{"id":2911,"date":"2022-04-28T11:46:11","date_gmt":"2022-04-28T11:46:11","guid":{"rendered":"http:\/\/sinovalveco.com\/?p=2911"},"modified":"2026-06-03T01:43:19","modified_gmt":"2026-06-03T01:43:19","slug":"ductile-iron-gate-valve","status":"publish","type":"post","link":"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/","title":{"rendered":"Robinet-vanne en fonte ductile"},"content":{"rendered":"<p><strong>Nom de l'auteur :<\/strong> Bruce Zheng<\/p>\n<p><strong>R\u00f4le de l'auteur :<\/strong> Cofondateur et ing\u00e9nieur en vannes chez NTGD Valve<\/p>\n<p><strong>Bio de l'auteur :<\/strong> Bruce Zheng est cofondateur et ing\u00e9nieur en vannes chez NTGD Valve, qui se concentre sur la s\u00e9lection des vannes industrielles, les applications et le contenu technique pour les acheteurs B2B mondiaux.<\/p>\n<p><strong>Derni\u00e8re mise \u00e0 jour :<\/strong> 2 juin 2026<\/p>\n<p>A <strong>ductile iron gate valve<\/strong> is a gate valve with a body and bonnet made from ductile iron, also called nodular cast iron or ductile cast iron. In project specifications, RFQ documents, bills of material, and industry usage, it may also appear as a <strong>DI gate valve<\/strong>, where \u201cDI\u201d means ductile iron.<\/p>\n<p>This type of valve is mainly used for <strong>fully open or fully closed isolation service<\/strong>. It is commonly selected for water supply, wastewater, sewage, irrigation, fire protection, and utility pipelines where buyers need a strong body material, practical coating options, and clear specification data before RFQ.<\/p>\n<p>A ductile iron gate valve should not be selected only by name. Buyers normally need to confirm the valve size, pressure rating, seat design, stem type, end connection, coating, applicable standard, and required drawing or datasheet before procurement. This page helps connect those specification items to common ductile iron gate valve configurations, application limits, and RFQ preparation requirements.<\/p>\n<figure id=\"attachment_10035\" aria-describedby=\"caption-attachment-10035\" style=\"width: 2560px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-10035\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valves-flanged-product-photo-scaled.jpg\" alt=\"Flanged ductile iron gate valves with blue coating in workshop\" width=\"2560\" height=\"1707\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valves-flanged-product-photo-scaled.jpg 2560w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valves-flanged-product-photo-768x512.jpg 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valves-flanged-product-photo-1536x1024.jpg 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valves-flanged-product-photo-2048x1365.jpg 2048w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valves-flanged-product-photo-18x12.jpg 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valves-flanged-product-photo-600x400.jpg 600w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-10035\" class=\"wp-caption-text\">Real flanged ductile iron gate valves help show the product form discussed before the technical selection sections.<\/figcaption><\/figure>\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 des mati\u00e8res<\/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 des mati\u00e8res\"><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\/ductile-iron-gate-valve\/#What_Is_a_Ductile_Iron_Gate_Valve\" >What Is a Ductile Iron Gate Valve?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#What_does_DI_gate_valve_mean\" >What does DI gate valve mean?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Ductile_iron_vs_cast_iron_in_gate_valve_bodies\" >Ductile iron vs cast iron in gate valve bodies<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#How_Does_a_Ductile_Iron_Gate_Valve_Work\" >How Does a Ductile Iron Gate Valve Work?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Open_and_closed_positions\" >Positions ouvertes et ferm\u00e9es<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Why_gate_valves_are_not_used_for_throttling\" >Why gate valves are not used for throttling<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Main_Parts_and_Construction_of_Ductile_Iron_Gate_Valves\" >Main Parts and Construction of Ductile Iron 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-8\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Main_construction_parts\" >Main construction parts<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Body_and_bonnet\" >Body and bonnet<\/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\/ductile-iron-gate-valve\/#Wedge_seat_and_sealing_materials\" >Wedge, seat and sealing materials<\/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\/ductile-iron-gate-valve\/#Stem_handwheel_and_operating_parts\" >Stem, handwheel and operating parts<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Coating_and_corrosion_protection\" >Coating and corrosion protection<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Common_Configurations_of_Ductile_Iron_Gate_Valves\" >Common Configurations of Ductile Iron Gate Valves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Where_Ductile_Iron_Gate_Valves_Are_Used\" >Where Ductile Iron Gate Valves Are Used<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Key_Specifications_to_Confirm_Before_RFQ\" >Key Specifications to Confirm Before RFQ<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#AWWA_C509_C515_and_other_standards\" >AWWA C509 \/ C515 and other standards<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Dimensions_and_drawing_note\" >Dimensions and drawing note<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Benefits_and_Limitations_of_Ductile_Iron_Gate_Valves\" >Benefits and Limitations of Ductile Iron Gate Valves<\/a><\/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\/ductile-iron-gate-valve\/#Troubleshooting_and_Maintenance_Checks\" >Troubleshooting and Maintenance Checks<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#FAQ_About_Ductile_Iron_Gate_Valves\" >FAQ About Ductile Iron 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-21\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#What_does_DI_gate_valve_mean-2\" >What does DI gate valve mean?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Is_a_ductile_iron_gate_valve_the_same_as_a_cast_iron_gate_valve\" >Is a ductile iron gate valve the same as a cast iron gate valve?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Are_all_ductile_iron_gate_valves_resilient_seated\" >Are all ductile iron gate valves resilient seated?<\/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\/ductile-iron-gate-valve\/#When_should_a_resilient_wedge_ductile_iron_gate_valve_be_selected\" >When should a resilient wedge ductile iron gate valve be selected?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#What_should_be_confirmed_for_potable_water_or_water_supply_service\" >What should be confirmed for potable water or water supply service?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Do_ductile_iron_gate_valve_dimensions_vary_by_size_and_end_connection\" >Do ductile iron gate valve dimensions vary by size and end connection?<\/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\/ductile-iron-gate-valve\/#What_information_should_be_provided_before_requesting_a_quotation\" >What information should be provided before requesting a quotation?