{"id":2834,"date":"2022-04-24T08:11:14","date_gmt":"2022-04-24T08:11:14","guid":{"rendered":"http:\/\/sinovalveco.com\/?p=2834"},"modified":"2026-06-23T05:56:55","modified_gmt":"2026-06-23T05:56:55","slug":"api-6d-ball-valve","status":"publish","type":"post","link":"https:\/\/ntgdvalve.com\/fr\/api-6d-ball-valve\/","title":{"rendered":"Robinet \u00e0 tournant sph\u00e9rique API 6D"},"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> June 22, 2026<\/p>\n<p>An <strong>API 6D ball valve<\/strong> is a pipeline-service ball valve designed, manufactured, tested, and documented according to API 6D requirements when the project specification calls for this standard. It is commonly used for pipeline isolation in oil, gas, petrochemical, transmission, terminal, and related process systems where shutoff reliability, pressure boundary integrity, testing records, and traceability are important before purchase approval.<\/p>\n<p>Unlike a general-purpose industrial ball valve, an API 6D ball valve is normally reviewed as part of a project acceptance process. The difference is not only the valve shape. It also involves design verification, pressure testing, material traceability, marking, inspection records, and documentation that must match the RFQ, datasheet, piping class, and project standard.<\/p>\n<p>For buyers and project engineers, the term does not only describe a ball valve with a rotating ball. It points to a specification framework. Before ordering API 6D ball valves, the <a href=\"https:\/\/ntgdvalve.com\/how-to-select-the-right-ball-valve-for-your-industrial-application\/\">ball valve selection factors<\/a>\u2014including valve type, bore design, body construction, seat design, pressure class, material, operation method, testing records, and required documents\u2014should be confirmed before quotation and production.<\/p>\n<p>In practical RFQ language, \u201cAPI6D ball valve\u201d and \u201cball valve API 6D\u201d usually refer to the same product category, but the final selection should always be confirmed by the complete valve specification, not by the name alone.<\/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\/fr\/api-6d-ball-valve\/#What_Is_an_API_6D_Ball_Valve\" >What Is an API 6D Ball Valve?<\/a><\/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\/fr\/api-6d-ball-valve\/#What_API_6D_Means_for_Ball_Valves\" >What API 6D Means for Ball Valves<\/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\/fr\/api-6d-ball-valve\/#API_6D_Scope_Ball_Gate_Check_and_Plug_Valves\" >API 6D Scope: Ball, Gate, Check and Plug Valves<\/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\/fr\/api-6d-ball-valve\/#Why_This_Page_Focuses_on_Ball_Valves\" >Why This Page Focuses on Ball Valves<\/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\/fr\/api-6d-ball-valve\/#How_an_API_6D_Ball_Valve_Works_in_Pipeline_Service\" >How an API 6D Ball Valve Works in Pipeline Service<\/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\/fr\/api-6d-ball-valve\/#Quarter-Turn_Shutoff_and_Flow_Path\" >Quarter-Turn Shutoff and Flow Path<\/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\/fr\/api-6d-ball-valve\/#Full_Bore_vs_Reduced_Bore\" >Full Bore vs Reduced Bore<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/ntgdvalve.com\/fr\/api-6d-ball-valve\/#Main_Types_of_API_6D_Ball_Valves\" >Main Types of API 6D Ball Valves<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/ntgdvalve.com\/fr\/api-6d-ball-valve\/#Floating_vs_Trunnion_Mounted\" >Floating vs Trunnion Mounted<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/ntgdvalve.com\/fr\/api-6d-ball-valve\/#Side-Entry_Top-Entry_Split-Body_and_Welded_Body\" >Side-Entry, Top-Entry, Split-Body and Welded Body<\/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\/fr\/api-6d-ball-valve\/#Manual_Gearbox_and_Actuated_Operation\" >Manual, Gearbox and Actuated Operation<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/ntgdvalve.com\/fr\/api-6d-ball-valve\/#Key_Components_and_Design_Features_to_Review\" >Key Components and Design Features to Review<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/ntgdvalve.com\/fr\/api-6d-ball-valve\/#Body_Ball_Seats_Stem_Packing_and_Bonnet\" >Body, Ball, Seats, Stem, Packing and Bonnet<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/ntgdvalve.com\/fr\/api-6d-ball-valve\/#Seat_Design_DBB_DIB_and_Cavity_Pressure_Relief\" >Seat Design, DBB \/ DIB and Cavity Pressure Relief<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/ntgdvalve.com\/fr\/api-6d-ball-valve\/#Forged_vs_Cast_Body_Material\" >Forged vs Cast Body Material<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/ntgdvalve.com\/fr\/api-6d-ball-valve\/#Testing_Inspection_and_Documentation_to_Confirm\" >Testing, Inspection and Documentation to Confirm<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/ntgdvalve.com\/fr\/api-6d-ball-valve\/#Pressure_Seat_and_Functional_Test_Records\" >Pressure, Seat and Functional Test Records<\/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\/fr\/api-6d-ball-valve\/#Material_Certificates_Traceability_and_Inspection_Records\" >Material Certificates, Traceability and Inspection Records<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/ntgdvalve.com\/fr\/api-6d-ball-valve\/#Applications_Fit_and_Selection_Limits\" >Applications, Fit and Selection Limits<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/ntgdvalve.com\/fr\/api-6d-ball-valve\/#Where_API_6D_Ball_Valves_Fit\" >Where API 6D Ball Valves Fit<\/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\/fr\/api-6d-ball-valve\/#Where_Extra_Review_Is_Needed\" >Where Extra Review Is Needed<\/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\/fr\/api-6d-ball-valve\/#API_6D_Ball_Valve_RFQ_Checklist\" >API 6D Ball Valve RFQ Checklist<\/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\/fr\/api-6d-ball-valve\/#Specification_Data_to_Provide\" >Specification Data to Provide<\/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\/fr\/api-6d-ball-valve\/#Documents_to_Request_Before_Ordering\" >Documents to Request Before Ordering<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/ntgdvalve.com\/fr\/api-6d-ball-valve\/#Common_Issues_and_Inspection_Notes\" >Common Issues and Inspection Notes<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/ntgdvalve.com\/fr\/api-6d-ball-valve\/#Leakage_Seat_Damage_and_Packing_Leakage\" >Leakage, Seat Damage and Packing Leakage<\/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\/fr\/api-6d-ball-valve\/#High_Torque_or_Cannot_Open_Close\" >High Torque or Cannot Open \/ Close<\/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\/fr\/api-6d-ball-valve\/#FAQ_About_API_6D_Ball_Valves\" >FAQ About API 6D Ball Valves<\/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\/fr\/api-6d-ball-valve\/#Is_API_6D_only_for_ball_valves\" >Is API 6D only for ball valves?<\/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\/fr\/api-6d-ball-valve\/#What_is_the_difference_between_API_6D_and_API_598\" >What is the difference between API 6D and API 598?<\/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\/fr\/api-6d-ball-valve\/#What_is_the_difference_between_API_6D_and_API_608\" >What is the difference between API 6D and API 608?<\/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\/fr\/api-6d-ball-valve\/#Does_API_6D_include_fire-safe_requirements_automatically\" >Does API 6D include fire-safe requirements automatically?<\/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\/fr\/api-6d-ball-valve\/#Does_an_API_6D_ball_valve_automatically_include_DBB_or_DIB\" >Does an API 6D ball valve automatically include DBB or DIB?<\/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\/fr\/api-6d-ball-valve\/#What_documents_should_be_checked_before_ordering_an_API_6D_ball_valve\" >What documents should be checked before ordering an API 6D ball 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\/fr\/api-6d-ball-valve\/#Do_API_6D_ball_valves_have_standard_dimensions\" >Do API 6D ball valves have standard dimensions?<\/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\/fr\/api-6d-ball-valve\/#How_do_I_choose_between_floating_and_trunnion_mounted_API_6D_ball_valves\" >How do I choose between floating and trunnion mounted API 6D ball valves?<\/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\/fr\/api-6d-ball-valve\/#How_should_I_choose_an_API_6D_ball_valve_manufacturer_or_supplier\" >How should I choose an API 6D ball valve manufacturer or supplier?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/ntgdvalve.com\/fr\/api-6d-ball-valve\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_an_API_6D_Ball_Valve\"><\/span>What Is an API 6D Ball Valve?