end=\"19947\">application suitability still depends on pressure, medium, and standards<\/li>\n<\/ul>\n<h3 data-section-id=\"17j00o0\" data-start=\"19949\" data-end=\"19971\"><span class=\"ez-toc-section\" id=\"Practical_Takeaway\"><\/span>Practical Takeaway<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"19972\" data-end=\"20144\">The real value of an OS&amp;Y valve is not just that it opens and closes, but that it combines shut-off duty with <strong data-start=\"20082\" data-end=\"20111\">visible position feedback<\/strong> for inspection-critical systems.<\/p>\n<hr data-start=\"20146\" data-end=\"20149\" \/>\n<h2 data-section-id=\"codcf7\" data-start=\"20151\" data-end=\"20195\"><span class=\"ez-toc-section\" id=\"OS_Y_Valve_Inspection_and_Troubleshooting\"><\/span>OS&amp;Y Valve Inspection and Troubleshooting<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"20197\" data-end=\"20308\">A useful troubleshooting section should connect the symptom to the likely cause and the next corrective action.<\/p>\n<h3 data-section-id=\"vte0tk\" data-start=\"20310\" data-end=\"20338\"><span class=\"ez-toc-section\" id=\"Valve_Is_Hard_to_Operate\"><\/span>Valve Is Hard to Operate<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"20339\" data-end=\"20355\">Possible causes:<\/p>\n<ul data-start=\"20356\" data-end=\"20478\">\n<li data-section-id=\"1hzgzk3\" data-start=\"20356\" data-end=\"20381\">packing gland too tight<\/li>\n<li data-section-id=\"nb7uql\" data-start=\"20382\" data-end=\"20409\">lack of periodic exercise<\/li>\n<li data-section-id=\"9v6zvl\" data-start=\"20410\" data-end=\"20440\">internal obstruction or wear<\/li>\n<li data-section-id=\"1ybygwe\" data-start=\"20441\" data-end=\"20478\">stem condition or lubrication issue<\/li>\n<\/ul>\n<p data-start=\"20480\" data-end=\"20499\">Recommended action:<\/p>\n<ul data-start=\"20500\" data-end=\"20648\">\n<li data-section-id=\"98pl1k\" data-start=\"20500\" data-end=\"20528\">inspect packing adjustment<\/li>\n<li data-section-id=\"egapdy\" data-start=\"20529\" data-end=\"20554\">review exercise history<\/li>\n<li data-section-id=\"1nc2hq4\" data-start=\"20555\" data-end=\"20591\">inspect for mechanical obstruction<\/li>\n<li data-section-id=\"18cs0ek\" data-start=\"20592\" data-end=\"20648\">confirm the valve is being used in the correct service<\/li>\n<\/ul>\n<h3 data-section-id=\"1lrk3wk\" data-start=\"20650\" data-end=\"20682\"><span class=\"ez-toc-section\" id=\"Leakage_Around_the_Stem_Area\"><\/span>Leakage Around the Stem Area<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"20683\" data-end=\"20699\">Possible causes:<\/p>\n<ul data-start=\"20700\" data-end=\"20795\">\n<li data-section-id=\"voci6t\" data-start=\"20700\" data-end=\"20714\">worn packing<\/li>\n<li data-section-id=\"rnd5l2\" data-start=\"20715\" data-end=\"20746\">incorrect packing compression<\/li>\n<li data-section-id=\"1a3spar\" data-start=\"20747\" data-end=\"20766\">stem surface wear<\/li>\n<li data-section-id=\"fvme2s\" data-start=\"20767\" data-end=\"20795\">poor maintenance condition<\/li>\n<\/ul>\n<p data-start=\"20797\" data-end=\"20816\">Recommended action:<\/p>\n<ul data-start=\"20817\" data-end=\"20945\">\n<li data-section-id=\"1xjns3f\" data-start=\"20817\" data-end=\"20858\">inspect and replace packing as required<\/li>\n<li data-section-id=\"91o980\" data-start=\"20859\" data-end=\"20895\">adjust gland compression correctly<\/li>\n<li data-section-id=\"17ocq5z\" data-start=\"20896\" data-end=\"20945\">inspect stem condition before return to service<\/li>\n<\/ul>\n<h3 data-section-id=\"qgyi7j\" data-start=\"20947\" data-end=\"20976\"><span class=\"ez-toc-section\" id=\"Valve_Position_Is_Unclear\"><\/span>Valve Position Is Unclear<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"20977\" data-end=\"20993\">Possible causes:<\/p>\n<ul data-start=\"20994\" data-end=\"21107\">\n<li data-section-id=\"17ymwzi\" data-start=\"20994\" data-end=\"21013\">incomplete travel<\/li>\n<li