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Why_are_ductile_iron_gate_valves_not_recommended_for_flow_control\" >Why are ductile iron gate valves not recommended for flow control?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#When_should_a_ductile_iron_gate_valve_be_repaired_or_replaced\" >When should a ductile iron gate valve be repaired or replaced?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Conclusion\" >Conclusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/ntgdvalve.com\/fr\/ductile-iron-gate-valve\/#Light_CTA\" >Light CTA<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_a_Ductile_Iron_Gate_Valve\"><\/span>What Is a Ductile Iron Gate Valve?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A ductile iron <a href=\"https:\/\/ntgdvalve.com\/fr\/gate-valve\/\">vanne \u00e0 opercule<\/a> is a linear-motion valve that opens or closes flow by raising or lowering a gate or wedge inside the valve body. When the gate is lifted, the flow path opens. When the gate is lowered into the seat area, the valve shuts off the flow.<\/p>\n<p>The key difference between a ductile iron gate valve and many other gate valves is the <strong>mat\u00e9riau du corps<\/strong>. Ductile iron has better toughness and impact resistance than ordinary cast iron, which makes it suitable for many utility and waterworks applications. However, the exact performance still depends on the complete valve design, including the seat material, coating, pressure class, end connection, and service conditions.<\/p>\n<p>Ductile iron gate valves are often used where the pipeline requires:<\/p>\n<ul>\n<li>on\/off isolation;<\/li>\n<li>a cost-effective valve body material;<\/li>\n<li>flanged, mechanical joint, or other project-specific connections;<\/li>\n<li>resilient seated or metal seated configurations;<\/li>\n<li>manual or gear-operated operation;<\/li>\n<li>project drawings and datasheets for approval.<\/li>\n<\/ul>\n<p>They are not normally used as throttling valves. For flow regulation, another valve type may be more suitable depending on the medium, pressure, and control requirement.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_does_DI_gate_valve_mean\"><\/span>What does DI gate valve mean?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In industrial and waterworks usage, <strong>DI gate valve<\/strong> usually means <strong>ductile iron gate valve<\/strong>. It is a shortened technical expression used in product titles, project specifications, RFQ documents, bills of material, and distributor listings.<\/p>\n<p>For example, a buyer may describe a requirement as:<\/p>\n<table>\n<thead>\n<tr>\n<th>Specification wording<\/th>\n<th>Signification<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>DI gate valve<\/td>\n<td>Ductile iron gate valve<\/td>\n<\/tr>\n<tr>\n<td>DI NRS gate valve<\/td>\n<td>Ductile iron non-rising stem gate valve<\/td>\n<\/tr>\n<tr>\n<td>DI flanged gate valve<\/td>\n<td>Ductile iron gate valve with flanged ends<\/td>\n<\/tr>\n<tr>\n<td>DI MJ gate valve<\/td>\n<td>Ductile iron gate valve with mechanical joint ends<\/td>\n<\/tr>\n<tr>\n<td>DI resilient wedge gate valve<\/td>\n<td>Ductile iron gate valve with resilient wedge design<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>DI should not be treated as a separate valve type. It is a material abbreviation. The valve still needs to be selected by full service conditions and project specifications.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ductile_iron_vs_cast_iron_in_gate_valve_bodies\"><\/span>Ductile iron vs cast iron in gate valve bodies<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ductile iron and cast iron are related materials, but they are not the same in valve selection. Cast iron is commonly associated with lower-cost valve bodies, while ductile iron is usually selected when better toughness and impact resistance are required.<\/p>\n<table>\n<thead>\n<tr>\n<th>Objet<\/th>\n<th>Robinet-vanne en fonte ductile<\/th>\n<th>Robinet-vanne en fonte<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Main material focus<\/td>\n<td>Ductile iron body and bonnet<\/td>\n<td>Cast iron body and bonnet<\/td>\n<\/tr>\n<tr>\n<td>Typical reason for selection<\/td>\n<td>Selected when the project requires better resistance to handling impact, ground load, pressure fluctuation, or waterworks service stress than ordinary cast iron<\/td>\n<td>Often considered for cost-sensitive general service where the stress level and project specification allow it<\/td>\n<\/tr>\n<tr>\n<td>Common use context<\/td>\n<td>Waterworks, utility, irrigation, sewage, fire protection, industrial water<\/td>\n<td>Low to moderate duty water and general service<\/td>\n<\/tr>\n<tr>\n<td>Attention \u00e0 la s\u00e9lection<\/td>\n<td>Still requires coating, seat, pressure, and standard confirmation<\/td>\n<td>More limited toughness; project suitability must be checked against pressure, installation, and service conditions<\/td>\n<\/tr>\n<tr>\n<td>Current page focus<\/td>\n<td>Oui<\/td>\n<td>No, only as material boundary<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>A ductile iron gate valve page should not be converted into a <a href=\"https:\/\/ntgdvalve.com\/fr\/cast-iron-gate-valve\/\">robinet-vanne en fonte<\/a> page. If the project specifically requires cast iron, the material, rating, corrosion environment, and valve design should be reviewed separately.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_Does_a_Ductile_Iron_Gate_Valve_Work\"><\/span>How Does a Ductile Iron Gate Valve Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A ductile iron gate valve works by moving a gate or wedge vertically across the flow path. The gate is connected to the stem, and the stem is operated by a handwheel, operating nut, gear, or actuator depending on the valve design.<\/p>\n<div style=\"position: relative; width: 100%; max-width: 100%; padding-bottom: 56.25%; height: 0; overflow: hidden; margin: 24px 0;\"><iframe style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0;\" title=\"Vanne \u00e0 clapet NTGD\" src=\"https:\/\/www.youtube.com\/embed\/WOcVj4_bJK4\" allowfullscreen=\"allowfullscreen\"><br \/>\n<\/iframe><\/div>\n<p>When the valve is opened, the gate moves upward and clears the flow passage. When the valve is closed, the gate moves downward and presses into the seat area to stop flow.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Open_and_closed_positions\"><\/span>Positions ouvertes et ferm\u00e9es<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<table>\n<thead>\n<tr>\n<th>Poste<\/th>\n<th>Internal movement<\/th>\n<th>Conditions d'\u00e9coulement<\/th>\n<th>Note de s\u00e9lection<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Enti\u00e8rement ouvert<\/td>\n<td>Gate or wedge is lifted out of the flow path<\/td>\n<td>Flow passes through the valve with low restriction<\/td>\n<td>Suitable for isolation service<\/td>\n<\/tr>\n<tr>\n<td>Enti\u00e8rement ferm\u00e9<\/td>\n<td>Gate or wedge is seated against the sealing area<\/td>\n<td>Flow is stopped<\/td>\n<td>Shutoff depends on seat design and valve condition<\/td>\n<\/tr>\n<tr>\n<td>Partiellement ouvert<\/td>\n<td>Gate remains inside the flow path<\/td>\n<td>Flow is restricted and may become unstable<\/td>\n<td>Not recommended for normal throttling duty<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The working principle is simple, but actual sealing performance depends on the seat type, wedge design, stem condition, coating condition, and whether debris is present in the valve.