{"id":18680,"date":"2026-05-27T06:20:45","date_gmt":"2026-05-27T06:20:45","guid":{"rendered":"https:\/\/oudianvalve.com\/?post_type=product&p=18680"},"modified":"2026-05-27T06:28:53","modified_gmt":"2026-05-27T06:28:53","slug":"axial-flow-check-valves-310s-dn40-pn16-flange-end","status":"publish","type":"product","link":"https:\/\/oudianvalve.com\/fr\/products\/check-valves\/axial-flow-check-valves-310s-dn40-pn16-flange-end\/","title":{"rendered":"Axial Flow Check Valves,310S,DN40,PN16,Flange End"},"content":{"rendered":"
An <\/span>Clapet anti-retour \u00e0 d\u00e9bit axial<\/strong> (also known as a nozzle check valve or silent check valve) is an advanced, non-return valve designed to prevent backflow in critical pipeline systems<\/mark>. Unlike standard swing check valves, the disc moves along the central axis of the pipe, guided by a spring-assisted mechanism.<\/div>\n
This design makes it the ultimate solution for preventing water hammer<\/strong> and pressure surges in high-pressure or high-velocity systems.<\/div>\n
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\u00a0Comment \u00e7a marche<\/div>\n
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  • Flow Opens:<\/strong> Fluid enters, compressing an internal spring and pushing the streamlined disc smoothly off its seat.<\/span><\/li>\n
  • Flow Slows:<\/strong> As fluid velocity drops, the spring proactively forces the disc back toward the seat before<\/em> the flow actually reverses.<\/span><\/li>\n
  • Silent Closure:<\/strong> The disc closes across a very short stroke distance, seating quietly right at the moment of zero fluid velocity.<\/span><\/li>\n

    <\/ul>\n

    <\/div>\n
    \u00a0Key Advantages Over Swing Check Valves<\/div>\n
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    • No Water Hammer:<\/strong> Proactive spring closure prevents the reverse fluid slam that causes devastating pressure shocks.<\/span><\/li>\n
    • Ultra-Short Stroke:<\/strong> The disc only moves a fraction of the distance of a swing valve, leading to incredibly fast closure times (often under 0.1 seconds).<\/span><\/li>\n
    • Low Pressure Drop:<\/strong> The internal geometry is dynamically shaped like a venturi nozzle, minimizing turbulence and energy loss during operation.<\/span><\/li>\n
    • Flexible Installation:<\/strong> Can be safely installed in both horizontal and vertical pipelines<\/strong> (flowing either up or down) because it relies on spring tension rather than gravity.<\/span><\/li>\n

      <\/ul>\n

      <\/div>\n
      \u00a0Technical Specifications & Materials<\/div>\n
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      • Design Standards:<\/strong> Commonly built to API 6D<\/strong>, ASME B16.34<\/strong>, or DIN\/EN<\/strong> standards.<\/span><\/li>\n
      • Size Range:<\/strong> DN50 to DN1500+ (2″ to 60″+).<\/span><\/li>\n
      • Pressure Ratings:<\/strong> ASME Class 150 to Class 2500; PN10 to PN420.<\/span><\/li>\n
      • Available Materials:<\/strong> Standard Carbon Steel (WCB), Stainless Steel (CF8M), Super Duplex, and premium alloys like TA2 Titanium<\/strong> for aggressive chemical or marine environments.<\/span><\/li>\n

        <\/ul>\n

        <\/div>\n
        \u00a0Primary Applications<\/div>\n
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        • Pump Discharge Lines:<\/strong> Installed immediately after large water, oil, or gas pumps to protect them from reverse flow shocks when shut down.<\/span><\/li>\n
        • Compressor Stations:<\/strong> Used in natural gas pipelines where rapid flow fluctuations require split-second valve responses.<\/span><\/li>\n
        • Desalination & Water Transmission:<\/strong> Crucial in high-volume water networks to protect infrastructure from catastrophic water hammer cracks.<\/span><\/li>\n<\/ul>\n
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          \n