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>An API 6D ball valve is a quarter-turn shutoff valve used in pipeline service. Inside the valve, a ball with a through bore rotates between the open and closed positions. When the bore is aligned with the pipeline, fluid can pass through the valve. When the ball is rotated about 90 degrees, the solid side of the ball blocks the flow path.<\/p>\n<p>The API 6D part of the name is what separates it from a general-purpose ball valve in a procurement or engineering review. In buyer terms, API 6D means the valve is being considered for pipeline valve service where design control, manufacturing control, pressure testing, documentation, marking, and traceability are part of the purchasing and inspection process.<\/p>\n<p>An API 6D ball valve is typically considered when a pipeline isolation valve must satisfy both mechanical service requirements and project documentation requirements. If a project requires API 6D but a general-purpose ball valve is offered without the required records, the valve may create approval, inspection, or traceability problems even if the basic open-close function appears similar.<\/p>\n<p>An API 6D ball valve may be supplied in different designs, including floating ball, trunnion mounted, side-entry, top-entry, split-body, fully welded, soft-seated, or metal-seated configurations. The correct version depends on line size, pressure class, medium, temperature, operating frequency, shutoff expectation, inspection access, and project documentation requirements.<\/p>\n<p>A useful way to read the product name is:<\/p>\n<table>\n<thead>\n<tr>\n<th>Term<\/th>\n<th>What It Means in Selection<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>API 6D<\/td>\n<td>The valve is being specified under a pipeline valve standard context.<\/td>\n<\/tr>\n<tr>\n<td>Ball valve<\/td>\n<td>The closure member is a rotating ball with a bore through the center.<\/td>\n<\/tr>\n<tr>\n<td>Pipeline service<\/td>\n<td>The valve is usually selected for isolation or shutoff in pipeline or station systems.<\/td>\n<\/tr>\n<tr>\n<td>RFQ confirmation<\/td>\n<td>The final valve must still be confirmed by size, class, bore, material, seat, operation, testing, and documents.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>This means an API 6D ball valve should not be selected only because the keyword appears in a catalog title. The buyer should confirm whether the offered valve design, testing scope, materials, pressure class, documentation package, and certificates match the project requirement.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_API_6D_Means_for_Ball_Valves\"><\/span>What API 6D Means for Ball Valves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/www.api.org\/products-and-services\/standards\/important-standards-announcements\/spec6d\" target=\"_blank\" rel=\"noopener\">API 6D<\/a> is associated with pipeline valves. For ball valves, it affects how the valve is specified, checked, tested, documented, marked, and accepted before delivery. It does not turn every ball valve into a pipeline valve automatically, and it should not be treated as a simple marketing label.<\/p>\n<p>API 6D mainly provides a framework for design, manufacturing, pressure testing, documentation, marking, and traceability in pipeline valve service. Features such as DBB, DIB, fire-safe design, special trim, emergency sealant injection, or sour-service material requirements should be confirmed separately in the project specification and RFQ. They should not be assumed from the API 6D name alone.<\/p>\n<p>For an API 6D ball valve, the buyer normally needs to review several areas:<\/p>\n<table>\n<thead>\n<tr>\n<th>Review Area<\/th>\n<th>What API 6D Means in Buyer Review<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Design basis<\/td>\n<td>The valve construction should support pipeline valve design verification, not only general industrial shutoff service.<\/td>\n<\/tr>\n<tr>\n<td>Pressure class<\/td>\n<td>The pressure rating must align with the piping class, end connection, pressure boundary design, and project approval documents.<\/td>\n<\/tr>\n<tr>\n<td>Bore design<\/td>\n<td>The bore affects flow path, pigging review, pressure drop, and whether the valve matches pipeline operating requirements.<\/td>\n<\/tr>\n<tr>\n<td>Body construction<\/td>\n<td>The body design affects pressure boundary layout, inspection access, body joint sealing, maintenance access, and installation planning.<\/td>\n<\/tr>\n<tr>\n<td>Seat and sealing design<\/td>\n<td>Seat material and sealing design affect shutoff behavior, operating torque, temperature suitability, service compatibility, and acceptance expectations.<\/td>\n<\/tr>\n<tr>\n<td>Testing records<\/td>\n<td>Shell \/ body, seat, and functional test records should be available as part of the delivery or inspection document package.<\/td>\n<\/tr>\n<tr>\n<td>Material traceability<\/td>\n<td>Pressure-containing parts and wetted parts should be traceable to the required material specification and certificate package.<\/td>\n<\/tr>\n<tr>\n<td>Marking and documentation<\/td>\n<td>Nameplate, tag, drawing, datasheet, test report, and inspection records should align with the RFQ and project documentation requirements.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>If testing records, material certificates, marking, or drawing \/ datasheet details are not confirmed early, the project may face document hold, inspection delay, site acceptance questions, or replacement review after the valve has already been manufactured or shipped.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"API_6D_Scope_Ball_Gate_Check_and_Plug_Valves\"><\/span>API 6D Scope: Ball, Gate, Check and Plug Valves<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A common source of confusion is the difference between <strong>API 6D ball valve<\/strong> and <strong>API 6D valves<\/strong>. API 6D can apply to multiple pipeline valve categories, not only ball valves.<\/p>\n<table>\n<thead>\n<tr>\n<th>API 6D Valve Category<\/th>\n<th>Current Page Treatment<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Ball valves<\/td>\n<td>Main focus of this article.<\/td>\n<\/tr>\n<tr>\n<td>Gate valves<\/td>\n<td>Related API 6D valve type, but not the focus here.<\/td>\n<\/tr>\n<tr>\n<td>Check valves<\/td>\n<td>Related API 6D valve type, but not the focus here.<\/td>\n<\/tr>\n<tr>\n<td>Plug valves<\/td>\n<td>Related API 6D valve type, but not the focus here.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure id=\"attachment_10441\" aria-describedby=\"caption-attachment-10441\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-10441\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-scope-boundary-ball-valve-infographic.png\" alt=\"API 6D scope boundary infographic showing ball valves gate valves check valves and plug valves\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-scope-boundary-ball-valve-infographic.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-scope-boundary-ball-valve-infographic-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-scope-boundary-ball-valve-infographic-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-scope-boundary-ball-valve-infographic-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-scope-boundary-ball-valve-infographic-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-10441\" class=\"wp-caption-text\">API 6D covers several pipeline valve categories, while this article focuses on API 6D ball valves.<\/figcaption><\/figure>\n<p>This page focuses on API 6D ball valves only. Broader topics such as API 6D valves as a full category, API 6D plug valves, API 6D gate valves, or API 6D check valves should be handled separately to avoid mixing valve functions and selection logic.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Why_This_Page_Focuses_on_Ball_Valves\"><\/span>Why This Page Focuses on Ball Valves<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ball valves have their own selection questions: floating or trunnion mounted, full bore or reduced bore, soft seated or metal seated, side-entry or top-entry, manual or actuated, and whether the design supports the project\u2019s shutoff and documentation requirements.<\/p>\n<p>Those questions are different from the selection logic for gate valves, check valves, or plug valves. Keeping this page focused on ball valves helps buyers compare the right construction options before sending an RFQ.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_an_API_6D_Ball_Valve_Works_in_Pipeline_Service\"><\/span>How an API 6D Ball Valve Works in Pipeline Service<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>An API 6D ball valve works by rotating a bored ball inside the valve body. In the open position, the ball bore is aligned with the inlet and outlet, allowing flow through the valve. In the closed position, the ball rotates so the bore is perpendicular to the pipeline, and the solid side of the ball blocks the flow path.