{"id":9936,"date":"2026-05-29T07:40:48","date_gmt":"2026-05-29T07:40:48","guid":{"rendered":"https:\/\/ntgdvalve.com\/?p=9936"},"modified":"2026-05-29T07:40:48","modified_gmt":"2026-05-29T07:40:48","slug":"gate-valve-parts","status":"publish","type":"post","link":"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/","title":{"rendered":"\u0414\u0435\u0442\u0430\u043b\u0438 \u0438 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u044b \u0437\u0430\u0434\u0432\u0438\u0436\u0435\u043a: \u041a\u043e\u0440\u043f\u0443\u0441, \u043a\u0440\u044b\u0448\u043a\u0430, \u043a\u043b\u0438\u043d, \u0441\u0435\u0434\u043b\u043e, \u0448\u0442\u043e\u043a \u0438 \u0441\u0430\u043b\u044c\u043d\u0438\u043a"},"content":{"rendered":"<p><strong>Author Name:<\/strong> Bruce Zheng<\/p>\n<p><strong>Author Role:<\/strong> Co-Founder and Valve Engineer at NTGD Valve<\/p>\n<p><strong>Author Bio:<\/strong> Bruce Zheng is Co-Founder and Valve Engineer at NTGD Valve, focusing on industrial valve selection, application, and technical content for global B2B buyers.<\/p>\n<p><strong>Last Updated:<\/strong> May 28, 2026<\/p>\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 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#What_Are_the_Main_Parts_of_a_Gate_Valve\" >What Are the Main Parts of a Gate Valve?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Quick_Answer_Gate_Valve_Parts_at_a_Glance\" >Quick Answer: Gate Valve Parts at a Glance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Gate_Valve_Parts_vs_Gate_Valve_Components\" >Gate Valve Parts vs Gate Valve Components<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Gate_Valve_Parts_Diagram_and_Basic_Structure\" >Gate Valve Parts Diagram and Basic Structure<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#How_to_Read_a_Gate_Valve_Parts_Diagram\" >How to Read a Gate Valve Parts Diagram<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#What_a_Labeled_Gate_Valve_Diagram_Should_Show\" >What a Labeled Gate Valve Diagram Should Show<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Gate_Valve_Parts_and_Functions_Table\" >Gate Valve Parts and Functions Table<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Pressure_Boundary_Sealing_Interface_and_Operating_Path\" >Pressure Boundary, Sealing Interface and Operating Path<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Why_the_Same_Part_Name_May_Vary_by_Valve_Design\" >Why the Same Part Name May Vary by Valve Design<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Pressure-Retaining_Parts_Body_Bonnet_Gasket_and_Bolting\" >Pressure-Retaining Parts: Body, Bonnet, Gasket and Bolting<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#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-12\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Bonnet_and_Body-Bonnet_Joint\" >Bonnet and Body-Bonnet Joint<\/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\/gate-valve-parts\/#Gasket_Bolting_and_Pressure_Boundary_Details\" >Gasket, Bolting and Pressure Boundary Details<\/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\/gate-valve-parts\/#Shutoff_and_Sealing_Parts_Wedge_Gate_Seat_and_Trim\" >Shutoff and Sealing Parts: Wedge, Gate, Seat and Trim<\/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\/gate-valve-parts\/#Gate_Wedge_or_Disc\" >Gate, Wedge or Disc<\/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\/gate-valve-parts\/#Seat_and_Seat_Ring\" >Seat and Seat Ring<\/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\/gate-valve-parts\/#What_Are_Gate_Valve_Trim_Parts\" >What Are Gate Valve Trim Parts?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Operating_and_Leakage-Control_Parts\" >Operating and Leakage-Control Parts<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Stem_Stem_Nut_and_Yoke\" >Stem, Stem Nut and 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\/gate-valve-parts\/#Handwheel_Gearbox_and_Actuator\" >Handwheel, Gearbox and Actuator<\/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\/gate-valve-parts\/#Packing_Gland_and_Stuffing_Box\" >Packing, Gland and Stuffing Box<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#How_Gate_Valve_Parts_Work_Together\" >How Gate Valve Parts Work Together<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Opening_and_Closing_Movement\" >Opening and Closing Movement<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Why_Gate_Valves_Are_Normally_Fully_Open_or_Fully_Closed\" >Why Gate Valves Are Normally Fully Open or Fully Closed<\/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\/gate-valve-parts\/#Structure_Variants_to_Confirm_Before_RFQ\" >Structure Variants to Confirm Before RFQ<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Common_Part_Issues_and_RFQ_Specification_Checklist\" >Common Part Issues and RFQ Specification Checklist<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Common_Component_Issues_to_Watch\" >Common Component Issues to Watch<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Gate_Valve_Parts_RFQ_Checklist\" >Gate Valve Parts RFQ Checklist<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#When_to_Refer_to_Manufacturer_Documents\" >When to Refer to Manufacturer Documents<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#FAQ\" >FAQ<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#What_are_the_main_parts_of_a_gate_valve\" >What are the main parts of a gate valve?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#What_are_the_components_of_a_gate_valve\" >What are the components of a gate valve?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#What_are_the_trim_parts_of_a_gate_valve\" >What are the trim parts of a gate valve?<\/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\/gate-valve-parts\/#What_part_seals_a_gate_valve\" >What part seals a gate valve?<\/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\/gate-valve-parts\/#What_does_the_stem_do_in_a_gate_valve\" >What does the stem do in a gate valve?<\/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\/gate-valve-parts\/#How_does_a_gate_valve_work\" >How does a gate valve work?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Can_gate_valve_parts_be_replaced\" >Can gate valve parts be replaced?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Is_a_gate_valve_diagram_the_same_as_a_P_ID_symbol\" >Is a gate valve diagram the same as a P&amp;ID symbol?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-39\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Conclusion\" >Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-40\" href=\"https:\/\/ntgdvalve.com\/ru\/gate-valve-parts\/#Application_Specification_Support\" >Application \/ Specification Support<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_Are_the_Main_Parts_of_a_Gate_Valve\"><\/span>What Are the Main Parts of a Gate Valve?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A gate valve is made of several mechanical parts that work together to open or shut off flow in a pipeline. The main gate valve parts usually include the <strong>body<\/strong>, <strong>bonnet<\/strong>, <strong>gate or wedge<\/strong>, <strong>seat<\/strong>, <strong>stem<\/strong>, <strong>packing<\/strong>, <strong>gland<\/strong>, <strong>gasket<\/strong>, and an operating device such as a <strong>handwheel<\/strong>, <strong>gearbox<\/strong>, or <strong>actuator<\/strong>.<\/p>\n<p>In industrial service, these parts should not be viewed as a simple spare-parts list. Each component affects how the valve contains pressure, moves the gate, seals against the seat, prevents external leakage, and connects to the pipeline. For buyers and engineers, understanding these gate valve components helps when reviewing drawings, checking datasheets, preparing RFQs, or comparing different gate valve designs.<\/p>\n<p>For related product specifications, NTGD\u2019s <a href=\"https:\/\/ntgdvalve.com\/gate-valve\/\">industrial gate valve range<\/a> can be reviewed after the basic part functions are understood.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Quick_Answer_Gate_Valve_Parts_at_a_Glance\"><\/span>Quick Answer: Gate Valve Parts at a Glance<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<figure id=\"attachment_9944\" aria-describedby=\"caption-attachment-9944\" style=\"width: 2560px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-9944\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-dn800-workshop-inspection-scaled.jpg\" alt=\"DN700 and DN800 wedge gate valves under workshop inspection at NTGD\" width=\"2560\" height=\"1707\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-dn800-workshop-inspection-scaled.jpg 2560w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-dn800-workshop-inspection-768x512.jpg 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-dn800-workshop-inspection-1536x1024.jpg 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-dn800-workshop-inspection-2048x1365.jpg 2048w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-dn800-workshop-inspection-18x12.jpg 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-dn800-workshop-inspection-600x400.jpg 600w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-9944\" class=\"wp-caption-text\">DN700 and DN800 wedge gate valves during workshop handling and inspection.