          FAQ: Axial Flow Check Valves<\/strong><\/h1>\n<\/div>\n<\/div>\n<\/div>\n
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          Here is a list of Frequently Asked Questions (FAQ) regarding <\/span>Axial Flow Check Valves<\/strong> to help you understand their operation, selection, and performance advantages.<\/div>\n
          <\/div>\n
          1. Why is an axial flow check valve called a “silent” check valve?<\/div>\n
          It is called silent because it closes before<\/strong> the fluid in the pipeline can reverse direction. In standard swing check valves, the fluid reverses first and violently slams the disc shut, creating a loud bang and a destructive pressure wave (water hammer). The axial flow valve uses a spring to close the disc quietly right at the moment fluid velocity drops to zero.<\/div>\n
          <\/div>\n
          2. Can an axial flow check valve be installed vertically?<\/div>\n
          Yes. Unlike swing check valves\u2014which rely on gravity and must be installed horizontally or in upward-flowing vertical lines\u2014axial flow check valves rely on internal spring tension<\/strong>. This allows them to be installed in any orientation, including vertical lines with downward flow, without losing performance.<\/div>\n
          <\/div>\n
          3. What is the difference between a “short stroke” and a “long stroke” design?<\/div>\n
          Axial flow check valves inherently feature a short stroke<\/strong>, meaning the disc only travels a very short distance to fully open or close (typically only 1\/4 of the pipe diameter). This short travel distance is the main reason the valve can close so rapidly\u2014often in less than 0.1 seconds.<\/div>\n
          <\/div>\n
          4. Does the internal spring create a large pressure drop?<\/div>\n
          No, the pressure drop is actually very low. The internal body of the valve is cast in a streamlined, venturi nozzle shape. This aerodynamic geometry guides the fluid smoothly around the disc, minimizing turbulence, restriction, and energy loss despite the presence of the spring.<\/div>\n
          <\/div>\n
          5. What are the most common applications for these valves?<\/div>\n
          They are preferred in high-risk, high-velocity, and critical infrastructure systems, such as:<\/div>\n
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          • Multi-pump manifolds<\/strong> (preventing backflow into idle pumps).<\/span><\/li>\n
          • Gas compressor stations<\/strong> (handling rapid flow cycling).<\/span><\/li>\n
          • Crude oil and LNG pipelines<\/strong> (protecting high-value surge equipment).<\/span><\/li>\n
          • High-lift water distribution<\/strong> and desalination networks.<\/span><\/li>\n

            <\/ul>\n

            <\/div>\n
            6. Do axial flow check valves require regular maintenance?<\/div>\n
            They require significantly less maintenance<\/strong> than swing check valves. Because the disc moves smoothly along a central shaft guided by bushings, there are no heavy external hinges or pins to wear down. However, over several years of high-cycle operation, the internal spring and guide bushings should be inspected for wear.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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            <\/div>","protected":false},"excerpt":{"rendered":"

            China Axial Flow Check Valves,310S Axial Flow Check Valves,DN40 Axial Flow Check Valves,PN16 Axial Flow Check Valves,Flange End Axial Flow Check Valves, Axial Flow Check Valves Factory.<\/p>","protected":false},"featured_media":18681,"template":"","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false},"product_brand":[],"product_cat":[82],"product_tag":[763,767,762,764,766,765],"class_list":{"0":"post-18680","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-check-valves","7":"product_tag-310s-axial-flow-check-valves","8":"product_tag-axial-flow-check-valves-factory","9":"product_tag-china-axial-flow-check-valves","10":"product_tag-dn40-axial-flow-check-valves","11":"product_tag-flange-end-axial-flow-check-valves","12":"product_tag-pn16-axial-flow-check-valves","14":"first","15":"instock","16":"shipping-taxable","17":"product-type-simple"},"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/product\/18680","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/media\/18681"}],"wp:attachment":[{"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/media?parent=18680"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/product_brand?post=18680"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/product_cat?post=18680"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/oudianvalve.com\/fr\/wp-json\/wp\/v2\/product_tag?post=18680"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}