<\/p>\n<p>The operating torque is transmitted from the handwheel, gearbox, lever, or actuator through the stem to the ball. In larger sizes or higher pressure classes, gearbox or actuator operation is commonly reviewed because direct manual operation may require excessive torque.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Quarter-Turn_Shutoff_and_Flow_Path\"><\/span>Quarter-Turn Shutoff and Flow Path<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The main operating advantage of a ball valve is quarter-turn shutoff. A 90-degree rotation changes the valve from fully open to fully closed. This makes API 6D ball valves useful where quick isolation is needed, but it also means that system design should consider pressure surge, operating procedure, actuator travel time, and closing speed.<\/p>\n<p>In long-distance pipeline service or station isolation, rapid closure may create pressure surge or water hammer risk. For actuated valves, closing time, fail position, control signal, and operating sequence should be reviewed during valve selection instead of left only to commissioning.<\/p>\n<p>In pipeline service, the flow path is especially important. The bore through the ball should match the project requirement. A valve that looks suitable from the outside may still be unsuitable if the bore, seat, end connection, or pressure class does not match the pipeline specification.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Full_Bore_vs_Reduced_Bore\"><\/span>Full Bore vs Reduced Bore<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/ntgdvalve.com\/full-bore-ball-valve\/\">Full bore<\/a> and reduced bore are important RFQ terms for API 6D ball valves.<\/p>\n<table>\n<thead>\n<tr>\n<th>Bore Type<\/th>\n<th>Selection Meaning<\/th>\n<th>Typical Review Point<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Full bore<\/td>\n<td>The bore is close to the pipeline inside diameter, depending on design and specification.<\/td>\n<td>Commonly reviewed when pigging, lower restriction, or pipeline cleaning access is required.<\/td>\n<\/tr>\n<tr>\n<td>Reduced bore<\/td>\n<td>The bore is smaller than the pipeline inside diameter.<\/td>\n<td>May be considered where lower cost, lower weight, or less critical flow restriction is acceptable.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The correct bore type should be listed in the RFQ and confirmed on the datasheet or drawing. It should match the piping class, process requirement, pigging requirement, pressure-drop expectation, and installation envelope.<\/p>\n<figure id=\"attachment_10436\" aria-describedby=\"caption-attachment-10436\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-10436\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-flow-path-bore-review.png\" alt=\"API 6D ball valve flow path and bore review diagram comparing full bore and reduced bore\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-flow-path-bore-review.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-flow-path-bore-review-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-flow-path-bore-review-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-flow-path-bore-review-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-flow-path-bore-review-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-10436\" class=\"wp-caption-text\">Full bore and reduced bore API 6D ball valves should be reviewed according to flow path, pigging and pressure drop requirements.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Main_Types_of_API_6D_Ball_Valves\"><\/span>Main Types of API 6D Ball Valves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>API 6D ball valves can be classified in several ways. A clear classification helps avoid a common RFQ problem: mixing body construction, ball support design, and operation method as if they were the same type of choice.<\/p>\n<p>For selection, API 6D ball valves are usually evaluated in three layers: first the ball support design, then the body construction, and finally the operation method. If these layers are mixed together, a quotation may match the visible valve name but still fail to meet torque, maintenance access, automation, or inspection requirements.<\/p>\n<figure id=\"attachment_10438\" aria-describedby=\"caption-attachment-10438\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-10438\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-type-layers-matrix.png\" alt=\"API 6D ball valve type layers matrix showing ball support body construction and operation method\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-type-layers-matrix.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-type-layers-matrix-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-type-layers-matrix-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-type-layers-matrix-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-type-layers-matrix-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-10438\" class=\"wp-caption-text\">API 6D ball valves are reviewed by ball support, body construction and operation method before RFQ confirmation.<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Floating_vs_Trunnion_Mounted\"><\/span>Floating vs Trunnion Mounted<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The first major selection question is whether the valve uses a floating ball or a trunnion mounted ball.<\/p>\n<table>\n<thead>\n<tr>\n<th>Type<\/th>\n<th>Design Logic<\/th>\n<th>Common Selection Context<\/th>\n<th>Review Caution<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Floating API 6D ball valve<\/td>\n<td>The ball is supported mainly by the seats and moves slightly under pressure to help sealing.<\/td>\n<td>Smaller sizes, moderate pressure ranges, or applications where floating design is suitable for the service.<\/td>\n<td>Torque, seat load, pressure class, bore, and seat material should be verified before final selection.<\/td>\n<\/tr>\n<tr>\n<td>Trunnion mounted API 6D ball valve<\/td>\n<td>The ball is mechanically supported by trunnions, reducing seat load under pressure.<\/td>\n<td>Larger sizes, higher pressure classes, pipeline isolation, and services where operating torque or seat load is a major concern.<\/td>\n<td>Seat design, cavity pressure relief, DBB \/ DIB requirement, actuator sizing, and torque data should be confirmed.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure id=\"attachment_10439\" aria-describedby=\"caption-attachment-10439\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-10439\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-floating-vs-trunnion-mounted-diagram.png\" alt=\"Floating vs trunnion mounted API 6D ball valve comparison diagram showing ball support and torque review\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-floating-vs-trunnion-mounted-diagram.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-floating-vs-trunnion-mounted-diagram-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-floating-vs-trunnion-mounted-diagram-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-floating-vs-trunnion-mounted-diagram-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-floating-vs-trunnion-mounted-diagram-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-10439\" class=\"wp-caption-text\">Floating and trunnion mounted ball valve designs require different torque, seat load and RFQ review.<\/figcaption><\/figure>\n<p><a href=\"https:\/\/ntgdvalve.com\/trunnion-ball-valve-vs-floating-ball-valve-key-differences-explained\/\">Floating and trunnion mounted designs<\/a> should not be selected only by cost. For larger sizes, higher pressure classes, higher differential pressure, or services where operating torque and seat load are critical, trunnion mounted design is commonly reviewed before final RFQ confirmation. The final decision should also consider cavity relief design, bore requirement, actuator sizing, and project documentation.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Side-Entry_Top-Entry_Split-Body_and_Welded_Body\"><\/span>Side-Entry, Top-Entry, Split-Body and Welded Body<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The second major selection question is body construction, especially when buyers need to compare <a href=\"https:\/\/ntgdvalve.com\/top-entry-vs-side-entry-ball-valves-which-is-better-for-your-system\/\">side-entry or top-entry construction<\/a> before RFQ approval.<\/p>\n<table>\n<thead>\n<tr>\n<th>Body Construction<\/th>\n<th>What It Means<\/th>\n<th>Selection Impact<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Side-entry<\/td>\n<td>The valve body is assembled from the side, often with two-piece or three-piece construction.<\/td>\n<td>Common for many pipeline ball valves and can support factory assembly and service access depending on design.