<\/figcaption><\/figure>\n<p>The following list covers the main gate valve parts that an industrial buyer, engineer, or maintenance team should be able to recognize on a drawing, datasheet, or specification sheet.<\/p>\n<p>The main parts of a gate valve are:<\/p>\n<ul>\n<li><strong>Body<\/strong> \u2014 the main pressure-retaining shell connected to the pipeline.<\/li>\n<li><strong>Bonnet<\/strong> \u2014 the upper pressure-retaining cover that supports the stem and packing area.<\/li>\n<li><strong>Gate \/ Wedge \/ Disc<\/strong> \u2014 the moving shutoff member that rises or lowers to open or close the flow path.<\/li>\n<li><strong>Seat \/ Seat Ring<\/strong> \u2014 the sealing surface where the gate contacts the valve body.<\/li>\n<li><strong>Stem<\/strong> \u2014 the threaded or moving shaft that transfers handwheel or actuator motion to the gate.<\/li>\n<li><strong>Packing and Gland<\/strong> \u2014 the sealing system around the stem that helps prevent leakage to atmosphere.<\/li>\n<li><strong>Gasket and Bolting<\/strong> \u2014 the sealing and fastening parts at the body-bonnet joint.<\/li>\n<li><strong>Handwheel, Gearbox or Actuator<\/strong> \u2014 the operating device used to move the stem and gate.<\/li>\n<\/ul>\n<p>A typical gate valve is mainly used for fully open or fully closed service. It is not normally selected for throttling because a partially open gate can expose the seat and gate surfaces to concentrated flow, vibration, and wear.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Gate_Valve_Parts_vs_Gate_Valve_Components\"><\/span>Gate Valve Parts vs Gate Valve Components<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In most industrial engineering discussions, <strong>gate valve parts<\/strong> and <strong>gate valve components<\/strong> refer to the same physical elements. The word <strong>parts<\/strong> is commonly used in procurement, maintenance, spare identification, and diagram-reading contexts. The word <strong>components<\/strong> is more often used in engineering specifications, datasheets, technical drawings, and design discussions.<\/p>\n<p>For an RFQ, both terms can be used naturally. A buyer may ask for the \u201cmain gate valve parts,\u201d while an engineer may review the \u201cgate valve components\u201d on a datasheet. In both cases, the important point is to identify the correct function, location, material requirement, and service condition for each part.<\/p>\n<p>This article is not a brand-specific replacement parts catalog. It explains the parts of a gate valve, how they function, and what information should be confirmed before specifying an industrial gate valve.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Gate_Valve_Parts_Diagram_and_Basic_Structure\"><\/span>Gate Valve Parts Diagram and Basic Structure<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A gate valve parts diagram should show the valve body, bonnet, stem, gate or wedge, seat area, packing gland, gasket, and operating device in their correct relative positions. For a B2B technical article, a <strong>labeled cutaway diagram<\/strong> is more useful than a simple outside view because it shows how the internal shutoff parts relate to the external pressure boundary.<\/p>\n<p>The diagram should make three basic structure zones clear:<\/p>\n<ol>\n<li><strong>Pressure boundary<\/strong> \u2014 body, bonnet, gasket, bolting, and end connections.<\/li>\n<li><strong>Shutoff and sealing interface<\/strong> \u2014 gate \/ wedge and seat \/ seat ring.<\/li>\n<li><strong>Operating and leakage-control system<\/strong> \u2014 stem, stem nut, yoke, packing, gland, handwheel, gearbox, or actuator.<\/li>\n<\/ol>\n<figure id=\"attachment_9939\" aria-describedby=\"caption-attachment-9939\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-9939\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-parts-labeled-cutaway-diagram.png\" alt=\"Labeled cutaway diagram of gate valve parts including body bonnet stem wedge seat packing and gasket\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-parts-labeled-cutaway-diagram.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-parts-labeled-cutaway-diagram-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-parts-labeled-cutaway-diagram-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-parts-labeled-cutaway-diagram-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-parts-labeled-cutaway-diagram-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-9939\" class=\"wp-caption-text\">Labeled gate valve cutaway showing the body, bonnet, stem, gate, seat ring, packing, gasket and operating device.<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"How_to_Read_a_Gate_Valve_Parts_Diagram\"><\/span>How to Read a Gate Valve Parts Diagram<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>When reading a gate valve diagram, start with the pressure boundary. Identify the body, bonnet, end connections, gasket area, and bolting first because these parts contain pressure and connect the valve to the pipeline. Then move to the shutoff interface, where the gate or wedge contacts the seat. Finally, check the operating and leakage-control path, including the stem, packing, gland, handwheel, gearbox, or actuator.<\/p>\n<p>This reading order helps engineers avoid confusing different failure modes. Body-bonnet leakage is not the same as seat leakage. Stem leakage is not the same as internal leakage across the gate. A clear diagram should help the reader separate these areas before reviewing materials, trim, or RFQ details.<\/p>\n<p>The body forms the main shell around the flow passage. Inside the body, the gate or wedge moves up and down across the flow path. The seat or seat ring is the sealing surface where the gate contacts the body when the valve is closed. Above the body, the bonnet closes the upper part of the valve and supports the stem area. Around the stem, packing and a gland assembly help control leakage where the stem exits the pressure boundary.<\/p>\n<p>A good gate valve parts diagram should not confuse a gate valve with a globe valve, ball valve, check valve, butterfly valve, or generic control valve. The key visual point is that the gate moves across a generally straight flow path to isolate flow, rather than rotating like a ball or disc.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_a_Labeled_Gate_Valve_Diagram_Should_Show\"><\/span>What a Labeled Gate Valve Diagram Should Show<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A useful labeled gate valve diagram should normally show:<\/p>\n<ul>\n<li>Body<\/li>\n<li>Bonnet<\/li>\n<li>Gate, wedge, or disc<\/li>\n<li>Seat or seat ring<\/li>\n<li>Stem<\/li>\n<li>Stem nut or yoke nut, if visible<\/li>\n<li>Packing<\/li>\n<li>Gland or gland follower<\/li>\n<li>Gasket at the body-bonnet joint<\/li>\n<li>Bolting, where applicable<\/li>\n<li>Handwheel, gearbox, or actuator<\/li>\n<li>End connection, such as flanged or welded ends<\/li>\n<\/ul>\n<p>The exact appearance depends on the gate valve design. A forged steel gate valve, cast steel gate valve, resilient seated gate valve, pressure seal bonnet gate valve, or OS&amp;Y gate valve may not look identical. The part names also vary slightly by manufacturer. That is why diagrams should be checked against the project datasheet and manufacturer drawing before procurement or maintenance decisions.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Gate_Valve_Parts_and_Functions_Table\"><\/span>Gate Valve Parts and Functions Table<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The table below summarizes common gate valve parts, their functions, key RFQ specification points, and common operational risks. It is intended to help buyers and engineers connect each component to a practical decision, not to replace a manufacturer-specific drawing or parts list.