{"id":18509,"date":"2025-07-23T10:04:07","date_gmt":"2025-07-23T10:04:07","guid":{"rendered":"https:\/\/oudianvalve.com\/?p=18509"},"modified":"2025-07-23T10:06:25","modified_gmt":"2025-07-23T10:06:25","slug":"gate-valves-introduction-types-applicable-codes-and-standards","status":"publish","type":"post","link":"https:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/","title":{"rendered":"Gate Valves: Introduction, Types, Applicable Codes, and Standards"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 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: #999;color:#999\" 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: #999;color:#999\" 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-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/#Gate_Valves_Introduction_Types_Applicable_Codes_and_Standards\" >Gate Valves: Introduction, Types, Applicable Codes, and Standards<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/#1_Introduction_to_Gate_Valves\" >1. Introduction to Gate Valves<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/#Key_Features\" >Key Features:<\/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:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/#2_Types_of_Gate_Valves\" >2. Types of Gate Valves<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/#A_Disc_Gate_Design\" >A. Disc (Gate) Design<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/#B_Stem_Movement\" >B. Stem Movement<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/#C_Bonnet_Design\" >C. Bonnet Design<\/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:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/#3_Applicable_Codes_and_Standards\" >3. Applicable Codes and Standards<\/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:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/#API_American_Petroleum_Institute\" >API (American Petroleum Institute)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/#ASME_American_Society_of_Mechanical_Engineers\" >ASME (American Society of Mechanical Engineers)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/#ISO_International_Organization_for_Standardization\" >ISO (International Organization for Standardization)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/#MSS_Manufacturers_Standardization_Society\" >MSS (Manufacturers Standardization Society)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/#AWWA_American_Water_Works_Association\" >AWWA (American Water Works Association)<\/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:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/#4_Applications_of_Gate_Valves\" >4. Applications of Gate Valves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/oudianvalve.com\/it\/2025\/07\/gate-valves-introduction-types-applicable-codes-and-standards\/#Conclusion\" >Conclusione<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1><span class=\"ez-toc-section\" id=\"Gate_Valves_Introduction_Types_Applicable_Codes_and_Standards\"><\/span><strong>Gate Valves: Introduction, Types, Applicable Codes, and Standards<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n<h2><span class=\"ez-toc-section\" id=\"1_Introduction_to_Gate_Valves\"><\/span><strong>1. Introduction to Gate Valves<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\">Gate valves are linear motion valves primarily used to start or stop fluid flow in a pipeline. They are not designed for throttling purposes, as partial opening can cause erosion and vibration. Instead, they are ideal for fully open or fully closed applications.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Key_Features\"><\/span><strong>Key Features:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>On\/Off Service:<\/strong>\u00a0Designed for isolation rather than flow control.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Low Pressure Drop:<\/strong>\u00a0When fully open, the flow path is straight, minimizing pressure loss.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Bidirectional Flow:<\/strong>\u00a0Can handle flow in either direction.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Slow Operation:<\/strong>\u00a0Requires multiple turns to open or close, reducing water hammer effects.<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"2_Types_of_Gate_Valves\"><\/span><strong>2. Types of Gate Valves<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\">Gate valves are classified based on:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"A_Disc_Gate_Design\"><\/span><strong>A. Disc (Gate) Design<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol start=\"1\">\n<li>\n<p class=\"ds-markdown-paragraph\"><a href=\"https:\/\/www.stvvalves.com\/wholesale\/gate-valve\/forged-steel-gate-valve\/\"><strong>Solid Wedge Gate Valve<\/strong><\/a><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Most common type, suitable for most fluids (liquids, gases, slurries).<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Robust but prone to thermal binding in high-temperature applications.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><a href=\"https:\/\/www.stvvalves.com\/wholesale\/gate-valve\/cast-steel-gate-valve\/\"><strong>Flexible Wedge Gate Valve<\/strong><\/a><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Has a cut around the perimeter to allow slight flexibility.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Reduces thermal binding risk in steam\/hot fluid applications.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Split Wedge (Parallel Disc) Gate Valve<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Two discs forced outward against seats by a spreader mechanism.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Good for non-condensing gases and corrosive liquids.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Knife Gate Valve<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Thin, sharp-edged gate for thick fluids, slurries, and viscous media.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Used in pulp &amp; paper, wastewater, and mining industries.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"B_Stem_Movement\"><\/span><strong>B. Stem Movement<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol start=\"1\">\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Rising Stem (OS&amp;Y &#8211; Outside Screw &amp; Yoke)<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Stem moves up\/down while the handwheel remains stationary.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Visual indication of valve position.