<\/td>\n<\/tr>\n<tr>\n<td>Top-entry<\/td>\n<td>Internal parts are accessed from the top of the valve.<\/td>\n<td>Useful where inline maintenance access is considered, but size, design, and project requirements must be verified.<\/td>\n<\/tr>\n<tr>\n<td>Split-body<\/td>\n<td>The body is divided into sections joined by bolting or other construction methods.<\/td>\n<td>Offers assembly flexibility, but body joint sealing, bolting, gasket material, and inspection records should be reviewed.<\/td>\n<\/tr>\n<tr>\n<td>Welded body \/ fully welded body<\/td>\n<td>Body joints are welded rather than bolted in the main pressure boundary.<\/td>\n<td>Often considered where body leakage risk at bolted joints must be minimized, but field repair access may be more limited.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The original article separated side-entry, top-entry, welded body, manual, and actuated designs at the same level. For RFQ review, it is clearer to separate <strong>body construction<\/strong> from <strong>operation method<\/strong>.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Manual_Gearbox_and_Actuated_Operation\"><\/span>Manual, Gearbox and Actuated Operation<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Operation method is another selection layer.<\/p>\n<table>\n<thead>\n<tr>\n<th>Operation Method<\/th>\n<th>Best-Fit Review<\/th>\n<th>Selection Caution<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Lever or handwheel<\/td>\n<td>Small valves or lower torque conditions.<\/td>\n<td>Not suitable when torque is too high or operation must be remote.<\/td>\n<\/tr>\n<tr>\n<td>Gearbox<\/td>\n<td>Larger manual valves where torque reduction is needed.<\/td>\n<td>Gearbox ratio, handwheel orientation, opening direction, and site access should be confirmed.<\/td>\n<\/tr>\n<tr>\n<td>Pneumatic, electric, or hydraulic actuator<\/td>\n<td>Remote operation, automation, emergency shutdown, or control integration.<\/td>\n<td>Actuator torque, fail position, control signal, power source, travel time, and limit switch arrangement should be checked.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For <a href=\"https:\/\/ntgdvalve.com\/actuated-ball-valve\/\">actuated API 6D ball valves<\/a>, the valve and actuator should be reviewed as an assembly. A correct valve body with an undersized actuator can still fail to open or close reliably under actual service conditions.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Key_Components_and_Design_Features_to_Review\"><\/span>Key Components and Design Features to Review<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>An API 6D ball valve uses the same basic component families as other industrial ball valves, but the selection impact is more important in pipeline service. Components should be reviewed as part of the pressure boundary, sealing system, torque path, traceability package, and project documentation.<\/p>\n<figure id=\"attachment_10444\" aria-describedby=\"caption-attachment-10444\" style=\"width: 2560px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-10444\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/ball-valve-trunnion-2pc-24-inch-600lb-4a-assembly-scaled.jpg\" alt=\"Worker assembling a 24 inch Class 600 4A trunnion mounted ball valve in NTGD workshop\" width=\"2560\" height=\"1707\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/ball-valve-trunnion-2pc-24-inch-600lb-4a-assembly-scaled.jpg 2560w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/ball-valve-trunnion-2pc-24-inch-600lb-4a-assembly-768x512.jpg 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/ball-valve-trunnion-2pc-24-inch-600lb-4a-assembly-1536x1024.jpg 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/ball-valve-trunnion-2pc-24-inch-600lb-4a-assembly-2048x1365.jpg 2048w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/ball-valve-trunnion-2pc-24-inch-600lb-4a-assembly-18x12.jpg 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/ball-valve-trunnion-2pc-24-inch-600lb-4a-assembly-600x400.jpg 600w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-10444\" class=\"wp-caption-text\">Assembly work on a 24 inch Class 600 4A trunnion mounted ball valve before final inspection.<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Body_Ball_Seats_Stem_Packing_and_Bonnet\"><\/span>Body, Ball, Seats, Stem, Packing and Bonnet<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<table>\n<thead>\n<tr>\n<th>Component<\/th>\n<th>Function<\/th>\n<th>Selection Impact<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Valve body<\/td>\n<td>Holds the pressure boundary and supports internal parts.<\/td>\n<td>Body material, construction, wall thickness, end connection, and inspection records affect pressure boundary integrity, material traceability, and project material compliance.<\/td>\n<\/tr>\n<tr>\n<td>Ball<\/td>\n<td>Rotating closure element with a bore through the center.<\/td>\n<td>Bore type, coating, surface finish, and surface condition affect sealing behavior, flow path verification, torque, and compatibility with the specified service.<\/td>\n<\/tr>\n<tr>\n<td>Seats<\/td>\n<td>Provide sealing between the ball and body.<\/td>\n<td>Seat material affects shutoff performance, temperature range, operating torque, service compatibility, and whether the offered design matches the RFQ.<\/td>\n<\/tr>\n<tr>\n<td>Stem<\/td>\n<td>Transfers torque from the operator to the ball.<\/td>\n<td>Stem design affects torque transmission, operator connection, external sealing, and whether the valve can operate reliably under the required pressure differential.<\/td>\n<\/tr>\n<tr>\n<td>Packing<\/td>\n<td>Seals around the stem area.<\/td>\n<td>Packing material and gland design affect external leakage risk, site acceptance, operation frequency, and compatibility with temperature and medium.<\/td>\n<\/tr>\n<tr>\n<td>Bonnet \/ gland area<\/td>\n<td>Supports the stem sealing arrangement and operator interface.<\/td>\n<td>Bolting, sealing, access, and assembly design should be reviewed for the selected construction and document package.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure id=\"attachment_10442\" aria-describedby=\"caption-attachment-10442\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-10442\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-component-review-diagram.png\" alt=\"API 6D ball valve component review diagram showing body ball seats stem packing bonnet pressure boundary traceability sealing and torque path\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-component-review-diagram.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-component-review-diagram-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-component-review-diagram-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-component-review-diagram-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-component-review-diagram-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-10442\" class=\"wp-caption-text\">Key API 6D ball valve components should be reviewed for pressure boundary, traceability, sealing and torque path.<\/figcaption><\/figure>\n<p>The material of each wetted and pressure-containing part should be aligned with the medium, pressure, temperature, corrosion risk, and project material specification. Material certificates and traceability should be confirmed before production, inspection, or shipment.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Seat_Design_DBB_DIB_and_Cavity_Pressure_Relief\"><\/span>Seat Design, DBB \/ DIB and Cavity Pressure Relief<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Seat design is one of the most important parts of API 6D ball valve selection. A seat that works well in one service may not be suitable for another service with higher temperature, abrasive particles, pressure cycling, or special shutoff expectations.<\/p>\n<p>Common seat-related review points include:<\/p>\n<table>\n<thead>\n<tr>\n<th>Feature<\/th>\n<th>Why It Matters<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Soft seat<\/td>\n<td>Commonly reviewed for tight shutoff in clean oil, gas, or general pipeline isolation service. Temperature, chemical compatibility, and wear resistance still need confirmation.<\/td>\n<\/tr>\n<tr>\n<td>Metal seat \/ metal-to-metal seat<\/td>\n<td>May be considered for higher temperature, abrasive, or severe service conditions where soft materials may degrade too quickly.<\/td>\n<\/tr>\n<tr>\n<td>DBB \/ DIB requirement<\/td>\n<td>Should be clarified in the project specification because sealing behavior and cavity isolation logic can differ by design.<\/td>\n<\/tr>\n<tr>\n<td>Cavity pressure relief<\/td>\n<td>Important when trapped pressure may develop in the body cavity. The exact method depends on valve design.