<\/p>\n<table>\n<thead>\n<tr>\n<th>Gate Valve Part<\/th>\n<th>Typical Location<\/th>\n<th>Main Function<\/th>\n<th>RFQ \/ Specification Note<\/th>\n<th>Common Issue to Watch<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Body<\/td>\n<td>Main valve shell connected to the pipeline<\/td>\n<td>Contains pressure and houses the internal flow passage<\/td>\n<td>Confirm body material, end connection, size, pressure class, and design standard<\/td>\n<td>Corrosion, erosion, casting or forging defects, body damage<\/td>\n<\/tr>\n<tr>\n<td>Bonnet<\/td>\n<td>Upper cover connected to the body<\/td>\n<td>Closes the upper pressure boundary and supports the stem area<\/td>\n<td>Confirm bonnet type, gasket design, bolting, and pressure-temperature suitability<\/td>\n<td>Leakage at body-bonnet joint, bolt relaxation, gasket failure<\/td>\n<\/tr>\n<tr>\n<td>Gate \/ Wedge \/ Disc<\/td>\n<td>Inside the body, moving across the flow path<\/td>\n<td>Opens or closes the flow passage<\/td>\n<td>Confirm wedge type and whether the design suits the service media<\/td>\n<td>Seat wear, jamming, surface damage<\/td>\n<\/tr>\n<tr>\n<td>Seat \/ Seat Ring<\/td>\n<td>Sealing area inside the body<\/td>\n<td>Provides the sealing surface against the gate<\/td>\n<td>Confirm seat design and trim material according to service<\/td>\n<td>Leakage, wear, erosion, debris damage<\/td>\n<\/tr>\n<tr>\n<td>Stem<\/td>\n<td>Extends from operating device to gate<\/td>\n<td>Transfers motion from handwheel, gearbox, or actuator to the gate<\/td>\n<td>Confirm rising or non-rising stem design if relevant<\/td>\n<td>Thread wear, bending, corrosion, difficult operation<\/td>\n<\/tr>\n<tr>\n<td>Stem Nut \/ Yoke Nut<\/td>\n<td>Around the stem or operating mechanism<\/td>\n<td>Converts rotary motion into linear gate movement in many designs<\/td>\n<td>Confirm design when operation method and torque matter<\/td>\n<td>Wear, thread damage, high operating torque<\/td>\n<\/tr>\n<tr>\n<td>Handwheel<\/td>\n<td>Top of manual valve<\/td>\n<td>Allows manual operation<\/td>\n<td>Confirm manual operation suitability for size and torque<\/td>\n<td>Broken handwheel, difficult operation<\/td>\n<\/tr>\n<tr>\n<td>Gearbox<\/td>\n<td>Between handwheel\/actuator and stem on larger valves<\/td>\n<td>Reduces operating effort or controls torque transmission<\/td>\n<td>Confirm gearbox requirement for larger or high-torque valves<\/td>\n<td>Gear wear, poor lubrication, difficult operation<\/td>\n<\/tr>\n<tr>\n<td>Actuator<\/td>\n<td>Top-mounted operating device<\/td>\n<td>Enables electric, pneumatic, hydraulic, or remote operation<\/td>\n<td>Confirm actuator type, control signal, fail position, and torque requirement<\/td>\n<td>Incorrect sizing, delayed response, control mismatch<\/td>\n<\/tr>\n<tr>\n<td>Packing<\/td>\n<td>Around the stem inside stuffing box<\/td>\n<td>Helps control external leakage along the stem<\/td>\n<td>Confirm packing material suitable for media and temperature<\/td>\n<td>Stem leakage, hardening, wear, over-compression, or temperature\/media mismatch<\/td>\n<\/tr>\n<tr>\n<td>Gland \/ Gland Follower<\/td>\n<td>Compresses packing around stem<\/td>\n<td>Maintains packing compression<\/td>\n<td>Confirm accessible adjustment and material compatibility<\/td>\n<td>Uneven compression, leakage, stem friction<\/td>\n<\/tr>\n<tr>\n<td>Stuffing Box<\/td>\n<td>Bonnet area around stem packing<\/td>\n<td>Holds packing and supports stem sealing<\/td>\n<td>Confirm design suitability for service pressure and temperature<\/td>\n<td>Packing extrusion, leakage, corrosion<\/td>\n<\/tr>\n<tr>\n<td>Gasket<\/td>\n<td>Between body and bonnet or other joints<\/td>\n<td>Seals static pressure joints<\/td>\n<td>Confirm gasket type and material according to service<\/td>\n<td>Joint leakage, blowout risk if incorrectly specified<\/td>\n<\/tr>\n<tr>\n<td>Bolting<\/td>\n<td>Body-bonnet joint or end connection<\/td>\n<td>Holds pressure-retaining parts together<\/td>\n<td>Confirm material and standard requirements for service<\/td>\n<td>Loosening, corrosion, improper tightening<\/td>\n<\/tr>\n<tr>\n<td>Yoke<\/td>\n<td>External support for stem and operating parts<\/td>\n<td>Supports rising stem or outside screw design<\/td>\n<td>Confirm if OS&amp;Y or rising stem visibility is required<\/td>\n<td>Mechanical damage, misalignment<\/td>\n<\/tr>\n<tr>\n<td>Backseat<\/td>\n<td>Near the upper stem\/bonnet area in some designs<\/td>\n<td>May provide secondary stem-area sealing in specific fully open conditions<\/td>\n<td>Confirm actual design and manufacturer instructions before relying on it<\/td>\n<td>Misuse, wear, false assumption of isolation<\/td>\n<\/tr>\n<tr>\n<td>Drain \/ Vent Plug<\/td>\n<td>Optional body or bonnet connection<\/td>\n<td>Draining, venting, or pressure release depending on design<\/td>\n<td>Confirm if required by project specification<\/td>\n<td>Plug leakage, corrosion, incorrect use<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The most important point is that a gate valve is not only a body, bonnet, gate, stem, and seat. For industrial service, packing, gland, gasket, bolting, stem nut, yoke, and actuator details can affect external leakage risk, maintenance frequency, operating torque, and RFQ accuracy.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Pressure_Boundary_Sealing_Interface_and_Operating_Path\"><\/span>Pressure Boundary, Sealing Interface and Operating Path<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A practical way to understand gate valve structure is to divide the components into three functional groups.<\/p>\n<table>\n<thead>\n<tr>\n<th>Structure Group<\/th>\n<th>Included Parts<\/th>\n<th>Main Role<\/th>\n<th>Buyer Check<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Pressure boundary<\/td>\n<td>Body, bonnet, gasket, bolting, end connections<\/td>\n<td>Contains internal pressure and connects the valve to the pipeline<\/td>\n<td>Material, pressure class, end connection, standard, gasket design<\/td>\n<\/tr>\n<tr>\n<td>Shutoff and sealing interface<\/td>\n<td>Gate \/ wedge \/ disc, seat \/ seat ring, sealing surfaces<\/td>\n<td>Stops or allows flow through the bore<\/td>\n<td>Seat design, trim material, wedge type, service media<\/td>\n<\/tr>\n<tr>\n<td>Operating and leakage-control path<\/td>\n<td>Stem, stem nut, handwheel, gearbox, actuator, packing, gland, stuffing box<\/td>\n<td>Moves the gate and controls leakage around the stem<\/td>\n<td>Operation method, torque, stem design, packing material, accessibility<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure id=\"attachment_9937\" aria-describedby=\"caption-attachment-9937\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-9937\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-components-functional-zones-diagram.png\" alt=\"Gate valve components grouped by pressure boundary, shutoff interface and operating path\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-components-functional-zones-diagram.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-components-functional-zones-diagram-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-components-functional-zones-diagram-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-components-functional-zones-diagram-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-components-functional-zones-diagram-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-9937\" class=\"wp-caption-text\">Gate valve components can be grouped by pressure boundary, shutoff interface and operating path.<\/figcaption><\/figure>\n<p>This grouping helps prevent a common specification mistake: treating all valve parts as equal. A damaged handwheel is not the same risk as a damaged seat. A gasket issue is not the same as seat leakage. Each component belongs to a different function group, and each function group affects specification in a different way.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Why_the_Same_Part_Name_May_Vary_by_Valve_Design\"><\/span>Why the Same Part Name May Vary by Valve Design<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Different manufacturers and standards may use slightly different part names. For example, the moving shutoff member may be called a <strong>gate<\/strong>, <strong>wedge<\/strong>, <strong>disc<\/strong>, or <strong>obturator<\/strong> depending on the drawing or valve type. The stem sealing area may be described as <strong>packing<\/strong>, <strong>gland packing<\/strong>, <strong>stuffing box<\/strong>, or <strong>gland assembly<\/strong>.<\/p>\n<p>This is normal, but it can create RFQ confusion. Describing the function and location of a part reduces the chance of name confusion between manufacturer drawings. For example, \u201cstem packing suitable for the service temperature\u201d is clearer than simply writing \u201cpacking\u201d without service context.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Pressure-Retaining_Parts_Body_Bonnet_Gasket_and_Bolting\"><\/span>Pressure-Retaining Parts: Body, Bonnet, Gasket and Bolting<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Pressure-retaining parts form the external shell of the gate valve. These parts must contain internal pressure and maintain mechanical integrity under the service conditions. In a typical gate valve, the most important pressure-retaining parts are the body and bonnet, supported by gaskets, bolting, and end connections.