<\/p>\n<figure id=\"attachment_10037\" aria-describedby=\"caption-attachment-10037\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-10037\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-open-closed-throttling-diagram.png\" alt=\"Ductile iron gate valve fully open fully closed and partially open diagram\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-open-closed-throttling-diagram.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-open-closed-throttling-diagram-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-open-closed-throttling-diagram-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-open-closed-throttling-diagram-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-open-closed-throttling-diagram-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-10037\" class=\"wp-caption-text\">A ductile iron gate valve is intended for isolation service, with fully open or fully closed operation rather than throttling.<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Why_gate_valves_are_not_used_for_throttling\"><\/span>Why gate valves are not used for throttling<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Gate valves are designed mainly for isolation, not continuous flow control. If a ductile iron gate valve is left partially open, the gate and seat may be exposed to vibration, erosion, and uneven flow forces. This can increase wear and reduce sealing performance over time.<\/p>\n<p>For this reason, a ductile iron gate valve is normally specified for:<\/p>\n<ul>\n<li>fully open service;<\/li>\n<li>fully closed service;<\/li>\n<li>infrequent operation;<\/li>\n<li>pipeline isolation;<\/li>\n<li>maintenance shutoff.<\/li>\n<\/ul>\n<p>If the application requires frequent modulation or precise flow control, the valve type should be reviewed before selection.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Main_Parts_and_Construction_of_Ductile_Iron_Gate_Valves\"><\/span>Main Parts and Construction of Ductile Iron Gate Valves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The construction of a ductile iron gate valve affects pressure boundary integrity, sealing performance, operating torque, corrosion protection, installation space, and long-term maintenance.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Main_construction_parts\"><\/span>Main construction parts<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<table>\n<thead>\n<tr>\n<th>Partie<\/th>\n<th>Fonction typique<\/th>\n<th>Why it matters in selection<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Corps<\/td>\n<td>Coquille principale contenant la pression<\/td>\n<td>Must match pressure rating, end connection, coating, and service medium<\/td>\n<\/tr>\n<tr>\n<td>Bonnet<\/td>\n<td>Covers and protects the upper valve assembly<\/td>\n<td>Affects maintenance access and pressure boundary design<\/td>\n<\/tr>\n<tr>\n<td>Porte \/ coin<\/td>\n<td>Moves into or out of the flow path<\/td>\n<td>Determines shutoff behavior and seat contact<\/td>\n<\/tr>\n<tr>\n<td>Si\u00e8ge<\/td>\n<td>Sealing surface against the gate or wedge<\/td>\n<td>Soft seat and metal seat designs suit different services<\/td>\n<\/tr>\n<tr>\n<td>Tige<\/td>\n<td>Transfers handwheel or actuator motion to the gate<\/td>\n<td>Material and design affect corrosion resistance and operating reliability<\/td>\n<\/tr>\n<tr>\n<td>Stem nut \/ wedge nut<\/td>\n<td>Converts rotation into gate movement<\/td>\n<td>Important for smooth opening and closing<\/td>\n<\/tr>\n<tr>\n<td>Handwheel \/ operating nut \/ gear<\/td>\n<td>Manual operating interface<\/td>\n<td>Must match installation location and required operating torque<\/td>\n<\/tr>\n<tr>\n<td>Gasket and packing<\/td>\n<td>Seal bonnet joint and stem area<\/td>\n<td>Important for preventing external leakage<\/td>\n<\/tr>\n<tr>\n<td>Rev\u00eatement<\/td>\n<td>Protects ductile iron surfaces<\/td>\n<td>Especially important in waterworks and buried service<\/td>\n<\/tr>\n<tr>\n<td>Raccordement final<\/td>\n<td>Relie la vanne \u00e0 la canalisation<\/td>\n<td>Flanged, mechanical joint, threaded, or welded ends affect dimensions and installation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure id=\"attachment_10042\" aria-describedby=\"caption-attachment-10042\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-10042\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-parts-cutaway-diagram.png\" alt=\"Ductile iron gate valve cutaway diagram showing body bonnet stem wedge seat coating and end connection\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-parts-cutaway-diagram.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-parts-cutaway-diagram-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-parts-cutaway-diagram-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-parts-cutaway-diagram-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-parts-cutaway-diagram-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-10042\" class=\"wp-caption-text\">The main parts of a ductile iron gate valve affect pressure boundary, sealing, coating protection and installation fit.<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Body_and_bonnet\"><\/span>Body and bonnet<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The body and bonnet are among the main <a href=\"https:\/\/ntgdvalve.com\/fr\/gate-valve-parts\/\">pi\u00e8ces de robinet-vanne<\/a> that define the pressure boundary of the valve. They act as the pressure boundary and protect the internal parts. Their suitability depends on the project pressure class, applicable standard, coating, flange or joint design, and service medium.<\/p>\n<p><a href=\"https:\/\/dl.asminternational.org\/handbooks\/edited-volume\/49\/chapter-abstract\/609758\/Ductile-Iron\" target=\"_blank\" rel=\"noopener\">Fonte ductile<\/a> can provide better toughness than ordinary cast iron, but the body material alone does not define the full valve capability. The full specification should include seat type, pressure rating, coating, connection standard, and test requirement.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Wedge_seat_and_sealing_materials\"><\/span>Wedge, seat and sealing materials<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The gate or wedge is the moving closure element. In many waterworks ductile iron gate valves, the wedge is commonly covered with EPDM, NBR, or another elastomer to form a <a href=\"https:\/\/ntgdvalve.com\/fr\/resilient-seated-gate-valve\/\">resilient seated design<\/a>. In other designs, metal seating surfaces may be used.