<\/td>\n<\/tr>\n<tr>\n<td>Emergency sealant injection<\/td>\n<td>May be specified for certain pipeline valves, but it should not be assumed unless included in the design.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><a href=\"https:\/\/ntgdvalve.com\/metal-seated-ball-valves-vs-soft-seated-valves\/\">Soft seats and metal seats<\/a> are often selected under different service conditions: soft seats for clean shutoff duties, and metal seats when temperature, particles, pressure cycling, or severe service conditions may damage soft materials. A metal-seated API 6D ball valve may offer better durability in some severe services, but it may also affect torque and shutoff expectation. This should be specified, tested, and documented clearly.<\/p>\n<p><a href=\"https:\/\/ntgdvalve.com\/understanding-the-differences-between-double-block-and-bleed-dbb-and-double-isolation-bleed-dib-valves\/\">DBB and DIB<\/a>, cavity relief, fire-safe design, and sealant injection should be treated as project-specific specification items, not as automatic features of every API 6D ball valve.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Forged_vs_Cast_Body_Material\"><\/span>Forged vs Cast Body Material<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The term <strong>API 6D forged steel valve<\/strong> may appear in product searches, but for this page it should be understood as a material and construction consideration, not a separate page direction.<\/p>\n<table>\n<thead>\n<tr>\n<th>Body Material \/ Construction<\/th>\n<th>Selection Meaning<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Forged steel body<\/td>\n<td>Often reviewed for higher-pressure, compact, or specific pipeline valve designs where the project requires forged material construction.<\/td>\n<\/tr>\n<tr>\n<td>Cast steel body<\/td>\n<td>Common in many industrial valve designs, depending on size, pressure class, material grade, and manufacturer design.<\/td>\n<\/tr>\n<tr>\n<td>Low-temperature carbon steel<\/td>\n<td>May be reviewed for low-temperature pipeline or gas service.<\/td>\n<\/tr>\n<tr>\n<td>Stainless steel or alloy material<\/td>\n<td>Considered when corrosion resistance or specific medium compatibility is required.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>When comparing <a href=\"https:\/\/ntgdvalve.com\/difference-between-cast-steel-valves-and-forged-steel-valves\/\">cast and forged steel valve construction<\/a>, forged steel bodies are often reviewed for higher-pressure or compact pipeline valve designs, but the final material choice must follow the project material specification, pressure class, temperature range, corrosion requirement, and documentation package.<\/p>\n<p>A forged body should not be treated as automatically better for every API 6D ball valve application.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Testing_Inspection_and_Documentation_to_Confirm\"><\/span>Testing, Inspection and Documentation to Confirm<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Testing and documentation are major reasons buyers search for API 6D ball valves instead of ordinary ball valves. The purchasing decision should not stop at the product name. The offered valve should be supported by inspection records and documents that match the project requirement.<\/p>\n<figure id=\"attachment_10437\" aria-describedby=\"caption-attachment-10437\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-10437\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-testing-documentation-review.png\" alt=\"API 6D ball valve testing and documentation review workflow with RFQ ITP material certificate pressure test report dimensional record nameplate and final review\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-testing-documentation-review.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-testing-documentation-review-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-testing-documentation-review-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-testing-documentation-review-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-testing-documentation-review-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-10437\" class=\"wp-caption-text\">API 6D ball valve testing and documentation review should connect RFQ, ITP, certificates, test reports, dimensional records and final review.<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Pressure_Seat_and_Functional_Test_Records\"><\/span>Pressure, Seat and Functional Test Records<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>For RFQ and pre-shipment review, buyers commonly need to confirm whether the manufacturer can provide records for the required <a href=\"https:\/\/ntgdvalve.com\/pressure-test-methods-for-various-industrial-valves\/\">pressure and functional tests<\/a>.<\/p>\n<p>The exact test scope, acceptance basis, and inspection witness requirements should be aligned with the project specification, inspection and test plan, and applicable standard documents.<\/p>\n<table>\n<thead>\n<tr>\n<th>Confirmation Item<\/th>\n<th>Buyer Review Question<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Shell \/ body pressure test record<\/td>\n<td>Does the report identify the valve, test medium, test pressure, test duration, acceptance basis, and pressure boundary tested?<\/td>\n<\/tr>\n<tr>\n<td>Seat test record<\/td>\n<td>Does the record show the tested seat direction, sealing requirement, inspection requirement, and valve identification?<\/td>\n<\/tr>\n<tr>\n<td>Functional test<\/td>\n<td>Does the record confirm opening \/ closing, position indication, stroke or travel, and operation under the required arrangement?<\/td>\n<\/tr>\n<tr>\n<td>Torque record or actuator sizing data<\/td>\n<td>Does the data reflect pressure differential, seat design, operation method, and actuator safety margin where applicable?<\/td>\n<\/tr>\n<tr>\n<td>Inspection hold point<\/td>\n<td>Does the ITP define whether client witness, third-party inspection, or specific hold points are required before shipment?<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>A detailed test procedure must be confirmed from the manufacturer\u2019s ITP, project specification, purchase order, and <a href=\"https:\/\/www.api.org\/products-and-services\/standards\" target=\"_blank\" rel=\"noopener\">applicable standard documents<\/a>.<\/p>\n<figure id=\"attachment_10445\" aria-describedby=\"caption-attachment-10445\" style=\"width: 2560px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-10445\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/ball-valve-trunnion-2pc-18-inch-600lb-4a-pressure-testing-scaled.jpg\" alt=\"18 inch Class 600 4A trunnion mounted ball valve during pressure testing\" width=\"2560\" height=\"1707\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/ball-valve-trunnion-2pc-18-inch-600lb-4a-pressure-testing-scaled.jpg 2560w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/ball-valve-trunnion-2pc-18-inch-600lb-4a-pressure-testing-768x512.jpg 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/ball-valve-trunnion-2pc-18-inch-600lb-4a-pressure-testing-1536x1024.jpg 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/ball-valve-trunnion-2pc-18-inch-600lb-4a-pressure-testing-2048x1366.jpg 2048w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/ball-valve-trunnion-2pc-18-inch-600lb-4a-pressure-testing-18x12.jpg 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/ball-valve-trunnion-2pc-18-inch-600lb-4a-pressure-testing-600x400.jpg 600w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-10445\" class=\"wp-caption-text\">18 inch Class 600 4A trunnion mounted ball valve during pressure testing before delivery review.<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Material_Certificates_Traceability_and_Inspection_Records\"><\/span>Material Certificates, Traceability and Inspection Records<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Documentation is often as important as the valve body itself. If the project requires API 6D ball valves, buyers should confirm the document package early, not after production is complete.<\/p>\n<p>Common document checks include:<\/p>\n<table>\n<thead>\n<tr>\n<th>Document \/ Record<\/th>\n<th>Why It Matters<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Material certificate<\/td>\n<td>Verifies material grade for pressure-containing and wetted parts.<\/td>\n<\/tr>\n<tr>\n<td>Inspection and test plan<\/td>\n<td>Shows planned inspection steps, witness points, and hold points.<\/td>\n<\/tr>\n<tr>\n<td>Pressure test report<\/td>\n<td>Supports acceptance of pressure boundary and sealing tests.<\/td>\n<\/tr>\n<tr>\n<td>Dimensional inspection record<\/td>\n<td>Helps verify size, end connection, face-to-face dimension, bore, and drawing requirements.