<\/p>\n<figure id=\"attachment_9941\" aria-describedby=\"caption-attachment-9941\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-9941\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-pressure-boundary-parts-diagram.png\" alt=\"Gate valve pressure boundary parts including body bonnet gasket bolting and end connection\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-pressure-boundary-parts-diagram.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-pressure-boundary-parts-diagram-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-pressure-boundary-parts-diagram-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-pressure-boundary-parts-diagram-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-pressure-boundary-parts-diagram-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-9941\" class=\"wp-caption-text\">Gate valve pressure boundary includes the body, bonnet, gasket, bolting and end connection area.<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Valve_Body\"><\/span>Valve Body<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<figure id=\"attachment_9947\" aria-describedby=\"caption-attachment-9947\" style=\"width: 2560px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-9947\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-flanged-body-end-connection-close-up-scaled.jpg\" alt=\"DN700 wedge gate valve flanged body and end connection close-up\" width=\"2560\" height=\"1707\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-flanged-body-end-connection-close-up-scaled.jpg 2560w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-flanged-body-end-connection-close-up-768x512.jpg 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-flanged-body-end-connection-close-up-1536x1024.jpg 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-flanged-body-end-connection-close-up-2048x1365.jpg 2048w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-flanged-body-end-connection-close-up-18x12.jpg 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-flanged-body-end-connection-close-up-600x400.jpg 600w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-9947\" class=\"wp-caption-text\">Flanged body and end connection detail on a DN700 wedge gate valve.<\/figcaption><\/figure>\n<p>The valve body is the main shell of the gate valve. It contains the flow passage, supports the seats, houses the gate, and connects the valve to the pipeline. In many industrial designs, the body also defines the end connection type, such as flanged, butt-weld, socket-weld, threaded, or other project-specific connections.<\/p>\n<p>The body affects several specification points:<\/p>\n<ul>\n<li>pressure class;<\/li>\n<li>body material;<\/li>\n<li>end connection;<\/li>\n<li>bore type;<\/li>\n<li>corrosion or erosion suitability;<\/li>\n<li>compatibility with service media;<\/li>\n<li>body-bonnet connection design.<\/li>\n<\/ul>\n<p>For general industrial gate valves, body material may vary according to service requirements. Common material families can include cast steel, forged steel, stainless steel, ductile iron, or alloy materials, but the correct choice must be matched to the service media, temperature range, pressure class, corrosion risk, and applicable project specification. If the body material or pressure-boundary design is mismatched to the service, the result may be accelerated corrosion, external leakage risk, or pressure-integrity problems.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Bonnet_and_Body-Bonnet_Joint\"><\/span>Bonnet and Body-Bonnet Joint<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<figure id=\"attachment_9945\" aria-describedby=\"caption-attachment-9945\" style=\"width: 2560px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-9945\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn800-bonnet-body-bolting-close-up-scaled.jpg\" alt=\"DN800 wedge gate valve bonnet and body bolting close-up\" width=\"2560\" height=\"1707\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn800-bonnet-body-bolting-close-up-scaled.jpg 2560w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn800-bonnet-body-bolting-close-up-768x512.jpg 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn800-bonnet-body-bolting-close-up-1536x1024.jpg 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn800-bonnet-body-bolting-close-up-2048x1365.jpg 2048w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn800-bonnet-body-bolting-close-up-18x12.jpg 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn800-bonnet-body-bolting-close-up-600x400.jpg 600w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-9945\" class=\"wp-caption-text\">Close-up of the bonnet, body-bonnet joint and bolting on a large wedge gate valve.<\/figcaption><\/figure>\n<p>The bonnet closes the upper part of the valve body and supports the stem and packing area. It is part of the pressure boundary, not just a cover. The body-bonnet joint must seal reliably because leakage at this joint is an external leakage risk.<\/p>\n<p>Bonnet design varies by valve type. Some gate valves use bolted bonnets, welded bonnets, threaded bonnets, or pressure seal bonnets. The current article does not expand bonnet types into a separate guide because bonnet selection depends on pressure class, temperature, service severity, maintenance expectations, and the manufacturer\u2019s design. In this parts guide, the key point is that the bonnet must be reviewed as part of the pressure boundary and stem-sealing structure.<\/p>\n<p>The body-bonnet joint should be reviewed together with the gasket and bolting. A suitable body material alone does not guarantee reliable sealing if the gasket, bolt material, tightening practice, or joint design is not appropriate for the service.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Gasket_Bolting_and_Pressure_Boundary_Details\"><\/span>Gasket, Bolting and Pressure Boundary Details<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Gaskets seal static joints such as the body-bonnet connection. Bolting holds the pressure-retaining parts together. These components may seem secondary, but they can strongly affect external leakage risk and maintenance reliability.<\/p>\n<p>For industrial procurement, the gasket and bolting should not be treated as generic accessories. The exact gasket type and bolting material should be verified against the valve design, pressure class, temperature, fluid, and applicable project requirements.<\/p>\n<p>Some gate valves also include a backseat feature near the upper stem area. A backseat may provide secondary sealing around the stem area under specific fully open conditions, but it should not be treated as a substitute for proper isolation, depressurization, or manufacturer-approved maintenance procedures.<\/p>\n<p>A useful RFQ should confirm:<\/p>\n<ul>\n<li>body material;<\/li>\n<li>bonnet type;<\/li>\n<li>gasket material or sealing design;<\/li>\n<li>bolt \/ nut material requirements, if specified;<\/li>\n<li>pressure class;<\/li>\n<li>applicable design and testing standards;<\/li>\n<li>service media and temperature.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Shutoff_and_Sealing_Parts_Wedge_Gate_Seat_and_Trim\"><\/span>Shutoff and Sealing Parts: Wedge, Gate, Seat and Trim<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The shutoff and sealing parts determine whether the gate valve can isolate flow properly. The key parts are the gate or wedge and the seat or seat ring. These parts form the internal sealing interface when the valve is closed.<\/p>\n<p>Correctly separating the pressure boundary from the shutoff interface helps avoid specification mistakes. A valve may have a suitable body material but still leak internally if the gate-seat interface is not suitable for the media, temperature, pressure differential, or solids content.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Gate_Wedge_or_Disc\"><\/span>Gate, Wedge or Disc<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The gate is the moving shutoff member inside the valve body. In many industrial gate valves, this part is wedge-shaped, so it may be called a <strong>wedge<\/strong>. Some drawings may use the word <strong>disc<\/strong>. The function is the same in the context of this article: it moves across the flow path to open or close the valve.<\/p>\n<p>When the valve opens, the gate moves upward and clears the flow passage. When the valve closes, the gate moves downward and contacts the seat surfaces. Because gate valves are designed mainly for isolation, they are normally used in fully open or fully closed positions.<\/p>\n<p>The gate or wedge affects:<\/p>\n<ul>\n<li>shutoff performance;<\/li>\n<li>operating torque;<\/li>\n<li>seat contact pattern;<\/li>\n<li>wear behavior;<\/li>\n<li>suitability for clean, dirty, high-temperature, or abrasive service.