<\/p>\n<table>\n<thead>\n<tr>\n<th>Sealing direction<\/th>\n<th>Typical feature<\/th>\n<th>Common service context<\/th>\n<th>Attention \u00e0 la s\u00e9lection<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Resilient seated \/ resilient wedge<\/td>\n<td>Elastomer-covered wedge, often EPDM or NBR<\/td>\n<td>Water supply, sewage, wastewater, irrigation, fire protection<\/td>\n<td>Seat material must match temperature, medium, potable water requirements, and project specification<\/td>\n<\/tr>\n<tr>\n<td>Metal seated<\/td>\n<td>Metal-to-metal sealing surfaces<\/td>\n<td>Certain higher-temperature or more severe services<\/td>\n<td>Shutoff behavior and maintenance expectations differ from soft seat valves<\/td>\n<\/tr>\n<tr>\n<td>Soft seal \/ rubber-covered wedge<\/td>\n<td>Similar to resilient seated terminology<\/td>\n<td>Waterworks and utility pipelines<\/td>\n<td>Not suitable for all high-temperature, abrasive, or aggressive media<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure id=\"attachment_10044\" aria-describedby=\"caption-attachment-10044\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-10044\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/resilient-wedge-vs-metal-seated-gate-valve.png\" alt=\"Resilient wedge and metal seated ductile iron gate valve sealing interface comparison\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/resilient-wedge-vs-metal-seated-gate-valve.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/resilient-wedge-vs-metal-seated-gate-valve-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/resilient-wedge-vs-metal-seated-gate-valve-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/resilient-wedge-vs-metal-seated-gate-valve-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/resilient-wedge-vs-metal-seated-gate-valve-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-10044\" class=\"wp-caption-text\">Resilient wedge and metal seated designs use different sealing contact logic and require different material checks.<\/figcaption><\/figure>\n<p>A resilient wedge can improve shutoff behavior in many waterworks services because the elastomer-covered wedge can conform to the seat area better than a rigid metal surface. However, the same material that supports shutoff also creates a selection boundary: EPDM, NBR, and other elastomers must be checked against temperature, medium, water quality requirements, and wastewater conditions before RFQ.<\/p>\n<p>Not every ductile iron gate valve is resilient seated. Resilient seated design is a common configuration, especially in waterworks service, but it should not be treated as the only possible design.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Stem_handwheel_and_operating_parts\"><\/span>Stem, handwheel and operating parts<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The stem connects the operating mechanism to the gate or wedge. In manual ductile iron gate valves, the handwheel or operating nut rotates the stem mechanism to move the gate. In larger sizes or buried service, gear operation or extension stems may be used depending on the installation.<\/p>\n<p>The stem type affects installation and inspection:<\/p>\n<ul>\n<li>a <strong>tige non montante<\/strong> saves vertical space and is common in buried or compact installations;<\/li>\n<li>a <strong>rising stem or OS&amp;Y design<\/strong> gives visible stem movement and can help indicate valve position;<\/li>\n<li>an <strong>operating nut<\/strong> may be used where the valve is operated with a wrench rather than a handwheel.<\/li>\n<\/ul>\n<figure id=\"attachment_10034\" aria-describedby=\"caption-attachment-10034\" style=\"width: 2560px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-10034\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-handwheel-closeup-scaled.jpg\" alt=\"Close-up of ductile iron gate valve handwheel and blue coated valve body\" width=\"2560\" height=\"1707\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-handwheel-closeup-scaled.jpg 2560w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-handwheel-closeup-768x512.jpg 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-handwheel-closeup-1536x1024.jpg 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-handwheel-closeup-2048x1365.jpg 2048w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-handwheel-closeup-18x12.jpg 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-handwheel-closeup-600x400.jpg 600w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-10034\" class=\"wp-caption-text\">The handwheel and stem area affect operation access, torque handling and installation layout.<\/figcaption><\/figure>\n<h3><span class=\"ez-toc-section\" id=\"Coating_and_corrosion_protection\"><\/span>Coating and corrosion protection<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ductile iron should not be described as universally corrosion resistant by itself. In practical projects, corrosion protection usually depends on the correct internal and external coating, the service environment, and the approval requirements for the pipeline system.<\/p>\n<p>For RFQ or project approval, the <a href=\"https:\/\/www.awwa.org\/AWWA-Articles\/awwa-comment-period-on-awwa-c550-protective-interior-coatings-for-valves-and-hydrants\/\" target=\"_blank\" rel=\"noopener\">coating requirement<\/a> should be specified together with:<\/p>\n<ul>\n<li>service medium;<\/li>\n<li>buried or above-ground installation;<\/li>\n<li>internal coating requirement;<\/li>\n<li>external coating requirement;<\/li>\n<li>applicable coating standard;<\/li>\n<li>potable water or wastewater requirement, if applicable.<\/li>\n<\/ul>\n<p>If the coating is under-specified, the valve body material alone may not provide the expected <a href=\"https:\/\/ntgdvalve.com\/fr\/9-anti-corrosion-measures-for-industrial-valve\/\">corrosion protection<\/a> in buried, wastewater, or aggressive utility service.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Common_Configurations_of_Ductile_Iron_Gate_Valves\"><\/span>Common Configurations of Ductile Iron Gate Valves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Older gate valve articles often list many valve types, but for ductile iron gate valve selection, buyers usually need to understand the most common <strong>configuration choices<\/strong> rather than a full gate valve type encyclopedia.<\/p>\n<table>\n<thead>\n<tr>\n<th>Configuration<\/th>\n<th>Ce que cela signifie<\/th>\n<th>Utilisation courante<\/th>\n<th>Note de s\u00e9lection<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Resilient seated \/ resilient wedge<\/td>\n<td>The wedge is covered with elastomer such as EPDM or NBR<\/td>\n<td>Water supply, wastewater, sewage, irrigation, fire protection<\/td>\n<td>Good for many waterworks shutoff duties, but seat material limits must be checked<\/td>\n<\/tr>\n<tr>\n<td>Metal seated<\/td>\n<td>Metal sealing surfaces are used<\/td>\n<td>Certain services where resilient material is not suitable<\/td>\n<td>Shutoff expectation and maintenance may differ<\/td>\n<\/tr>\n<tr>\n<td>Non-rising stem \/ NRS<\/td>\n<td>Stem does not visibly rise above the handwheel or operating nut<\/td>\n<td>Buried service, compact spaces, waterworks lines<\/td>\n<td>Position indication may require other methods<\/td>\n<\/tr>\n<tr>\n<td>Tige montante \/ OS&amp;Y<\/td>\n<td>Stem rises as the valve opens<\/td>\n<td>Above-ground systems, fire protection, inspection-friendly installations<\/td>\n<td>Requires more vertical space<\/td>\n<\/tr>\n<tr>\n<td>Flanged ends<\/td>\n<td>Valve connects to flanged pipe ends<\/td>\n<td>Industrial and waterworks pipelines<\/td>\n<td>Flange standard and drilling must match project requirement<\/td>\n<\/tr>\n<tr>\n<td>Mechanical joint ends \/ MJ<\/td>\n<td>Valve connects using mechanical joint pipe system<\/td>\n<td>Water distribution and underground utility work<\/td>\n<td>Dimensions differ from flanged valves<\/td>\n<\/tr>\n<tr>\n<td>Handwheel operation<\/td>\n<td>Manual operation by handwheel<\/td>\n<td>Accessible above-ground service<\/td>\n<td>Operator access and torque should be considered<\/td>\n<\/tr>\n<tr>\n<td>Operating nut or gear<\/td>\n<td>Used where direct handwheel operation is not practical<\/td>\n<td>Buried, large-size, or high-torque installations<\/td>\n<td>Confirm operation method before RFQ<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure id=\"attachment_10043\" aria-describedby=\"caption-attachment-10043\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-10043\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-common-configurations.png\" alt=\"Common ductile iron gate valve configurations including resilient wedge metal seated NRS OS&amp;Y flanged and mechanical joint\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-common-configurations.