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Non-Rising Stem (NRS)<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Stem rotates but does not move vertically.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Used where vertical space is limited.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"C_Bonnet_Design\"><\/span><strong>C. Bonnet Design<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol start=\"1\">\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Bolted Bonnet<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Common for high-pressure applications.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Requires gaskets for sealing.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Pressure-Seal Bonnet<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Used in high-pressure, high-temperature applications (e.g., power plants).<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\">Sealing improves as internal pressure increases.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Welded Bonnet<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Permanent sealing, used where leakage prevention is critical.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Screw-in Bonnet<\/strong><\/p>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\">Simple and economical, used in small valves.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"3_Applicable_Codes_and_Standards\"><\/span><strong>3. Applicable Codes and Standards<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\">Gate valves must comply with industry standards to ensure safety, reliability, and interchangeability. Some key standards include:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"API_American_Petroleum_Institute\"><\/span><strong>API (American Petroleum Institute)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>API 600<\/strong>\u00a0\u2013 Steel gate valves (bolted bonnet, pressure seal).<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>API 602<\/strong>\u00a0\u2013 Compact steel gate valves (for small sizes).<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>API 603<\/strong>\u00a0\u2013 Corrosion-resistant gate valves (stainless steel).<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>API 6D<\/strong>\u00a0\u2013 Pipeline valves (for oil &amp; gas transmission).<\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"ASME_American_Society_of_Mechanical_Engineers\"><\/span><strong>ASME (American Society of Mechanical Engineers)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>ASME B16.34<\/strong>\u00a0\u2013 Valve design, pressure-temperature ratings.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>ASME B16.10<\/strong>\u00a0\u2013 Face-to-face dimensions of valves.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>ASME B16.5 \/ B16.47<\/strong>\u00a0\u2013 Flange standards for valve connections.<\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"ISO_International_Organization_for_Standardization\"><\/span><strong>ISO (International Organization for Standardization)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>ISO 10434<\/strong>\u00a0\u2013 Bolted bonnet steel gate valves.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>ISO 14313 (API 6D equivalent)<\/strong>\u00a0\u2013 Pipeline valves.<\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"MSS_Manufacturers_Standardization_Society\"><\/span><strong>MSS (Manufacturers Standardization Society)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>MSS SP-70<\/strong>\u00a0\u2013 Cast iron gate valves.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>MSS SP-80<\/strong>\u00a0\u2013 Bronze gate valves.<\/p>\n<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"AWWA_American_Water_Works_Association\"><\/span><strong>AWWA (American Water Works Association)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>AWWA C500<\/strong>\u00a0\u2013 Metal-seated gate valves for water supply.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>AWWA C509<\/strong>\u00a0\u2013 Resilient-seated gate valves for water.<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"4_Applications_of_Gate_Valves\"><\/span><strong>4. Applications of Gate Valves<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Oil &amp; Gas:<\/strong>\u00a0Pipeline isolation, refineries.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Water &amp; Wastewater:<\/strong>\u00a0Treatment plants, distribution systems.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Power Plants:<\/strong>\u00a0Steam, cooling water systems.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Chemical &amp; Petrochemical:<\/strong>\u00a0Corrosive fluid handling.<\/p>\n<\/li>\n<li>\n<p class=\"ds-markdown-paragraph\"><strong>Marine &amp; Shipbuilding:<\/strong>\u00a0Seawater, fuel lines.<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong>Conclusione<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p class=\"ds-markdown-paragraph\">Gate valves are essential for isolation in various industries. Their selection depends on design type, material, pressure-temperature requirements, and compliance with relevant standards. Proper maintenance ensures long-term reliability.<\/p>","protected":false},"excerpt":{"rendered":"<p>Gate Valves: Introduction, Types, Applicable Codes, and Standards 1. Introduction to Gate Valves Gate valves are linear motion valves primarily used to start or stop fluid flow in a pipeline. They are not designed for throttling purposes, as partial opening can cause erosion and vibration. Instead, they are ideal for fully open or fully closed [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[622,623,621],"class_list":["post-18509","post","type-post","status-publish","format-standard","hentry","category-industry-news","tag-flexible-wedge-gate-valve","tag-knife-gate-valve","tag-solid-wedge-gate-valve"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/posts\/18509","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/comments?post=18509"}],"version-history":[{"count":3,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/posts\/18509\/revisions"}],"predecessor-version":[{"id":18512,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/posts\/18509\/revisions\/18512"}],"wp:attachment":[{"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/media?parent=18509"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/categories?post=18509"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/oudianvalve.com\/it\/wp-json\/wp\/v2\/tags?post=18509"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}