<\/li>\n<\/ul>\n<p>There are different gate designs, such as solid wedge, flexible wedge, split wedge, parallel gate, or other special structures. Specific wedge selection depends on service conditions such as pressure, temperature, media cleanliness, thermal expansion, and operating frequency. That belongs to gate valve selection or subtype design rather than basic parts identification, so this article only explains the gate or wedge as the general shutoff member.<\/p>\n<p>Detailed wedge, parallel and knife-route comparisons belong in a separate <a href=\"https:\/\/ntgdvalve.com\/gate-valve-types\/\">gate valve types guide<\/a>, while this section keeps the focus on the gate or wedge as the shutoff member.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Seat_and_Seat_Ring\"><\/span>Seat and Seat Ring<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<figure id=\"attachment_9938\" aria-describedby=\"caption-attachment-9938\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-9938\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-wedge-seat-sealing-interface-diagram.png\" alt=\"Gate valve wedge and seat ring sealing interface diagram\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-wedge-seat-sealing-interface-diagram.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-wedge-seat-sealing-interface-diagram-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-wedge-seat-sealing-interface-diagram-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-wedge-seat-sealing-interface-diagram-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-wedge-seat-sealing-interface-diagram-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-9938\" class=\"wp-caption-text\">The gate or wedge contacts the seat ring to create the internal shutoff seal.<\/figcaption><\/figure>\n<p>The seat is the sealing surface where the gate contacts the valve body. In some designs, the seat may be an integral part of the body. In others, separate seat rings may be installed. The exact construction depends on the valve design and manufacturer.<\/p>\n<p>The seat is critical because it directly affects internal leakage. A gate valve can have a strong body and a functional stem, but if the gate-seat interface is damaged, contaminated, or incorrectly specified, shutoff performance may be affected.<\/p>\n<p>Seat design should be reviewed according to:<\/p>\n<ul>\n<li>fluid type;<\/li>\n<li>temperature;<\/li>\n<li>pressure class;<\/li>\n<li>required shutoff performance;<\/li>\n<li>corrosion or erosion risk;<\/li>\n<li>trim material;<\/li>\n<li>whether the design is resilient seated or metal seated.<\/li>\n<\/ul>\n<p>Seat wear or damage is a common cause of internal leakage because the gate can no longer contact the sealing surface correctly. In services with particles, high temperature, corrosion, or erosion risk, the seat and trim should be specified according to those conditions instead of relying on a generic \u201cstandard seat\u201d description.<\/p>\n<p>For a deeper comparison of soft-seal and hard-seal seat routes, see NTGD\u2019s <a href=\"https:\/\/ntgdvalve.com\/resilient-seated-gate-valve-vs-metal-seated-gate-valve\/\">resilient seated vs metal seated gate valves<\/a> guide.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Are_Gate_Valve_Trim_Parts\"><\/span>What Are Gate Valve Trim Parts?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The word <strong>trim<\/strong> does not mean all gate valve parts. In many valve discussions, trim refers to the internal parts that are exposed to the fluid and are directly related to flow control or sealing. For a gate valve, trim commonly includes parts such as the gate or disc, seat or seat ring, stem, and related sealing surfaces.<\/p>\n<p>However, trim definitions may vary by manufacturer, standard, and valve type. For that reason, an RFQ should not only say \u201cstandard trim\u201d unless the project specification already defines what that means. A clearer request should identify the required trim material, seat design, stem material, and service conditions.<\/p>\n<p>A simple rule is:<\/p>\n<ul>\n<li><strong>Full parts<\/strong> = all components that make up the valve.<\/li>\n<li><strong>Trim parts<\/strong> = selected internal parts, usually those in contact with the fluid or involved in sealing and movement.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Operating_and_Leakage-Control_Parts\"><\/span>Operating and Leakage-Control Parts<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Operating parts move the gate. Leakage-control parts help prevent media from escaping along the stem or through static joints. These parts are important because a gate valve can fail to operate correctly even when the body, bonnet, gate, and seat are still structurally intact.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Stem_Stem_Nut_and_Yoke\"><\/span>Stem, Stem Nut and Yoke<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<figure id=\"attachment_9948\" aria-describedby=\"caption-attachment-9948\" style=\"width: 2560px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-9948\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-rising-stem-yoke-topworks-close-up-scaled.jpg\" alt=\"Wedge gate valve rising stem yoke and topworks close-up\" width=\"2560\" height=\"1707\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-rising-stem-yoke-topworks-close-up-scaled.jpg 2560w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-rising-stem-yoke-topworks-close-up-768x512.jpg 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-rising-stem-yoke-topworks-close-up-1536x1024.jpg 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-rising-stem-yoke-topworks-close-up-2048x1365.jpg 2048w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-rising-stem-yoke-topworks-close-up-18x12.jpg 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-rising-stem-yoke-topworks-close-up-600x400.jpg 600w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-9948\" class=\"wp-caption-text\">Close-up of the rising stem, yoke and topworks area on large wedge gate valves.<\/figcaption><\/figure>\n<p>The stem connects the operating device to the gate. In many gate valve designs, turning the handwheel or actuator causes the stem or stem nut mechanism to move the gate up or down. The stem must transmit motion and force while remaining aligned with the gate.<\/p>\n<p>Stem design affects:<\/p>\n<ul>\n<li>operating torque;<\/li>\n<li>valve position visibility;<\/li>\n<li>maintenance access;<\/li>\n<li>suitability for buried or above-ground service;<\/li>\n<li>compatibility with manual, gearbox, or actuator operation.<\/li>\n<\/ul>\n<p>The stem nut converts rotary motion from the handwheel, gearbox, or actuator into linear movement of the gate in many gate valve designs. If the stem nut is worn or damaged, the valve may require excessive operating torque or may fail to open and close properly. The yoke provides structural support for the stem and operating mechanism, helping maintain alignment during operation.<\/p>\n<p>If the drawing shows an outside screw and yoke arrangement, NTGD\u2019s <a href=\"https:\/\/ntgdvalve.com\/osy-valve\/\">OS&amp;Y valve guide<\/a> can help confirm how visible stem travel relates to valve position.<\/p>\n<p>Some gate valves use rising stems, while others use non-rising stems. That design difference is important, but it should not dominate this article. Here, the key point is that the stem is the motion-transfer component. Detailed comparison of rising stem and non-rising stem gate valves should be handled in a dedicated page or internal link.<\/p>\n<p>Detailed stem-route selection should be reviewed in a dedicated <a href=\"https:\/\/ntgdvalve.com\/rising-stem-gate-valve-vs-non-rising-stem-gate-valve\/\">rising stem vs non-rising stem gate valve<\/a> comparison instead of being expanded inside a parts guide.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Handwheel_Gearbox_and_Actuator\"><\/span>Handwheel, Gearbox and Actuator<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The handwheel is the most common manual operating device for smaller or moderate-size gate valves. Larger valves or high-torque applications may require a gearbox. Automated systems may use electric, pneumatic, or hydraulic actuators, depending on project requirements.<\/p>\n<p>The operating device should be selected according to:<\/p>\n<ul>\n<li>valve size;<\/li>\n<li>pressure class;<\/li>\n<li>operating torque;<\/li>\n<li>frequency of operation;<\/li>\n<li>installation position;<\/li>\n<li>accessibility;<\/li>\n<li>automation requirements;<\/li>\n<li>control system requirements.