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-common-configurations-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-common-configurations-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-common-configurations-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-common-configurations-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-10043\" class=\"wp-caption-text\">Common configuration choices include seat design, stem type and end connection, not only the ductile iron body material.<\/figcaption><\/figure>\n<p>For many waterworks and utility projects, the practical selection question is not only \u201cductile iron or not,\u201d but which combination of seat design, stem type, end connection, operation method, pressure rating, and installation condition matches the project. Resilient seated designs, <a href=\"https:\/\/ntgdvalve.com\/fr\/rising-stem-gate-valve-vs-non-rising-stem-gate-valve\/\">NRS and OS&amp;Y stem designs<\/a>, and flanged or mechanical joint connections are common in many water-related applications, but the final choice still depends on the project standard, pressure class, buried or above-ground installation, and required operation access.<\/p>\n<p>Parallel slide, through conduit, and knife <a href=\"https:\/\/ntgdvalve.com\/fr\/gate-valve-types\/\">gate valve designs<\/a> should not dominate a ductile iron gate valve product-support guide. They may be relevant as separate gate valve topics, but the current page should stay focused on ductile iron gate valves and their common waterworks or utility configurations.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Where_Ductile_Iron_Gate_Valves_Are_Used\"><\/span>Where Ductile Iron Gate Valves Are Used<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Ductile iron gate valves are widely used in utility and industrial pipelines where isolation service is required. The strongest application fit is usually <a href=\"https:\/\/ntgdvalve.com\/fr\/the-role-of-gate-valves-in-water-and-wastewater-management\/\">water and wastewater pipelines<\/a>, but the final choice still depends on pressure, temperature, coating, seat material, medium, and installation conditions.<\/p>\n<table>\n<thead>\n<tr>\n<th>Application<\/th>\n<th>Why ductile iron gate valves are used<\/th>\n<th>Configuration notes<\/th>\n<th>Attention<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Water supply<\/td>\n<td>Strong body material and practical shutoff design for distribution lines<\/td>\n<td>Resilient seated, NRS, flanged or mechanical joint designs are common<\/td>\n<td>Potable water approval requirements, coating, and elastomer material should be confirmed where applicable<\/td>\n<\/tr>\n<tr>\n<td>Sewage and wastewater<\/td>\n<td>Used for isolation in wastewater pipelines and treatment systems<\/td>\n<td>Resilient wedge and coated body designs may be selected<\/td>\n<td>Solids, debris, and chemical exposure may accelerate seat wear or affect shutoff performance<\/td>\n<\/tr>\n<tr>\n<td>Syst\u00e8mes d'irrigation<\/td>\n<td>Suitable for opening or closing water flow in irrigation networks<\/td>\n<td>Flanged or mechanical joint connections may be required<\/td>\n<td>Surge pressure, water hammer, pressure rating, pipe connection, and operation access should be reviewed<\/td>\n<\/tr>\n<tr>\n<td>Protection contre l'incendie<\/td>\n<td>Gate valves may be used where visible status or reliable isolation is required<\/td>\n<td>OS&amp;Y or NRS designs may be specified depending on system design<\/td>\n<td>Approvals, position indication, and project standards must be checked<\/td>\n<\/tr>\n<tr>\n<td>Industrial water lines<\/td>\n<td>Used for plant water, cooling water, or utility water isolation<\/td>\n<td>Material, coating, and seat selection depend on the medium<\/td>\n<td>Not all industrial media are suitable for standard ductile iron designs<\/td>\n<\/tr>\n<tr>\n<td>Construction projects<\/td>\n<td>Used in temporary or permanent utility infrastructure<\/td>\n<td>Size, pressure class, end connection, and drawing approval are important<\/td>\n<td>Dimensions and installation clearances should be confirmed before ordering<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<figure id=\"attachment_10040\" aria-describedby=\"caption-attachment-10040\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-10040\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-application-mapping.png\" alt=\"Ductile iron gate valve application mapping for water supply wastewater irrigation fire protection industrial water and utility projects\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-application-mapping.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-application-mapping-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-application-mapping-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-application-mapping-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-application-mapping-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-10040\" class=\"wp-caption-text\">Ductile iron gate valves are strongest in water-related isolation service, but the seat, coating and medium still need project review.<\/figcaption><\/figure>\n<p>Wrong service assumptions can lead to leakage, premature seat wear, difficult operation, or installation rework. Applications such as crude oil, LNG, high-temperature steam, abrasive slurry, viscous process fluids, chemical service, food service, and pharmaceutical service should not be assumed. These services require a separate valve-type and material review.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Key_Specifications_to_Confirm_Before_RFQ\"><\/span>Key Specifications to Confirm Before RFQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A ductile iron gate valve should not be requested only by valve name. The same nominal valve size can have different dimensions, end connections, stem designs, pressure ratings, and seat materials.<\/p>\n<p>The checklist below helps buyers organize the technical information needed for an accurate quotation and keep the RFQ aligned with the broader <a href=\"https:\/\/ntgdvalve.com\/fr\/instructions-for-selection-of-industrial-valves\/\">s\u00e9lection de vannes industrielles<\/a> process. Confirming these items early can reduce dimensional mismatch, material incompatibility, unnecessary drawing revisions, and project delays.