<\/td>\n<\/tr>\n<tr>\n<td>Coating \/ painting report<\/td>\n<td>May be required for pipeline, buried, offshore, or outdoor installation conditions.<\/td>\n<\/tr>\n<tr>\n<td>Marking and nameplate information<\/td>\n<td>Helps match valve identity with datasheet, tag number, project records, and receiving inspection.<\/td>\n<\/tr>\n<tr>\n<td>Drawing and datasheet<\/td>\n<td>Confirms construction, bore, pressure class, material, seat, operation, accessories, and envelope dimensions.<\/td>\n<\/tr>\n<tr>\n<td>IOM document<\/td>\n<td>Supports installation, operation, commissioning, and maintenance review.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>If these records are not confirmed before shipment, the valve may pass mechanical review but still face document hold, receiving inspection delay, or site acceptance questions.<\/p>\n<p>If the required documents are unclear, the RFQ should state them directly. Otherwise, the supplier may provide a valve that is mechanically suitable but incomplete for project documentation approval.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Applications_Fit_and_Selection_Limits\"><\/span>Applications, Fit and Selection Limits<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>API 6D ball valves are commonly used for shutoff and isolation in pipeline-related systems. Their role is usually to provide reliable open \/ closed service rather than throttling.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Where_API_6D_Ball_Valves_Fit\"><\/span>Where API 6D Ball Valves Fit<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Typical application areas include:<\/p>\n<table>\n<thead>\n<tr>\n<th>Application Area<\/th>\n<th>Why API 6D Ball Valves Are Reviewed<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Oil and gas pipelines<\/td>\n<td>Isolation, sectional shutoff, and pipeline operation requirements.<\/td>\n<\/tr>\n<tr>\n<td>Gas transmission and distribution<\/td>\n<td>Shutoff reliability, pressure class, and documentation control.<\/td>\n<\/tr>\n<tr>\n<td>Petrochemical pipeline systems<\/td>\n<td>Compatibility with project piping class and inspection documents.<\/td>\n<\/tr>\n<tr>\n<td>Pump and compressor stations<\/td>\n<td>Isolation around equipment, station piping, and maintenance boundaries.<\/td>\n<\/tr>\n<tr>\n<td>Metering and terminal systems<\/td>\n<td>Positive isolation and specification traceability.<\/td>\n<\/tr>\n<tr>\n<td>Storage and loading systems<\/td>\n<td>Shutoff duty where valve documentation and material verification are important.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The valve should be reviewed according to the actual service medium, pressure, temperature, installation orientation, operating duty, operation frequency, and inspection requirement.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Where_Extra_Review_Is_Needed\"><\/span>Where Extra Review Is Needed<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>An API 6D ball valve is not automatically the correct choice for every severe service condition. Extra review is needed when the service includes <a href=\"https:\/\/ntgdvalve.com\/what-are-the-best-valves-for-slurry-applications\/\">abrasive or slurry service<\/a> conditions:<\/p>\n<table>\n<thead>\n<tr>\n<th>Condition<\/th>\n<th>Why Extra Review Is Needed<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Abrasive particles or dirty media<\/td>\n<td>Seat material, ball coating, and media cleanliness should be reviewed to reduce early seat damage or leakage risk.<\/td>\n<\/tr>\n<tr>\n<td>High temperature<\/td>\n<td>Seat material, packing, stem seal, and body material must be checked for the operating temperature range.<\/td>\n<\/tr>\n<tr>\n<td>Sour gas or corrosive service<\/td>\n<td>Material compatibility, corrosion allowance, and project-specific material requirements must be verified.<\/td>\n<\/tr>\n<tr>\n<td>Frequent operation<\/td>\n<td>Torque, seat wear, actuator sizing, and maintenance access become more important.<\/td>\n<\/tr>\n<tr>\n<td>Fire-safe requirement<\/td>\n<td>Fire-safe design and fire test documentation should be confirmed separately in the project specification.<\/td>\n<\/tr>\n<tr>\n<td>Pigging requirement<\/td>\n<td>Full bore design, end connection, and internal geometry must be reviewed before approval.<\/td>\n<\/tr>\n<tr>\n<td>Rapid closure risk<\/td>\n<td>Operating procedure, actuator travel time, and closing speed may affect pressure surge or water hammer risk.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>API 6D ball valves are primarily selected for on-off isolation duty. They should not be treated as continuous throttling or flow regulation valves. If the service requires frequent modulation, stable control, or precise flow regulation, another valve type or control valve solution may need review.<\/p>\n<p>The main selection rule is simple: API 6D gives a specification context, but the final valve still needs a project-specific service review.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"API_6D_Ball_Valve_RFQ_Checklist\"><\/span>API 6D Ball Valve RFQ Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A clear RFQ helps prevent wrong valve offers. For API 6D ball valves, the buyer should provide enough information for the manufacturer to confirm valve design, material, testing, and documents.<\/p>\n<figure id=\"attachment_10440\" aria-describedby=\"caption-attachment-10440\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-10440\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-rfq-checklist.png\" alt=\"API 6D ball valve RFQ checklist with size class bore end connection material testing records MTR and drawing\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-rfq-checklist.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-rfq-checklist-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-rfq-checklist-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-rfq-checklist-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2022\/04\/api-6d-ball-valve-rfq-checklist-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-10440\" class=\"wp-caption-text\">API 6D ball valve RFQs should confirm size, class, bore, material, seat design, testing records, MTR and drawings.<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Specification_Data_to_Provide\"><\/span>Specification Data to Provide<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<table>\n<thead>\n<tr>\n<th>RFQ Item<\/th>\n<th>What to Specify<\/th>\n<th>Why It Matters<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Valve type<\/td>\n<td>API 6D ball valve, floating or trunnion mounted if known<\/td>\n<td>Prevents wrong valve family selection and helps the supplier start with the correct design route.<\/td>\n<\/tr>\n<tr>\n<td>Size<\/td>\n<td>NPS \/ DN<\/td>\n<td>Affects body design, bore, face-to-face dimension, actuator envelope, drawing approval, torque, and end connection.<\/td>\n<\/tr>\n<tr>\n<td>Pressure class<\/td>\n<td><a href=\"https:\/\/www.asme.org\/codes-standards\/find-codes-standards\/b16-34-valves-flanged-threaded-welding-end\" target=\"_blank\" rel=\"noopener\">ASME Class<\/a> or project pressure rating<\/td>\n<td>Drives pressure boundary design, flange \/ end connection compatibility, and pressure test record review.<\/td>\n<\/tr>\n<tr>\n<td>Bore<\/td>\n<td>Full bore or reduced bore<\/td>\n<td>Affects pigging, pressure drop, flow path, and pipeline cleaning access.<\/td>\n<\/tr>\n<tr>\n<td>End connection<\/td>\n<td>RF flange, RTJ flange, butt weld, or other required end<\/td>\n<td>Must match pipeline connection, piping class, and installation requirements.<\/td>\n<\/tr>\n<tr>\n<td>Body material<\/td>\n<td>WCB, A105, LF2, stainless steel, or project-specified material<\/td>\n<td>Affects pressure boundary suitability, service compatibility, material certificate review, and traceability.<\/td>\n<\/tr>\n<tr>\n<td>Ball and seat material<\/td>\n<td>Soft seat, metal seat, coating, or special material<\/td>\n<td>Affects sealing, temperature range, operating torque, test expectations, and service life.<\/td>\n<\/tr>\n<tr>\n<td>Operation method<\/td>\n<td>Lever, gearbox, pneumatic, electric, or hydraulic actuator<\/td>\n<td>Affects torque, automation, fail position, control interface, and site operation.<\/td>\n<\/tr>\n<tr>\n<td>Medium<\/td>\n<td>Oil, gas, water, chemical, sour gas, or other service<\/td>\n<td>Drives material, seat, packing, coating, and corrosion review.<\/td>\n<\/tr>\n<tr>\n<td>Temperature<\/td>\n<td>Minimum and maximum operating temperature<\/td>\n<td>Affects seat, packing, stem sealing, body material, and actuator selection.<\/td>\n<\/tr>\n<tr>\n<td>Pipeline requirement<\/td>\n<td>Pigging, DBB \/ DIB, cavity relief, fire-safe, anti-static, or other requirements<\/td>\n<td>Clarifies project-specific design features before quotation.