<\/li>\n<\/ul>\n<p>This article does not become an actuator selection guide. The purpose is to show that the operating device is part of the gate valve component system. If the operation method is not specified correctly, the valve may be difficult to open or close, or may not match the control requirements of the pipeline system.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Packing_Gland_and_Stuffing_Box\"><\/span>Packing, Gland and Stuffing Box<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<figure id=\"attachment_9942\" aria-describedby=\"caption-attachment-9942\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-9942\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-stem-packing-gland-detail-diagram.png\" alt=\"Gate valve stem packing gland and stuffing box detail diagram\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-stem-packing-gland-detail-diagram.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-stem-packing-gland-detail-diagram-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-stem-packing-gland-detail-diagram-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-stem-packing-gland-detail-diagram-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-stem-packing-gland-detail-diagram-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-9942\" class=\"wp-caption-text\">Stem packing and the gland assembly help control external leakage around the gate valve stem.<\/figcaption><\/figure>\n<p>Packing is installed around the stem to control leakage to atmosphere. The packing is held and compressed by the gland or gland follower, and it is housed in the stuffing box area. This is one of the most important leakage-control zones in a gate valve.<\/p>\n<p>The packing system must seal around a moving stem. Compression that is too low can cause stem leakage. Compression that is too high can increase operating torque, accelerate stem wear, or make the valve difficult to operate. The correct balance depends on valve design, packing material, pressure, temperature, media, and maintenance practice.<\/p>\n<p>A buyer or engineer should confirm:<\/p>\n<ul>\n<li>packing material;<\/li>\n<li>gland design;<\/li>\n<li>accessibility for adjustment;<\/li>\n<li>suitability for service temperature and media;<\/li>\n<li>whether special leakage control requirements apply.<\/li>\n<\/ul>\n<p>Packing, gland, and stuffing box details are often overlooked in basic gate valve parts lists. For industrial service, they should not be ignored because they directly affect external leakage control, maintenance access, and long-term operation.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_Gate_Valve_Parts_Work_Together\"><\/span>How Gate Valve Parts Work Together<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Gate valve parts work together through a simple but important sequence: the operating device turns or actuates the stem, the stem moves the gate, and the gate opens or closes against the seat. The body and bonnet contain pressure, while the packing and gasket systems help control external leakage.<\/p>\n<div class=\"ntgd-video-embed\" style=\"position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; margin: 28px 0;\"><iframe style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0;\" title=\"Two minute wedge gate valve assembly at NTGD\" src=\"https:\/\/www.youtube.com\/embed\/jREnRhemte8\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/div>\n<h3><span class=\"ez-toc-section\" id=\"Opening_and_Closing_Movement\"><\/span>Opening and Closing Movement<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>When a manual gate valve is operated, the handwheel turns the stem or stem nut mechanism. This movement raises or lowers the gate. When the gate moves upward, the flow path opens. When the gate moves downward, it contacts the seat surfaces and shuts off the flow.<\/p>\n<p>This operating logic explains why the major parts cannot be selected independently. The gate must match the seat. The stem must match the operating device. The packing must seal around the stem while still allowing operation. The body and bonnet must contain pressure while supporting the internal moving parts.<\/p>\n<figure id=\"attachment_9940\" aria-describedby=\"caption-attachment-9940\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-9940\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-open-closed-position-movement-diagram.png\" alt=\"Gate valve open and closed position movement diagram\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-open-closed-position-movement-diagram.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-open-closed-position-movement-diagram-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-open-closed-position-movement-diagram-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-open-closed-position-movement-diagram-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/gate-valve-open-closed-position-movement-diagram-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-9940\" class=\"wp-caption-text\">Gate valves are normally used fully open or fully closed, with the gate raised or seated.<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Why_Gate_Valves_Are_Normally_Fully_Open_or_Fully_Closed\"><\/span>Why Gate Valves Are Normally Fully Open or Fully Closed<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Gate valves are normally selected for isolation service. In the fully open position, the gate is lifted out of the main flow path. In the fully closed position, the gate contacts the seat to stop flow.<\/p>\n<p>A gate valve should generally not be used as a throttling valve. In a partially open position, flow can concentrate around the lower edge of the gate and seat area. Depending on the service, this can cause vibration, erosion, noise, or seat damage. Over time, this type of operation may reduce shutoff reliability, increase maintenance exposure, and shorten the useful service life of the valve in demanding applications.<\/p>\n<p>The <a href=\"https:\/\/engineeringlibrary.org\/reference\/valves-doe-handbook\" target=\"_blank\" rel=\"noopener\">DOE valve handbook reference<\/a> also explains that a partially open gate can vibrate and accelerate disk and seat wear, which supports keeping gate valves in full-open or full-closed isolation service.<\/p>\n<p>For applications that require frequent throttling or precise flow regulation, another valve type may be more suitable.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Structure_Variants_to_Confirm_Before_RFQ\"><\/span>Structure Variants to Confirm Before RFQ<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A gate valve parts guide should not become a full gate valve types guide, but some structure variants should still be confirmed before RFQ because they affect drawings, operation, and maintenance.<\/p>\n<p>Key variants include:<\/p>\n<ul>\n<li><strong>Gate \/ wedge design<\/strong> \u2014 solid wedge, flexible wedge, split wedge, parallel gate, or other design depending on service.<\/li>\n<li><strong>Stem design<\/strong> \u2014 rising stem, non-rising stem, or OS&amp;Y arrangement depending on position indication and installation needs.<\/li>\n<li><strong>Bonnet design<\/strong> \u2014 bolted, welded, pressure seal, or other construction depending on pressure class and maintenance expectations.<\/li>\n<li><strong>Seat design<\/strong> \u2014 metal seated, resilient seated, replaceable seat ring, or integral seat depending on valve type.<\/li>\n<li><strong>Operation method<\/strong> \u2014 handwheel, gearbox, electric actuator, pneumatic actuator, or hydraulic actuator.<\/li>\n<li><strong>End connection<\/strong> \u2014 flanged, butt-weld, socket-weld, threaded, or other connection.<\/li>\n<\/ul>\n<p>These points belong in the RFQ checklist, not as long standalone sections in a parts guide. Expanding them too much would shift the article into a gate valve types or selection guide.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Common_Part_Issues_and_RFQ_Specification_Checklist\"><\/span>Common Part Issues and RFQ Specification Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Understanding gate valve parts also helps identify what to check before purchase, inspection, or maintenance planning. This section is not a troubleshooting manual. It is a practical bridge between parts knowledge and industrial specification.