<\/p>\n<figure id=\"attachment_10039\" aria-describedby=\"caption-attachment-10039\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-10039\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-rfq-checklist.png\" alt=\"Ductile iron gate valve RFQ checklist with size pressure standard connection seat coating operation and drawing\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-rfq-checklist.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-rfq-checklist-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-rfq-checklist-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-rfq-checklist-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-rfq-checklist-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-10039\" class=\"wp-caption-text\">A complete RFQ should confirm the valve size, pressure, standard, connection, seat, coating, operation and drawing requirements.<\/figcaption><\/figure>\n<table>\n<thead>\n<tr>\n<th>Point de l'appel d'offres<\/th>\n<th>Pourquoi c'est important<\/th>\n<th>Ce qu'il faut v\u00e9rifier<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Taille de la vanne<\/td>\n<td>Determines pipe fit, flow capacity, and installation dimensions<\/td>\n<td>DN \/ NPS, project pipe size<\/td>\n<\/tr>\n<tr>\n<td>Pression nominale<\/td>\n<td>Defines pressure boundary suitability<\/td>\n<td>PN, Class, working pressure, test requirement<\/td>\n<\/tr>\n<tr>\n<td>Normes de conception<\/td>\n<td>Controls design, testing, and dimensional expectations<\/td>\n<td>Applicable project or industry standard<\/td>\n<\/tr>\n<tr>\n<td>Raccordement final<\/td>\n<td>Affects installation and dimensions<\/td>\n<td>Flanged, mechanical joint, threaded, welded, grooved, or other<\/td>\n<\/tr>\n<tr>\n<td>Norme de bride<\/td>\n<td>Prevents mismatch with pipeline flanges<\/td>\n<td>Face type, drilling, flange class, bolt pattern<\/td>\n<\/tr>\n<tr>\n<td>Face-to-face length<\/td>\n<td>Critical for pipe spool and replacement work<\/td>\n<td>Manufacturer drawing or datasheet<\/td>\n<\/tr>\n<tr>\n<td>Hauteur totale<\/td>\n<td>Important for pits, chambers, and operation clearance<\/td>\n<td>Handwheel, operating nut, stem, gear clearance<\/td>\n<\/tr>\n<tr>\n<td>Mode op\u00e9ratoire<\/td>\n<td>Affects site access and torque<\/td>\n<td>Handwheel, operating nut, gear, actuator-ready design<\/td>\n<\/tr>\n<tr>\n<td>Type de tige<\/td>\n<td>Affects space and position indication<\/td>\n<td>NRS, rising stem, OS&amp;Y<\/td>\n<\/tr>\n<tr>\n<td>Conception du si\u00e8ge<\/td>\n<td>Affects sealing and medium compatibility<\/td>\n<td>Resilient seated, metal seated, EPDM, NBR, bronze or other<\/td>\n<\/tr>\n<tr>\n<td>Mat\u00e9riau du corps et du capot<\/td>\n<td>Confirms pressure boundary material<\/td>\n<td>Ductile iron grade, if required by specification<\/td>\n<\/tr>\n<tr>\n<td>Wedge material<\/td>\n<td>Affects shutoff and service suitability<\/td>\n<td>Ductile iron wedge, EPDM-covered wedge, NBR-covered wedge, metal wedge<\/td>\n<\/tr>\n<tr>\n<td>Rev\u00eatement<\/td>\n<td>Important for waterworks and corrosion protection<\/td>\n<td>Internal coating, external coating, coating standard<\/td>\n<\/tr>\n<tr>\n<td>Moyen<\/td>\n<td>D\u00e9termination de la compatibilit\u00e9 des mat\u00e9riaux et des si\u00e8ges<\/td>\n<td>Water, wastewater, sewage, irrigation water, industrial water, etc.<\/td>\n<\/tr>\n<tr>\n<td>Temp\u00e9rature<\/td>\n<td>Affects seat and coating suitability<\/td>\n<td>Temp\u00e9rature de fonctionnement et de conception<\/td>\n<\/tr>\n<tr>\n<td>Drawing or datasheet<\/td>\n<td>Prevents dimensional mismatch<\/td>\n<td>Confirmed dimensional drawing, weight, bolt details, installation data<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span class=\"ez-toc-section\" id=\"AWWA_C509_C515_and_other_standards\"><\/span>AWWA C509 \/ C515 and other standards<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Waterworks ductile iron gate valves may be specified under standards such as <a href=\"https:\/\/www.awwa.org\/AWWA-Articles\/awwa-comment-period-on-awwa-c509-resilient-seated-gate-valves-for-water-supply-service\/\" target=\"_blank\" rel=\"noopener\">AWWA C509<\/a> or AWWA C515, depending on the project requirement and valve design. These standards should be treated as specification context, not as a universal label for every ductile iron gate valve.<\/p>\n<p>A project may also reference other regional or industry standards. The correct standard must be confirmed before procurement.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Dimensions_and_drawing_note\"><\/span>Dimensions and drawing note<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ductile iron gate valve dimensions are not fixed by the valve name alone. They can vary by:<\/p>\n<ul>\n<li>taille de la valve ;<\/li>\n<li>classe de pression ;<\/li>\n<li>connexion finale ;<\/li>\n<li>norme de la bride ;<\/li>\n<li>face-to-face requirement;<\/li>\n<li>stem type;<\/li>\n<li>operation method;<\/li>\n<li>manufacturer design.<\/li>\n<\/ul>\n<p>A 6 inch flanged ductile iron gate valve and a 6 inch mechanical joint ductile iron gate valve may not have the same overall dimensions. For replacement projects, drawing confirmation is especially important because face-to-face length, flange drilling, bolt pattern, overall height, operating clearance, and weight can affect installation.<\/p>\n<p>When replacing an existing valve, a <a href=\"https:\/\/www.asme.org\/codes-standards\/find-codes-standards\/b16-10-face-face-end-end-dimensions-valves\" target=\"_blank\" rel=\"noopener\">face-to-face length<\/a> mismatch or flange drilling mismatch may require pipe spool changes or field rework. Before RFQ, provide the existing valve drawing, project datasheet, or measured dimensions, and request a confirmed manufacturer drawing when installation space is limited.<\/p>\n<figure id=\"attachment_10036\" aria-describedby=\"caption-attachment-10036\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-10036\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-dimensions-drawing-check.png\" alt=\"Ductile iron gate valve dimension check for flanged and mechanical joint drawings\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-dimensions-drawing-check.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-dimensions-drawing-check-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-dimensions-drawing-check-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-dimensions-drawing-check-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-dimensions-drawing-check-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-10036\" class=\"wp-caption-text\">Flanged and mechanical joint gate valves can have different face-to-face length, height, weight and drawing requirements.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Benefits_and_Limitations_of_Ductile_Iron_Gate_Valves\"><\/span>Benefits and Limitations of Ductile Iron Gate Valves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Ductile iron gate valves are useful when their material, seat design, coating, and connection type match the service. They also have clear limitations that should be checked before selection.