data-section-id=\"1gj45ag\" data-start=\"21014\" data-end=\"21056\">operator assumption without verification<\/li>\n<li data-section-id=\"a6tl43\" data-start=\"21057\" data-end=\"21107\">actuator setup not aligned to actual full travel<\/li>\n<\/ul>\n<p data-start=\"21109\" data-end=\"21128\">Recommended action:<\/p>\n<ul data-start=\"21129\" data-end=\"21270\">\n<li data-section-id=\"1729va3\" data-start=\"21129\" data-end=\"21154\">verify full stem travel<\/li>\n<li data-section-id=\"sc3oq7\" data-start=\"21155\" data-end=\"21198\">inspect opening and closing stop settings<\/li>\n<li data-section-id=\"1336m45\" data-start=\"21199\" data-end=\"21270\">compare field position against approved drawing or maintenance record<\/li>\n<\/ul>\n<h3 data-section-id=\"1t777cg\" data-start=\"21272\" data-end=\"21311\"><span class=\"ez-toc-section\" id=\"Internal_Shut-Off_Is_Unsatisfactory\"><\/span>Internal Shut-Off Is Unsatisfactory<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"21312\" data-end=\"21328\">Possible causes:<\/p>\n<ul data-start=\"21329\" data-end=\"21457\">\n<li data-section-id=\"17avf28\" data-start=\"21329\" data-end=\"21348\">seat or gate wear<\/li>\n<li data-section-id=\"ho1rde\" data-start=\"21349\" data-end=\"21381\">debris at the sealing surfaces<\/li>\n<li data-section-id=\"1unl4uh\" data-start=\"21382\" data-end=\"21419\">wrong specification for the service<\/li>\n<li data-section-id=\"1i3jdk6\" data-start=\"21420\" data-end=\"21457\">damage caused by improper operation<\/li>\n<\/ul>\n<p data-start=\"21459\" data-end=\"21478\">Recommended action:<\/p>\n<ul data-start=\"21479\" data-end=\"21601\">\n<li data-section-id=\"1246qcj\" data-start=\"21479\" data-end=\"21505\">inspect sealing surfaces<\/li>\n<li data-section-id=\"1smar0p\" data-start=\"21506\" data-end=\"21537\">confirm service compatibility<\/li>\n<li data-section-id=\"1pa32yt\" data-start=\"21538\" data-end=\"21601\">verify whether the valve has been used for shut-off duty only<\/li>\n<\/ul>\n<p data-start=\"21603\" data-end=\"21770\">Download the <strong data-start=\"21616\" data-end=\"21674\">NTGD OS&amp;Y valve maintenance and troubleshooting manual<\/strong> for a step-by-step inspection checklist, common field issues, and engineering support guidance.<\/p>\n<figure id=\"attachment_8640\" aria-describedby=\"caption-attachment-8640\" style=\"width: 2560px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-8640\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/heavy-duty-osy-valve-manufacturing-lifting-process-scaled.jpg\" alt=\"heavy duty OS&amp;Y valve lifting process in factory showing large valve handling and assembly operation\" width=\"2560\" height=\"1707\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/heavy-duty-osy-valve-manufacturing-lifting-process-scaled.jpg 2560w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/heavy-duty-osy-valve-manufacturing-lifting-process-768x512.jpg 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/heavy-duty-osy-valve-manufacturing-lifting-process-1536x1024.jpg 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/heavy-duty-osy-valve-manufacturing-lifting-process-2048x1365.jpg 2048w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/heavy-duty-osy-valve-manufacturing-lifting-process-18x12.jpg 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/heavy-duty-osy-valve-manufacturing-lifting-process-600x400.jpg 600w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-8640\" class=\"wp-caption-text\">Handling and positioning of a heavy-duty OS&amp;Y valve during manufacturing<\/figcaption><\/figure>\n<hr data-start=\"21772\" data-end=\"21775\" \/>\n<h2 data-section-id=\"tpupqj\" data-start=\"21777\" data-end=\"21840\"><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions_OS_Y_Valve_Open_Position_More\"><\/span>Frequently Asked Questions (OS&amp;Y Valve Open Position &amp; More)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-section-id=\"3o9cor\" data-start=\"21842\" data-end=\"21887\"><span class=\"ez-toc-section\" id=\"An_OS_Y_valve_is_in_the_open_position_if\"><\/span>An OS&amp;Y valve is in the open position if?