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Common_Component_Issues_to_Watch\"><\/span>Common Component Issues to Watch<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<table>\n<thead>\n<tr>\n<th>Component Area<\/th>\n<th>Possible Issue<\/th>\n<th>Why It Matters<\/th>\n<th>What to Confirm<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Body<\/td>\n<td>Corrosion, erosion, mechanical damage<\/td>\n<td>Can affect pressure boundary integrity<\/td>\n<td>Body material, service media, pressure class<\/td>\n<\/tr>\n<tr>\n<td>Bonnet joint<\/td>\n<td>External leakage<\/td>\n<td>Can indicate gasket, bolting, or joint issue<\/td>\n<td>Gasket type, bolting, tightening requirements<\/td>\n<\/tr>\n<tr>\n<td>Gate \/ wedge<\/td>\n<td>Surface damage or jamming<\/td>\n<td>Can affect shutoff and operation<\/td>\n<td>Wedge design, guide condition, media cleanliness<\/td>\n<\/tr>\n<tr>\n<td>Seat \/ seat ring<\/td>\n<td>Wear, erosion, debris damage<\/td>\n<td>Can cause internal leakage<\/td>\n<td>Seat material, service conditions, sealing requirement<\/td>\n<\/tr>\n<tr>\n<td>Stem<\/td>\n<td>Thread wear, bending, corrosion<\/td>\n<td>Can make operation difficult or unreliable<\/td>\n<td>Stem design, material, operation method<\/td>\n<\/tr>\n<tr>\n<td>Packing \/ gland<\/td>\n<td>Stem leakage or high friction<\/td>\n<td>Can affect external leakage and operating torque<\/td>\n<td>Packing material, gland adjustment, temperature<\/td>\n<\/tr>\n<tr>\n<td>Handwheel \/ gearbox \/ actuator<\/td>\n<td>Difficult operation or mismatch<\/td>\n<td>Can prevent full opening or closing<\/td>\n<td>Required torque, accessibility, automation needs<\/td>\n<\/tr>\n<tr>\n<td>Gasket \/ bolting<\/td>\n<td>Joint leakage or loosening<\/td>\n<td>Can affect pressure boundary sealing<\/td>\n<td>Gasket material, bolt material, assembly practice<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>These issues show why an RFQ should describe the actual service conditions, not only the valve size. Service media, temperature, pressure class, operating frequency, installation position, and required documentation all affect which components and materials are suitable.<\/p>\n<p>If the problem involves leakage, hard operation or incomplete travel, route the issue into a dedicated <a href=\"https:\/\/ntgdvalve.com\/how-to-maintain-and-troubleshoot-gate-valves-for-optimal-performance\/\">gate valve maintenance and troubleshooting<\/a> review rather than turning this parts guide into a repair manual.<\/p>\n<div class=\"ntgd-video-embed\" style=\"position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; margin: 28px 0;\"><iframe style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0;\" title=\"36 inch gate valve assembly and hydrostatic testing at NTGD\" src=\"https:\/\/www.youtube.com\/embed\/oVIzU2dNCmE\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/div>\n<h3><span class=\"ez-toc-section\" id=\"Gate_Valve_Parts_RFQ_Checklist\"><\/span>Gate Valve Parts RFQ Checklist<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Each item in this checklist corresponds to a critical gate valve component or design feature discussed above. Providing complete and accurate information helps the manufacturer quote a valve construction that matches the required performance, safety, and durability conditions.<\/p>\n<table>\n<thead>\n<tr>\n<th>RFQ Item<\/th>\n<th>Why It Matters<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Valve size<\/td>\n<td>Determines body, bore, end connection, and operating torque<\/td>\n<\/tr>\n<tr>\n<td>Pressure class \/ rating<\/td>\n<td>Affects body, bonnet, bolting, gasket, and pressure boundary design<\/td>\n<\/tr>\n<tr>\n<td>Body material<\/td>\n<td>Must match service media, temperature, and corrosion requirements<\/td>\n<\/tr>\n<tr>\n<td>Bonnet type<\/td>\n<td>Affects pressure boundary, maintenance access, and service suitability<\/td>\n<\/tr>\n<tr>\n<td>Wedge \/ gate type<\/td>\n<td>Affects sealing behavior, operating torque, and service fit<\/td>\n<\/tr>\n<tr>\n<td>Seat \/ trim material<\/td>\n<td>Affects shutoff, wear resistance, corrosion resistance, and temperature suitability<\/td>\n<\/tr>\n<tr>\n<td>Stem design<\/td>\n<td>Rising or non-rising design affects operation, visibility, and installation<\/td>\n<\/tr>\n<tr>\n<td>Operation method<\/td>\n<td>Manual, gearbox, electric, pneumatic, or hydraulic operation changes topworks and torque requirements<\/td>\n<\/tr>\n<tr>\n<td>End connection<\/td>\n<td>Must match pipeline connection and installation requirement<\/td>\n<\/tr>\n<tr>\n<td>Design \/ testing standard<\/td>\n<td>Should be verified against project specification and applicable gate valve standards when required<\/td>\n<\/tr>\n<tr>\n<td>Service media<\/td>\n<td>Affects material, seat, trim, packing, gasket, and corrosion decisions<\/td>\n<\/tr>\n<tr>\n<td>Temperature<\/td>\n<td>Affects body, trim, gasket, packing, and bolting selection<\/td>\n<\/tr>\n<tr>\n<td>Documentation requirements<\/td>\n<td>May include drawings, material certificates, test reports, inspection records, or project-specific documents<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For steel bolted-bonnet gate valve projects, API\u2019s current notices confirm that <a href=\"https:\/\/www.api.org\/products-and-services\/api-monogram-and-apiqr\/latest-updates\" target=\"_blank\" rel=\"noopener\">API Standard 600<\/a> is maintained under API\u2019s program updates, so the applicable edition and project standard should be verified before procurement.<\/p>\n<p>A clear RFQ should connect each part to the service condition. For example, seat and trim material should not be chosen separately from media and temperature. Operation method should not be chosen separately from torque and accessibility. Packing and gasket should not be treated as generic items when leakage control matters.<\/p>\n<p>When project documentation requires API-related language, NTGD\u2019s <a href=\"https:\/\/ntgdvalve.com\/a-guide-to-api-standards-for-gate-valves-ensuring-compliance-and-quality\/\">API standards for gate valves<\/a> guide can help separate design, testing and documentation references before the final RFQ.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"When_to_Refer_to_Manufacturer_Documents\"><\/span>When to Refer to Manufacturer Documents<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Manufacturer drawings, datasheets, IOM manuals, and project specifications should be used when exact part identification is required. This is especially important for replacement, repair, or maintenance work.<\/p>\n<p>A general article can explain where the body, bonnet, stem, gate, seat, packing, and gasket are located. It cannot confirm the exact part number, material, dimension, or replacement method for every valve model. Those details must come from the specific manufacturer document or approved project drawing.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"What_are_the_main_parts_of_a_gate_valve\"><\/span>What are the main parts of a gate valve?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The main parts of a gate valve usually include the body, bonnet, gate or wedge, seat, stem, packing, gland, gasket, and an operating device such as a handwheel, gearbox, or actuator. Industrial designs may also include a yoke, stem nut, backseat, drain plug, vent plug, or special sealing parts.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_are_the_components_of_a_gate_valve\"><\/span>What are the components of a gate valve?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Gate valve components can be grouped into pressure-retaining parts, shutoff and sealing parts, operating parts, and leakage-control parts. The body and bonnet contain pressure. The gate and seat shut off flow. The stem and handwheel or actuator move the gate. Packing, gland, gasket, and bolting help control leakage.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_are_the_trim_parts_of_a_gate_valve\"><\/span>What are the trim parts of a gate valve?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Gate valve trim usually refers to selected internal parts exposed to the fluid or involved in sealing and movement. It commonly includes the gate or disc, seat or seat ring, stem, and related sealing surfaces. The exact definition can vary, so trim material should be confirmed against the datasheet or project specification.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_part_seals_a_gate_valve\"><\/span>What part seals a gate valve?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The gate and seat create the internal shutoff seal. The packing, gland, gasket, and body-bonnet joint control external leakage at different locations. These sealing areas should not be confused because internal leakage and external leakage have different causes and different inspection requirements.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_does_the_stem_do_in_a_gate_valve\"><\/span>What does the stem do in a gate valve?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The stem transfers motion from the handwheel, gearbox, or actuator to the gate. Depending on the design, the stem or stem nut mechanism raises or lowers the gate to open or close the valve. Stem design affects operation, position indication, maintenance access, and installation requirements.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_does_a_gate_valve_work\"><\/span>How does a gate valve work?