<\/p>\n<table>\n<thead>\n<tr>\n<th>Type<\/th>\n<th>Benefit or limitation<\/th>\n<th>Pourquoi c'est important<\/th>\n<th>Note de s\u00e9lection<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>B\u00e9n\u00e9fice<\/td>\n<td>Better toughness than ordinary cast iron<\/td>\n<td>Helps resist impact and mechanical stress better than standard cast iron<\/td>\n<td>Still verify pressure class, installation condition, and project standard<\/td>\n<\/tr>\n<tr>\n<td>B\u00e9n\u00e9fice<\/td>\n<td>Good fit for waterworks isolation<\/td>\n<td>Commonly used in water supply, wastewater, irrigation, and utility service<\/td>\n<td>Confirm coating, seat material, and service approval requirements<\/td>\n<\/tr>\n<tr>\n<td>B\u00e9n\u00e9fice<\/td>\n<td>Low flow restriction when fully open<\/td>\n<td>The gate is lifted out of the flow path<\/td>\n<td>Applies when the valve is fully open, not when used as a control valve<\/td>\n<\/tr>\n<tr>\n<td>B\u00e9n\u00e9fice<\/td>\n<td>Available in resilient seated designs<\/td>\n<td>Elastomer-covered wedge can support tight shutoff in many water services<\/td>\n<td>Seat material must match temperature, medium, and water quality requirements<\/td>\n<\/tr>\n<tr>\n<td>B\u00e9n\u00e9fice<\/td>\n<td>Available in NRS and OS&amp;Y designs<\/td>\n<td>Supports different installation requirements<\/td>\n<td>Choose based on space, operation visibility, and access conditions<\/td>\n<\/tr>\n<tr>\n<td>B\u00e9n\u00e9fice<\/td>\n<td>Multiple end connection options<\/td>\n<td>Supports flanged, mechanical joint, and other project needs<\/td>\n<td>Dimensions change with connection type, so drawings should be checked<\/td>\n<\/tr>\n<tr>\n<td>Limitation<\/td>\n<td>Not suitable for throttling<\/td>\n<td>Partial opening can damage seat and wedge surfaces<\/td>\n<td>Use another valve type for control service<\/td>\n<\/tr>\n<tr>\n<td>Limitation<\/td>\n<td>Soft seats have temperature limits<\/td>\n<td>EPDM, NBR, and other elastomers are not universal<\/td>\n<td>Confirm seat material before high-temperature or aggressive service<\/td>\n<\/tr>\n<tr>\n<td>Limitation<\/td>\n<td>Coating-dependent corrosion protection<\/td>\n<td>Ductile iron usually needs proper coating in waterworks service<\/td>\n<td>Do not assume universal corrosion resistance from body material alone<\/td>\n<\/tr>\n<tr>\n<td>Limitation<\/td>\n<td>Not all services are suitable<\/td>\n<td>Abrasive, corrosive, slurry, high-temperature, or chemical media may require another design<\/td>\n<td>Review service conditions before RFQ<\/td>\n<\/tr>\n<tr>\n<td>Limitation<\/td>\n<td>Dimensions must be verified<\/td>\n<td>Same size does not guarantee same dimensions<\/td>\n<td>Request drawings or datasheets before ordering<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>A ductile iron gate valve can be a strong and practical choice, but it should not be treated as a universal valve for all services. The most important selection notes are usually seat compatibility, coating requirement, end connection, pressure rating, and installation dimensions.<\/p>\n<figure id=\"attachment_10038\" aria-describedby=\"caption-attachment-10038\" style=\"width: 1672px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-10038\" src=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-selection-risk-board.png\" alt=\"Ductile iron gate valve selection risks for throttling seat coating and dimensions\" width=\"1672\" height=\"941\" srcset=\"https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-selection-risk-board.png 1672w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-selection-risk-board-768x432.png 768w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-selection-risk-board-1536x864.png 1536w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-selection-risk-board-18x10.png 18w, https:\/\/ntgdvalve.com\/wp-content\/uploads\/2026\/06\/ductile-iron-gate-valve-selection-risk-board-600x338.png 600w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><figcaption id=\"caption-attachment-10038\" class=\"wp-caption-text\">Wrong service assumptions can cause throttling wear, seat mismatch, coating problems or installation rework.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Troubleshooting_and_Maintenance_Checks\"><\/span>Troubleshooting and Maintenance Checks<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Troubleshooting should start with the actual service conditions, installation status, and valve design. The table below summarizes common problems and checks for ductile iron gate valves. All inspection, disassembly, repair, or replacement work should follow manufacturer instructions, site safety procedures, and the applicable isolation or depressurization requirements.<\/p>\n<table>\n<thead>\n<tr>\n<th>Probl\u00e8me<\/th>\n<th>Cause possible<\/th>\n<th>Ce qu'il faut v\u00e9rifier<\/th>\n<th>Action type<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Couple de fonctionnement \u00e9lev\u00e9<\/td>\n<td>Overtightened gland bolts, stem friction, debris, misalignment<\/td>\n<td>Stem, gland area, packing compression, operation history<\/td>\n<td>Adjust gland bolts according to procedure, clean debris, inspect stem and operating parts<\/td>\n<\/tr>\n<tr>\n<td>La vanne ne s'ouvre pas<\/td>\n<td>Valve was closed with excessive torque, stem or wedge jammed<\/td>\n<td>Handwheel movement, stem condition, bonnet area, obstruction<\/td>\n<td>Inspect according to manufacturer guidance; avoid forcing operation<\/td>\n<\/tr>\n<tr>\n<td>Valve does not open completely<\/td>\n<td>Foreign material inside valve or mechanical obstruction<\/td>\n<td>Wedge travel, internal cavity, stem movement<\/td>\n<td>Clean and inspect internal parts if service procedure allows<\/td>\n<\/tr>\n<tr>\n<td>Valve does not close completely<\/td>\n<td>Debris on seat, damaged wedge, damaged stem, seat wear<\/td>\n<td>Seat area, wedge surface, stem movement<\/td>\n<td>Remove debris after proper isolation; replace damaged seat or wedge if required<\/td>\n<\/tr>\n<tr>\n<td>Leakage through bonnet joint<\/td>\n<td>Loose bolts, gasket wear, damaged sealing surface<\/td>\n<td>Bonnet bolts, gasket condition, mating surfaces<\/td>\n<td>Tighten correctly or replace gasket after depressurization<\/td>\n<\/tr>\n<tr>\n<td>Leakage through seat<\/td>\n<td>Seat damage, debris, worn resilient material, damaged metal surface<\/td>\n<td>Seat and wedge contact area<\/td>\n<td>Clean, inspect, replace seat or wedge if needed<\/td>\n<\/tr>\n<tr>\n<td>Fuite au niveau de la garniture de la tige<\/td>\n<td>Loose gland, worn packing, damaged stuffing box<\/td>\n<td>Packing, gland bolts, stem surface<\/td>\n<td>Adjust gland or replace packing according to procedure<\/td>\n<\/tr>\n<tr>\n<td>Difficult field replacement<\/td>\n<td>Wrong dimensions, connection mismatch, limited access<\/td>\n<td>Face-to-face length, flange drilling, MJ dimensions, operating clearance<\/td>\n<td>Confirm drawing before ordering replacement valve<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For safety, inspection or repair should follow site procedure and manufacturer guidance. A valve installed in buried, pit, or confined-space service may require additional safety and access planning.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ_About_Ductile_Iron_Gate_Valves\"><\/span>FAQ About Ductile Iron Gate Valves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"What_does_DI_gate_valve_mean-2\"><\/span>What does DI gate valve mean?