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"21888\" data-end=\"22065\">An OS&amp;Y valve is in the open position if the stem is raised and visibly protrudes above the handwheel or yoke. Stem up indicates the gate has been lifted into the open position.<\/p>\n<h3 data-section-id=\"1qdopcq\" data-start=\"22067\" data-end=\"22122\"><span class=\"ez-toc-section\" id=\"How_do_you_tell_if_an_OS_Y_valve_is_open_or_closed\"><\/span>How do you tell if an OS&amp;Y valve is open or closed?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"22123\" data-end=\"22338\">The fastest field check is the stem position. If the rising stem is up and clearly visible, the valve is open. If the stem is lowered, the valve is closed. Partial stem rise should not be assumed to mean fully open.<\/p>\n<h3 data-section-id=\"148ftx7\" data-start=\"22340\" data-end=\"22407\"><span class=\"ez-toc-section\" id=\"What_is_the_difference_between_OS_Y_and_non-rising_stem_valves\"><\/span>What is the difference between OS&amp;Y and non-rising stem valves?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"22408\" data-end=\"22617\">The main difference is visible stem travel. OS&amp;Y valves have an externally visible rising stem, while non-rising stem valves do not.<br data-start=\"22540\" data-end=\"22543\" \/>\u2192 See detailed comparison: <strong data-start=\"22570\" data-end=\"22617\">[Rising Stem vs Non-Rising Stem Gate Valve]<\/strong><\/p>\n<h3 data-section-id=\"1sv4m4i\" data-start=\"22619\" data-end=\"22654\"><span class=\"ez-toc-section\" id=\"What_does_OS_Y_mean_on_a_valve\"><\/span>What does OS&amp;Y mean on a valve?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"22655\" data-end=\"22811\">OS&amp;Y means <strong data-start=\"22666\" data-end=\"22692\">Outside Screw and Yoke<\/strong>. It refers to a valve design in which the stem thread is outside the valve body and stem travel is externally visible.<\/p>\n<h3 data-section-id=\"1fjqijc\" data-start=\"22813\" data-end=\"22838\"><span class=\"ez-toc-section\" id=\"What_is_a_valve_yoke\"><\/span>What is a valve yoke?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"22839\" data-end=\"22949\">A valve yoke is the external support frame that guides and supports the stem assembly and operating mechanism.<\/p>\n<h3 data-section-id=\"1ugzt56\" data-start=\"22951\" data-end=\"23033\"><span class=\"ez-toc-section\" id=\"Is_an_outside_screw_and_yoke_valve_in_the_open_position_if_the_stem_is_raised\"><\/span>Is an outside screw and yoke valve in the open position if the stem is raised?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"23034\" data-end=\"23223\">Yes. An outside screw and yoke valve is generally considered open when the rising stem is raised and visibly above the handwheel or yoke area. Full-travel verification is still recommended.<\/p>\n<h3 data-section-id=\"1qetr7a\" data-start=\"23225\" data-end=\"23299\"><span class=\"ez-toc-section\" id=\"What_does_%E2%80%9Can_OS_Y_valve_is_in_the_open_position_if%E2%80%9D_mean_in_practice\"><\/span>What does \u201can OS&amp;Y valve is in the open position if\u201d mean in practice?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"23300\" data-end=\"23444\">It means the stem must be fully raised and visibly above the yoke or handwheel area. Partial stem rise should not be assumed to mean fully open.<\/p>\n<h3 data-section-id=\"oj5pad\" data-start=\"23446\" data-end=\"23507\"><span class=\"ez-toc-section\" id=\"What_is_the_difference_between_OS_Y_valve_open_vs_closed\"><\/span>What is the difference between OS&amp;Y valve open vs closed?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"23508\" data-end=\"23693\">The difference is the visible stem position. In the open position, the stem is raised. In the closed position, the stem is lowered. This visual movement is the main operating indicator.