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A gate valve works by moving a gate or wedge up and down across the flow path. When the gate is raised, the flow path opens. When it is lowered against the seat, the valve closes. Gate valves are normally used for fully open or fully closed isolation service, not for precise throttling.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_gate_valve_parts_be_replaced\"><\/span>Can gate valve parts be replaced?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Some gate valve parts may be replaceable depending on the specific valve design, manufacturer, and service condition. However, this article is a general industrial parts guide, not a replacement parts catalog or repair manual. Not every seat ring, stem, packing set, or bonnet component is designed for simple field replacement, so all replacement work should follow manufacturer-approved parts, official IOM documents, and project safety procedures.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_a_gate_valve_diagram_the_same_as_a_P_ID_symbol\"><\/span>Is a gate valve diagram the same as a P&amp;ID symbol?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. A gate valve parts diagram shows the physical structure and labeled components of the valve, such as the body, bonnet, stem, gate, and seat. A P&amp;ID symbol is a simplified schematic symbol used in piping and instrumentation drawings. This article focuses on physical parts diagrams, not P&amp;ID symbols.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Gate valve parts should be understood as a working system, not as isolated names on a drawing. The body and bonnet form the pressure boundary. The gate or wedge and seat form the shutoff interface. The stem, stem nut, yoke, handwheel, gearbox, or actuator move the gate. Packing, gland, gasket, and bolting help control leakage and maintain pressure integrity.<\/p>\n<p>For industrial buyers, this structure matters because each part affects a specification decision. A clear RFQ should connect component requirements to service media, pressure class, temperature, material, operation method, standards, and documentation needs.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Application_Specification_Support\"><\/span>Application \/ Specification Support<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<figure id=\"attachment_9943\" aria-describedby=\"caption-attachment-9943\" style=\"width: 700px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-9943\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-pn25-workshop-assembly-scaled.jpg\" alt=\"DN700 PN25 wedge gate valve during workshop assembly at NTGD\" width=\"700\" height=\"1050\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-pn25-workshop-assembly-scaled.jpg 1707w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-pn25-workshop-assembly-768x1152.jpg 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-pn25-workshop-assembly-1024x1536.jpg 1024w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-pn25-workshop-assembly-1365x2048.jpg 1365w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-pn25-workshop-assembly-8x12.jpg 8w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/05\/wedge-gate-valve-dn700-pn25-workshop-assembly-600x900.jpg 600w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><figcaption id=\"caption-attachment-9943\" class=\"wp-caption-text\">DN700 PN25 wedge gate valve during workshop assembly at NTGD.<\/figcaption><\/figure>\n<p>NTGD can review gate valve requirements based on project media, pressure, temperature, material, operation method, and documentation needs to help match the correct parts and construction to the service conditions.<\/p>\n<p>For broader valve-function screening before specifying a gate valve, NTGD\u2019s <a href=\"https:\/\/ntgdvalve.com\/instructions-for-selection-of-industrial-valves\/\">industrial valve selection guide<\/a> can help confirm whether the application needs isolation, throttling, backflow prevention or another valve function.<\/p>\n<p>For a reliable quotation, provide the service conditions and required specifications rather than only a part name or a general valve type.<br \/>\n<script type=\"application\/ld+json\"> { \"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [ { \"@type\": \"Question\", \"name\": \"What are the main parts of a gate valve?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"The main parts of a gate valve usually include the body, bonnet, gate or wedge, seat, stem, packing, gland, gasket, and an operating device such as a handwheel, gearbox, or actuator. Industrial designs may also include a yoke, stem nut, backseat, drain plug, vent plug, or special sealing parts.\" } }, { \"@type\": \"Question\", \"name\": \"What are the components of a gate valve?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Gate valve components can be grouped into pressure-retaining parts, shutoff and sealing parts, operating parts, and leakage-control parts. The body and bonnet contain pressure. The gate and seat shut off flow. The stem and handwheel or actuator move the gate. Packing, gland, gasket, and bolting help control leakage.\" } }, { \"@type\": \"Question\", \"name\": \"What are the trim parts of a gate valve?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Gate valve trim usually refers to selected internal parts exposed to the fluid or involved in sealing and movement. It commonly includes the gate or disc, seat or seat ring, stem, and related sealing surfaces. The exact definition can vary, so trim material should be confirmed against the datasheet or project specification.\" } }, { \"@type\": \"Question\", \"name\": \"What part seals a gate valve?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"The gate and seat create the internal shutoff seal. The packing, gland, gasket, and body-bonnet joint control external leakage at different locations. These sealing areas should not be confused because internal leakage and external leakage have different causes and different inspection requirements.\" } }, { \"@type\": \"Question\", \"name\": \"What does the stem do in a gate valve?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"The stem transfers motion from the handwheel, gearbox, or actuator to the gate. Depending on the design, the stem or stem nut mechanism raises or lowers the gate to open or close the valve. Stem design affects operation, position indication, maintenance access, and installation requirements.\" } }, { \"@type\": \"Question\", \"name\": \"How does a gate valve work?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"A gate valve works by moving a gate or wedge up and down across the flow path. When the gate is raised, the flow path opens. When it is lowered against the seat, the valve closes. Gate valves are normally used for fully open or fully closed isolation service, not for precise throttling.\" } }, { \"@type\": \"Question\", \"name\": \"Can gate valve parts be replaced?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"Some gate valve parts may be replaceable depending on the specific valve design, manufacturer, and service condition. However, this article is a general industrial parts guide, not a replacement parts catalog or repair manual. Not every seat ring, stem, packing set, or bonnet component is designed for simple field replacement, so all replacement work should follow manufacturer-approved parts, official IOM documents, and project safety procedures.\" } }, { \"@type\": \"Question\", \"name\": \"Is a gate valve diagram the same as a P&ID symbol?\", \"acceptedAnswer\": { \"@type\": \"Answer\", \"text\": \"No. A gate valve parts diagram shows the physical structure and labeled components of the valve, such as the body, bonnet, stem, gate, and seat. A P&ID symbol is a simplified schematic symbol used in piping and instrumentation drawings. This article focuses on physical parts diagrams, not P&ID symbols.\" } } ] } <\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u041f\u0440\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0435 \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u043e \u043f\u043e \u043e\u0441\u043d\u043e\u0432\u043d\u044b\u043c \u0447\u0430\u0441\u0442\u044f\u043c \u0438 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u0430\u043c \u0437\u0430\u0434\u0432\u0438\u0436\u0435\u043a, \u0432\u043a\u043b\u044e\u0447\u0430\u044f \u043a\u043e\u0440\u043f\u0443\u0441, \u0432\u0435\u0440\u0445\u043d\u044e\u044e \u0447\u0430\u0441\u0442\u044c, \u043a\u043b\u0438\u043d, \u0441\u0435\u0434\u043b\u043e, \u0448\u0442\u043e\u043a, \u0441\u0430\u043b\u044c\u043d\u0438\u043a, \u0441\u0445\u0435\u043c\u044b, \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 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