<\/td>\n<\/tr>\n<tr>\n<td>Standard and documentation<\/td>\n<td>API 6D requirement, test reports, MTR, ITP, drawings, IOM, certificates<\/td>\n<td>Confirms the offered valve and document package match the specified API 6D ball valve standard and project approval process.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The RFQ does not need to become a product catalog. It needs to give enough project data for the manufacturer to confirm the correct API 6D ball valve configuration before quotation, drawing approval, production, inspection, and shipment.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Documents_to_Request_Before_Ordering\"><\/span>Documents to Request Before Ordering<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>For many buyers, the search term <strong>API 6D ball valve PDF<\/strong> does not mean they only need a downloadable file. In procurement practice, it usually means they need technical documents that can be checked before ordering.<\/p>\n<p>Common documents to request include:<\/p>\n<table>\n<thead>\n<tr>\n<th>Document<\/th>\n<th>When to Request It<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Datasheet<\/td>\n<td>Before technical approval.<\/td>\n<\/tr>\n<tr>\n<td>General arrangement drawing<\/td>\n<td>Before dimensional and piping review.<\/td>\n<\/tr>\n<tr>\n<td>Material certificate<\/td>\n<td>Before final acceptance or inspection.<\/td>\n<\/tr>\n<tr>\n<td>Pressure test report<\/td>\n<td>Before shipment or document handover.<\/td>\n<\/tr>\n<tr>\n<td>Inspection and test plan<\/td>\n<td>Before production or witness inspection.<\/td>\n<\/tr>\n<tr>\n<td>IOM manual<\/td>\n<td>Before installation and commissioning review.<\/td>\n<\/tr>\n<tr>\n<td>Nameplate \/ marking confirmation<\/td>\n<td>Before delivery or receiving inspection.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>If a project requires special documents, inspection witness, third-party inspection, or additional testing, those items should be written into the RFQ instead of assumed later.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Common_Issues_and_Inspection_Notes\"><\/span>Common Issues and Inspection Notes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Common field performance issues with API 6D ball valves are often linked to specification mismatch, unsuitable material or seat selection, debris control, actuator sizing, or incomplete inspection, not only component wear. This section should be used as a selection and inspection review aid, not as a repair manual.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Leakage_Seat_Damage_and_Packing_Leakage\"><\/span>Leakage, Seat Damage and Packing Leakage<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<table>\n<thead>\n<tr>\n<th>Issue<\/th>\n<th>Selection \/ Inspection Review Direction<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Leakage through the seat<\/td>\n<td>Review whether seat material, media cleanliness, ball surface condition, pressure \/ temperature range, or debris control was suitable for the service.<\/td>\n<\/tr>\n<tr>\n<td>Leakage at the body gasket<\/td>\n<td>Review body joint design, gasket material, bolting condition, pressure boundary records, and whether the body construction matches the service requirement.<\/td>\n<\/tr>\n<tr>\n<td>Leakage around the stem packing<\/td>\n<td>Review packing material, gland arrangement, stem surface, operating frequency, temperature range, and external leakage acceptance requirement.<\/td>\n<\/tr>\n<tr>\n<td>Repeated sealing problems<\/td>\n<td>Review seat selection, medium cleanliness, pressure cycling, temperature range, actuator setting, and whether the valve design fits the actual operating duty.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For critical service, repair decisions should follow the manufacturer\u2019s IOM document and site safety procedure. A field adjustment should not be used to hide a valve selection, actuator sizing, or documentation problem.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"High_Torque_or_Cannot_Open_Close\"><\/span>High Torque or Cannot Open \/ Close<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>High torque or failure to open \/ close may come from several causes:<\/p>\n<table>\n<thead>\n<tr>\n<th>Symptom<\/th>\n<th>Selection \/ Inspection Review Direction<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Valve is hard to operate<\/td>\n<td>Review pressure differential, seat load, gearbox sizing, stem alignment, debris, and whether the selected seat design creates higher torque than expected.<\/td>\n<\/tr>\n<tr>\n<td>Actuated valve does not respond<\/td>\n<td>Review actuator sizing, air or power supply, control signal, fail position, torque setting, travel limit, and valve obstruction.<\/td>\n<\/tr>\n<tr>\n<td>Valve cannot fully close<\/td>\n<td>Review debris, seat damage, ball damage, wrong operation setting, actuator stroke limit, or mismatched seat material for the service.<\/td>\n<\/tr>\n<tr>\n<td>Valve cannot fully open<\/td>\n<td>Review mechanical stop, actuator travel, stem connection, internal obstruction, and whether the operation method is suitable for the installed condition.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The correct response depends on valve design and service condition. For pipeline service, inspection and isolation procedures should be followed before disassembly or maintenance.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ_About_API_6D_Ball_Valves\"><\/span>FAQ About API 6D Ball Valves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Is_API_6D_only_for_ball_valves\"><\/span>Is API 6D only for ball valves?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. API 6D can apply to several pipeline valve categories, including ball, gate, check, and plug valves. This article focuses only on API 6D ball valves because ball valves have their own selection logic, such as floating vs trunnion, full bore vs reduced bore, seat design, body construction, and operation method.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_difference_between_API_6D_and_API_598\"><\/span>What is the difference between API 6D and API 598?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>API 6D is associated with pipeline valve specification requirements, while <a href=\"https:\/\/www.api.org\/~\/media\/files\/publications\/2018_catalog\/2018_pubs_catalog_final_rf.pdf\" target=\"_blank\" rel=\"noopener\">API 598<\/a> is commonly associated with valve inspection and testing. They should not be treated as interchangeable. The exact requirement should be confirmed from the project specification, purchase order, and applicable standard documents.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_difference_between_API_6D_and_API_608\"><\/span>What is the difference between API 6D and API 608?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>API 6D is generally used for pipeline valve service, while API 608 is associated with certain metal ball valves for general industrial service. The correct standard depends on the project specification and service conditions. A buyer should not replace one standard with the other without engineering confirmation.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Does_API_6D_include_fire-safe_requirements_automatically\"><\/span>Does API 6D include fire-safe requirements automatically?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A <a href=\"https:\/\/ntgdvalve.com\/api607-vs-api6fa-comparing-fire-safety-for-industrial-valves\/\">fire-safe requirement<\/a> should be confirmed separately in the project specification. Some API 6D ball valves may also be supplied with fire-safe design or related fire test documentation, but this should not be assumed from the API 6D name alone.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Does_an_API_6D_ball_valve_automatically_include_DBB_or_DIB\"><\/span>Does an API 6D ball valve automatically include DBB or DIB?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. DBB, DIB, cavity pressure relief, and emergency sealant injection depend on the valve design and project specification. If these functions are required, they should be listed clearly in the RFQ and confirmed on the datasheet, drawing, and test documentation.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_documents_should_be_checked_before_ordering_an_API_6D_ball_valve\"><\/span>What documents should be checked before ordering an API 6D ball valve?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Common documents include the datasheet, drawing, material certificate, pressure test report, inspection and test plan, IOM manual, and nameplate \/ marking confirmation. For project work, the required document package should be listed in the RFQ.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Do_API_6D_ball_valves_have_standard_dimensions\"><\/span>Do API 6D ball valves have standard dimensions?