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>DI gate valve usually means ductile iron gate valve. \u201cDI\u201d is a common abbreviation for ductile iron in project specifications, product titles, RFQ documents, and bills of material.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_a_ductile_iron_gate_valve_the_same_as_a_cast_iron_gate_valve\"><\/span>Is a ductile iron gate valve the same as a cast iron gate valve?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. Ductile iron and cast iron are different materials. Ductile iron usually offers better toughness and impact resistance than ordinary cast iron. However, the final valve selection still depends on pressure rating, coating, seat design, end connection, and service conditions.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Are_all_ductile_iron_gate_valves_resilient_seated\"><\/span>Are all ductile iron gate valves resilient seated?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. Many ductile iron gate valves used in waterworks service are resilient seated or resilient wedge designs, but not all ductile iron gate valves are resilient seated. The choice between <a href=\"https:\/\/ntgdvalve.com\/fr\/resilient-seated-gate-valve-vs-metal-seated-gate-valve\/\">resilient seated or metal seated designs<\/a> depends on the medium, temperature, abrasion risk, and service condition.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"When_should_a_resilient_wedge_ductile_iron_gate_valve_be_selected\"><\/span>When should a resilient wedge ductile iron gate valve be selected?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A resilient wedge ductile iron gate valve is often selected for water supply, wastewater, sewage, irrigation, and utility service where shutoff performance and coated ductile iron construction are important. The seat material, such as EPDM or NBR, must still be checked against the medium, temperature, water quality requirement, and project standard.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_should_be_confirmed_for_potable_water_or_water_supply_service\"><\/span>What should be confirmed for potable water or water supply service?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ductile iron gate valves are commonly used in water supply and utility pipelines. For potable water projects, coating, elastomer material, applicable standards, and local approval requirements should be confirmed before procurement.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Do_ductile_iron_gate_valve_dimensions_vary_by_size_and_end_connection\"><\/span>Do ductile iron gate valve dimensions vary by size and end connection?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes. Dimensions depend on valve size, pressure class, end connection, flange standard, face-to-face requirement, stem type, operation method, and manufacturer design. A flanged valve and a mechanical joint valve of the same nominal size may have different dimensions.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_information_should_be_provided_before_requesting_a_quotation\"><\/span>What information should be provided before requesting a quotation?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A useful RFQ should include valve size, pressure rating, medium, temperature, end connection, applicable standard, seat material, coating requirement, operation method, quantity, and whether a drawing or datasheet is required.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Why_are_ductile_iron_gate_valves_not_recommended_for_flow_control\"><\/span>Why are ductile iron gate valves not recommended for flow control?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>They are designed mainly for fully open or fully closed isolation service. Partial opening can expose the gate and seat to vibration, erosion, uneven flow forces, and unstable operation. If the application needs continuous regulation, another valve type should be reviewed.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"When_should_a_ductile_iron_gate_valve_be_repaired_or_replaced\"><\/span>When should a ductile iron gate valve be repaired or replaced?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Repair or replacement may be needed when the valve cannot fully open or close, operating torque becomes abnormal, seat leakage continues after cleaning, stem packing leakage cannot be corrected, or the valve dimensions no longer match the replacement requirement. If repeated repair is required, comparing repair parts, field labor, downtime, and the fit of a new valve with confirmed dimensions can help determine the practical long-term option.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A ductile iron gate valve is best understood as a product-support selection topic, not only as a definition. The valve body material is important, but the final selection also depends on wedge design, seat material, stem type, coating, end connection, standard, dimensions, and service conditions.<\/p>\n<p>For most waterworks and utility applications, buyers should focus on whether the valve needs resilient seated or metal seated construction, NRS or OS&amp;Y operation, flanged or mechanical joint ends, and confirmed drawings or datasheets before procurement. The safest selection process is to match the complete specification to the pipeline service, rather than selecting only by valve name.<\/p>\n<p>Once the specification list is clear, the next step is to review the valve configuration, drawing requirements, and material boundaries before sending the RFQ.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Light_CTA\"><\/span>Light CTA<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For a ductile iron gate valve RFQ, prepare the required size, pressure rating, medium, temperature, end connection, standard, seat material, coating requirement, operation method, and drawing or datasheet request.<\/p>\n<p>NTGD\u2019s valve engineers can provide technical support in selecting a suitable ductile iron gate valve configuration and provide product information, drawings, and datasheets for project review. Final valve approval should still be checked against the project specification, site conditions, and engineering requirements.<\/p>","protected":false},"excerpt":{"rendered":"<p>A product-support guide to ductile iron gate valves, covering DI meaning, working principle, main parts, resilient wedge configurations, waterworks applications, dimensions, and RFQ specification checks.<\/p>","protected":false},"author":2,"featured_media":10035,"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-2911","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\/2911","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=2911"}],"version-history":[{"count":0,"href":"https:\/\/ntgdvalve.com\/fr\/wp-json\/wp\/v2\/posts\/2911\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ntgdvalve.com\/fr\/wp-json\/wp\/v2\/media\/10035"}],"wp:attachment":[{"href":"https:\/\/ntgdvalve.com\/fr\/wp-json\/wp\/v2\/media?parent=2911"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ntgdvalve.com\/fr\/wp-json\/wp\/v2\/categories?post=2911"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ntgdvalve.com\/fr\/wp-json\/wp\/v2\/tags?post=2911"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}