<\/p>\n<h3 data-section-id=\"mun8ss\" data-start=\"23695\" data-end=\"23751\"><span class=\"ez-toc-section\" id=\"What_should_be_checked_during_OS_Y_valve_inspection\"><\/span>What should be checked during OS&amp;Y valve inspection?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"23752\" data-end=\"23776\">Inspectors should check:<\/p>\n<ul data-start=\"23777\" data-end=\"23990\">\n<li data-section-id=\"17w3u9q\" data-start=\"23777\" data-end=\"23792\">stem position<\/li>\n<li data-section-id=\"b8wuyl\" data-start=\"23793\" data-end=\"23816\">full-travel condition<\/li>\n<li data-section-id=\"bo2oy8\" data-start=\"23817\" data-end=\"23836\">stem area leakage<\/li>\n<li data-section-id=\"1j6qzeq\" data-start=\"23837\" data-end=\"23856\">packing condition<\/li>\n<li data-section-id=\"1ur0l6u\" data-start=\"23857\" data-end=\"23876\">ease of operation<\/li>\n<li data-section-id=\"1bxpe34\" data-start=\"23877\" data-end=\"23990\">general condition of the external operating assembly<br data-start=\"23931\" data-end=\"23934\" \/>\u2192 For maintenance support, contact <strong data-start=\"23969\" data-end=\"23989\">NTGD engineering<\/strong>.<\/li>\n<\/ul>\n<h3 data-section-id=\"rpftfs\" data-start=\"23992\" data-end=\"24049\"><span class=\"ez-toc-section\" id=\"Are_OS_Y_valves_required_for_fire_protection_systems\"><\/span>Are OS&amp;Y valves required for fire protection systems?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"24050\" data-end=\"24265\">That depends on the project code, specification, and approval requirement. In many fire protection-related applications, visible valve position is a major advantage, which is one reason OS&amp;Y designs are widely used.<\/p>\n<h3 data-section-id=\"bm4u01\" data-start=\"24267\" data-end=\"24313\"><span class=\"ez-toc-section\" id=\"Can_OS_Y_valves_be_installed_horizontally\"><\/span>Can OS&amp;Y valves be installed horizontally?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"24314\" data-end=\"24525\">That depends on the valve design, installation requirement, and project specification. Horizontal installation should always be checked against the approved drawing, service condition, and manufacturer guidance.<\/p>\n<h3 data-section-id=\"f102sb\" data-start=\"24527\" data-end=\"24573\"><span class=\"ez-toc-section\" id=\"How_often_should_OS_Y_valves_be_exercised\"><\/span>How often should OS&amp;Y valves be exercised?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"24574\" data-end=\"24803\">Exercise frequency depends on the system, maintenance procedure, and project requirement. In critical service, regular inspection and controlled functional checks are important to reduce the risk of seizure or misjudged position.<\/p>\n<p data-start=\"24574\" data-end=\"24803\"><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"An OS&Y valve is in the open position if?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"An OS&Y valve is in the open position if the stem is raised and visibly protrudes above the handwheel or yoke.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do you tell if an OS&Y valve is open or closed?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If the rising stem is up and clearly visible, the valve is open. If the stem is lowered, the valve is closed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between OS&Y and non-rising stem valves?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"OS&Y valves have a visible rising stem, while non-rising stem valves do not. The visible stem allows easier position identification.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does OS&Y mean on a valve?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"OS&Y means Outside Screw and Yoke, referring to a valve design with an externally visible rising stem.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is a valve yoke?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A valve yoke is the external frame that supports and guides the stem and operating mechanism.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is an outside screw and yoke valve in the open position if the stem is raised?