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Dimensions depend on size, pressure class, end connection, bore type, body construction, and manufacturer design. Buyers should confirm the valve drawing, face-to-face dimension, end connection, bore, actuator envelope, and installation clearance before approval.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_do_I_choose_between_floating_and_trunnion_mounted_API_6D_ball_valves\"><\/span>How do I choose between floating and trunnion mounted API 6D ball valves?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Floating design may be reviewed when size, pressure, torque, and service severity are moderate and the seat design fits the duty. Trunnion mounted design is commonly reviewed when size, pressure class, differential pressure, operating torque, or seat load becomes critical. The final decision should follow torque data, bore requirement, seat design, actuator sizing, and project specification.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_should_I_choose_an_API_6D_ball_valve_manufacturer_or_supplier\"><\/span>How should I choose an API 6D ball valve manufacturer or supplier?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>For <a href=\"https:\/\/ntgdvalve.com\/top-10-ball-valve-manufacturers-for-oil-and-gas-in-2025\/\">oil and gas ball valve supplier selection<\/a>, an API 6D ball valve manufacturer or supplier should be evaluated by technical capability, valve design range, material traceability, pressure testing ability, drawing support, documentation control, inspection coordination, and RFQ response quality. Price is only one part of the decision. For pipeline service, document completeness and specification matching are often just as important as the valve itself.<\/p>\n<p><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Is API 6D only for ball valves?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. API 6D can apply to several pipeline valve categories, including ball, gate, check, and plug valves. This article focuses only on API 6D ball valves because ball valves have their own selection logic, such as floating vs trunnion, full bore vs reduced bore, seat design, body construction, and operation method.\"}},{\"@type\":\"Question\",\"name\":\"What is the difference between API 6D and API 598?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"API 6D is associated with pipeline valve specification requirements, while API 598 is commonly associated with valve inspection and testing. They should not be treated as interchangeable. The exact requirement should be confirmed from the project specification, purchase order, and applicable standard documents.\"}},{\"@type\":\"Question\",\"name\":\"What is the difference between API 6D and API 608?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"API 6D is generally used for pipeline valve service, while API 608 is associated with certain metal ball valves for general industrial service. The correct standard depends on the project specification and service conditions. A buyer should not replace one standard with the other without engineering confirmation.\"}},{\"@type\":\"Question\",\"name\":\"Does API 6D include fire-safe requirements automatically?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A fire-safe requirement should be confirmed separately in the project specification. Some API 6D ball valves may also be supplied with fire-safe design or related fire test documentation, but this should not be assumed from the API 6D name alone.\"}},{\"@type\":\"Question\",\"name\":\"Does an API 6D ball valve automatically include DBB or DIB?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. DBB, DIB, cavity pressure relief, and emergency sealant injection depend on the valve design and project specification. If these functions are required, they should be listed clearly in the RFQ and confirmed on the datasheet, drawing, and test documentation.\"}},{\"@type\":\"Question\",\"name\":\"What documents should be checked before ordering an API 6D ball valve?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Common documents include the datasheet, drawing, material certificate, pressure test report, inspection and test plan, IOM manual, and nameplate or marking confirmation. For project work, the required document package should be listed in the RFQ.\"}},{\"@type\":\"Question\",\"name\":\"Do API 6D ball valves have standard dimensions?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Dimensions depend on size, pressure class, end connection, bore type, body construction, and manufacturer design. Buyers should confirm the valve drawing, face-to-face dimension, end connection, bore, actuator envelope, and installation clearance before approval.\"}},{\"@type\":\"Question\",\"name\":\"How do I choose between floating and trunnion mounted API 6D ball valves?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Floating design may be reviewed when size, pressure, torque, and service severity are moderate and the seat design fits the duty. Trunnion mounted design is commonly reviewed when size, pressure class, differential pressure, operating torque, or seat load becomes critical. The final decision should follow torque data, bore requirement, seat design, actuator sizing, and project specification.\"}},{\"@type\":\"Question\",\"name\":\"How should I choose an API 6D ball valve manufacturer or supplier?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"An API 6D ball valve manufacturer or supplier should be evaluated by technical capability, valve design range, material traceability, pressure testing ability, drawing support, documentation control, inspection coordination, and RFQ response quality. Price is only one part of the decision. For pipeline service, document completeness and specification matching are often just as important as the valve itself.\"}}]}<\/script><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>An API 6D ball valve should be selected as a pipeline-service shutoff valve, not as a generic ball valve with a standard name added to it. The key review points are valve type, bore design, body construction, material, seat design, operation method, testing records, inspection documents, and RFQ clarity.<\/p>\n<p>For most buyers, a more reliable technical review path is to confirm the service conditions first, then check floating vs trunnion design, full bore vs reduced bore, side-entry or top-entry construction, seat material, actuator requirement, testing scope, and documentation package. Broader API 6D valve topics, standard comparisons, and adjacent valve types should be handled separately so the API 6D ball valve specification remains clear.<\/p>\n<div class=\"ntgd-cta-box\">\n<p><strong>Need help reviewing an API 6D ball valve RFQ?<\/strong><\/p>\n<p>Specification mismatches and incomplete document packages are common causes of API 6D ball valve approval delays. If you are preparing an RFQ for API 6D ball valves, send the valve size, pressure class, bore requirement, body material, seat design, end connection, operation method, service medium, temperature range, and required documents.<\/p>\n<p>NTGD Valve can help review the specification before quotation so the offered valve matches the project requirement, testing expectation, and document package.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>An API 6D ball valve is a pipeline-service shutoff valve specified when testing records, material traceability, documentation and RFQ verification matter. This guide explains types, bore options, design features, inspection documents and selection limits.<\/p>","protected":false},"author":2,"featured_media":10440,"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-2834","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"_links":{"self":[{"href":"https:\/\/ntgdvalve.com\/fr\/wp-json\/wp\/v2\/posts\/2834","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ntgdvalve.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ntgdvalve.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ntgdvalve.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ntgdvalve.com\/fr\/wp-json\/wp\/v2\/comments?post=2834"}],"version-history":[{"count":0,"href":"https:\/\/ntgdvalve.com\/fr\/wp-json\/wp\/v2\/posts\/2834\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ntgdvalve.com\/fr\/wp-json\/wp\/v2\/media\/10440"}],"wp:attachment":[{"href":"https:\/\/ntgdvalve.com\/fr\/wp-json\/wp\/v2\/media?parent=2834"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ntgdvalve.com\/fr\/wp-json\/wp\/v2\/categories?post=2834"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ntgdvalve.com\/fr\/wp-json\/wp\/v2\/tags?post=2834"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}