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. If the stem is raised and visible, the valve is generally considered open, though full travel should be verified.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What does \\\"an OS&Y valve is in the open position if\\\" mean in practice?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"It means the stem must be fully raised and visible. Partial rise does not guarantee the valve is fully open.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between OS&Y valve open vs closed?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Open means the stem is raised. Closed means the stem is lowered. The stem position is the key indicator.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What should be checked during OS&Y valve inspection?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Check stem position, full travel, leakage, packing condition, and ease of operation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are OS&Y valves required for fire protection systems?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"That depends on project requirements, but visible valve position is a key reason they are widely used in fire systems.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can OS&Y valves be installed horizontally?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"It depends on valve design and project specifications. Always verify installation requirements before use.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How often should OS&Y valves be exercised?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Exercise frequency depends on system requirements, but periodic inspection and operation are recommended.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n<hr data-start=\"24805\" data-end=\"24808\" \/>\n<h2 data-section-id=\"48jipz\" data-start=\"24810\" data-end=\"24855\"><span class=\"ez-toc-section\" id=\"OS_Y_Valve_Engineering_Support_Resources\"><\/span>OS&amp;Y Valve Engineering Support &amp; Resources<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-section-id=\"f4xi8y\" data-start=\"24857\" data-end=\"24896\"><span class=\"ez-toc-section\" id=\"NTGD_Certifications_Trust_Signals\"><\/span>NTGD Certifications \/ Trust Signals<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"24897\" data-end=\"25073\">Depending on the exact project, valve design, and certification scope, NTGD can support customers with documentation and product configurations aligned to requirements such as:<\/p>\n<ul data-start=\"25075\" data-end=\"25237\">\n<li data-section-id=\"1qadegi\" data-start=\"25075\" data-end=\"25086\">UL Listed<\/li>\n<li data-section-id=\"165qwrs\" data-start=\"25087\" data-end=\"25100\">FM Approved<\/li>\n<li data-section-id=\"1q2ogsf\" data-start=\"25101\" data-end=\"25130\">AWWA compliant design basis<\/li>\n<li data-section-id=\"8yifm3\" data-start=\"25131\" data-end=\"25160\">ISO 9001 quality management<\/li>\n<li data-section-id=\"1dsivyx\" data-start=\"25161\" data-end=\"25194\">Material traceability available<\/li>\n<li data-section-id=\"kwr4kz\" data-start=\"25195\" data-end=\"25237\">technical datasheets and drawing support<\/li>\n<\/ul>\n<h3 data-section-id=\"lw5ybn\" data-start=\"25239\" data-end=\"25290\"><span class=\"ez-toc-section\" id=\"Free_Download_OS_Y_Valve_Quick_Reference_Guide\"><\/span>Free Download: OS&amp;Y Valve Quick Reference Guide<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"25291\" data-end=\"25331\">Get a quick-reference resource covering:<\/p>\n<ul data-start=\"25332\" data-end=\"25467\">\n<li data-section-id=\"1giy9ey\" data-start=\"25332\" data-end=\"25374\">OS&amp;Y valve open vs closed identification<\/li>\n<li data-section-id=\"oug4fp\" data-start=\"25375\" data-end=\"25405\">basic inspection checkpoints<\/li>\n<li data-section-id=\"gfwn79\" data-start=\"25406\" data-end=\"25427\">selection reminders<\/li>\n<li data-section-id=\"e3o9xd\" data-start=\"25428\" data-end=\"25467\">installation clearance considerations<\/li>\n<\/ul>\n<p data-start=\"25469\" data-end=\"25528\"><strong data-start=\"25469\" data-end=\"25528\">Fill in your name and email to get the guide instantly.<\/strong><\/p>\n<h3 data-section-id=\"19z3llw\" data-start=\"25530\" data-end=\"25568\"><span class=\"ez-toc-section\" id=\"Free_Engineering_Selection_Support\"><\/span>Free Engineering Selection Support<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"25569\" data-end=\"25709\">For fire protection, water system, or industrial shut-off projects, submit your parameters to receive a tailored engineering recommendation.<\/p>\n<p data-start=\"25711\" data-end=\"25737\"><strong data-start=\"25711\" data-end=\"25737\">Suggested form fields:<\/strong><\/p>\n<ul data-start=\"25738\" data-end=\"25854\">\n<li data-section-id=\"1j4dcvh\" data-start=\"25738\" data-end=\"25744\">Size<\/li>\n<li data-section-id=\"58tjsz\" data-start=\"25745\" data-end=\"25761\">Pressure Class<\/li>\n<li data-section-id=\"1thwjyt\" data-start=\"25762\" data-end=\"25770\">Medium<\/li>\n<li data-section-id=\"1jpn85o\" data-start=\"25771\" data-end=\"25815\">Project Type: Fire Protection \/ Industrial<\/li>\n<li data-section-id=\"13v5qp2\" data-start=\"25816\" data-end=\"25833\">Connection Type<\/li>\n<li data-section-id=\"bo6loz\" data-start=\"25834\" data-end=\"25844\">Quantity<\/li>\n<li data-section-id=\"61cl6o\" data-start=\"25845\" data-end=\"25854\">Country<\/li>\n<\/ul>\n<p data-start=\"25856\" data-end=\"25968\"><strong data-start=\"25856\" data-end=\"25968\">Fill out this 30-second form to receive a personalized OS&amp;Y valve spec sheet and engineering recommendation.<\/strong><\/p>\n<h3 data-section-id=\"1gpsl9n\" data-start=\"25970\" data-end=\"26017\"><span class=\"ez-toc-section\" id=\"Request_a_Custom_Quote_for_OS_Y_Gate_Valves\"><\/span>Request a Custom Quote for OS&amp;Y Gate Valves<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"26018\" data-end=\"26088\">When your project is ready for pricing or model confirmation, request:<\/p>\n<ul data-start=\"26089\" data-end=\"26193\">\n<li data-section-id=\"q5vl92\" data-start=\"26089\" data-end=\"26111\">commercial quotation<\/li>\n<li data-section-id=\"1g36150\" data-start=\"26112\" data-end=\"26133\">technical datasheet<\/li>\n<li data-section-id=\"41looe\" data-start=\"26134\" data-end=\"26147\">CAD drawing<\/li>\n<li data-section-id=\"15sq434\" data-start=\"26148\" data-end=\"26158\">3D model<\/li>\n<li data-section-id=\"22a3e\" data-start=\"26159\" data-end=\"26193\">dimensional drawing confirmation<\/li>\n<\/ul>\n<p data-start=\"26454\" data-end=\"26907\"><strong data-start=\"26454\" data-end=\"26480\">Recommended image here<\/strong><br data-start=\"26480\" data-end=\"26483\" \/><strong data-start=\"26483\" data-end=\"26493\">Image:<\/strong> NTGD original factory, inspection, or OS&amp;Y project photo<br data-start=\"26550\" data-end=\"26553\" \/><strong data-start=\"26553\" data-end=\"26570\">Insert after:<\/strong> the NTGD Certifications \/ Trust Signals block or before Related Internal Resources<br data-start=\"26653\" data-end=\"26656\" \/><strong data-start=\"26656\" data-end=\"26669\">Filename:<\/strong> <code data-start=\"26670\" data-end=\"26715\">ntgd-osy-valve-factory-inspection-photo.png<\/code><br data-start=\"26715\" data-end=\"26718\" \/><strong data-start=\"26718\" data-end=\"26731\">Alt text:<\/strong> <code data-start=\"26732\" data-end=\"26793\">NTGD OS&amp;Y valve factory inspection or project support photo<\/code><br data-start=\"26793\" data-end=\"26796\" \/><strong data-start=\"26796\" data-end=\"26808\">Caption:<\/strong> Figure 4: NTGD OS&amp;Y valve engineering support, inspection, and project documentation capabilities.<\/p>\n<hr data-start=\"26909\" data-end=\"26912\" \/>\n<h2 data-section-id=\"1k5q749\" data-start=\"26914\" data-end=\"26924\"><span class=\"ez-toc-section\" id=\"Summary\"><\/span>Summary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"26926\" data-end=\"27049\">An <strong data-start=\"26929\" data-end=\"26943\">OS&amp;Y valve<\/strong> is a rising stem gate valve with externally visible stem travel. The most important field rule is simple:<\/p>\n<ul data-start=\"27051\" data-end=\"27118\">\n<li data-section-id=\"1xfof6o\" data-start=\"27051\" data-end=\"27082\"><strong data-start=\"27053\" data-end=\"27082\">Stem up = OS&amp;Y valve open<\/strong><\/li>\n<li data-section-id=\"4gies1\" data-start=\"27083\" data-end=\"27118\"><strong data-start=\"27085\" data-end=\"27118\">Stem down = OS&amp;Y valve closed<\/strong><\/li>\n<\/ul>\n<p data-start=\"27120\" data-end=\"27310\">That visible stem movement is what makes OS&amp;Y valves especially useful in systems where inspection clarity matters. But identification is only the first step. Good selection also depends on:<\/p>\n<ul data-start=\"27311\" data-end=\"27449\">\n<li data-section-id=\"ch03cz\" data-start=\"27311\" data-end=\"27327\">pressure class<\/li>\n<li data-section-id=\"1pnmmg3\" data-start=\"27328\" data-end=\"27338\">material<\/li>\n<li data-section-id=\"1fmj3n5\" data-start=\"27339\" data-end=\"27355\">end connection<\/li>\n<li data-section-id=\"9w2u4k\" data-start=\"27356\" data-end=\"27380\">installation clearance<\/li>\n<li data-section-id=\"1h8d8li\" data-start=\"27381\" data-end=\"27400\">service condition<\/li>\n<li data-section-id=\"mlfm4q\" data-start=\"27401\" data-end=\"27425\">compliance requirement<\/li>\n<li data-section-id=\"1xo6r9\" data-start=\"27426\" data-end=\"27449\">documentation support<\/li>\n<\/ul>\n<p data-start=\"27451\" data-end=\"27631\">For engineers, contractors, and buyers, the real value of this page is not only understanding what OS&amp;Y means, but using that understanding to make a better specification decision.<\/p>\n<p data-start=\"27633\" data-end=\"27675\">For project support, NTGD can assist with:<\/p>\n<ul data-start=\"27676\" data-end=\"27847\" data-is-last-node=\"\" data-is-only-node=\"\">\n<li data-section-id=\"e5tq5z\" data-start=\"27676\" data-end=\"27698\">technical datasheets<\/li>\n<li data-section-id=\"e2sibq\" data-start=\"27699\" data-end=\"27721\">dimensional drawings<\/li>\n<li data-section-id=\"1kv5zrb\" data-start=\"27722\" data-end=\"27741\">selection support<\/li>\n<li data-section-id=\"h8f8i1\" data-start=\"27742\" data-end=\"27762\">quotation response<\/li>\n<li data-section-id=\"6jyx7s\" data-start=\"27763\" data-end=\"27847\" data-is-last-node=\"\">engineering clarification for fire protection and industrial shut-off applications<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Last Updated: March 2026 Reviewed by: NTGD Valve Engineering Team Expertise: Industrial Gate Valves, Fire Protection Systems, Shut-off Valve Engineering [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2901,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_eb_attr":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[45],"tags":[],"class_list":["post-2895","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/ntgdvalve.com\/ru\/wp-json\/wp\/v2\/posts\/2895","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ntgdvalve.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ntgdvalve.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ntgdvalve.com\/ru\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ntgdvalve.com\/ru\/wp-json\/wp\/v2\/comments?post=2895"}],"version-history":[{"count":2,"href":"https:\/\/ntgdvalve.com\/ru\/wp-json\/wp\/v2\/posts\/2895\/revisions"}],"predecessor-version":[{"id":8642,"href":"https:\/\/ntgdvalve.com\/ru\/wp-json\/wp\/v2\/posts\/2895\/revisions\/8642"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ntgdvalve.com\/ru\/wp-json\/wp\/v2\/media\/2901"}],"wp:attachment":[{"href":"https:\/\/ntgdvalve.com\/ru\/wp-json\/wp\/v2\/media?parent=2895"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ntgdvalve.com\/ru\/wp-json\/wp\/v2\/categories?post=2895"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ntgdvalve.com\/ru\/wp-json\/wp\/v2\/tags?post=2895"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}