{"id":4534,"date":"2026-10-15T17:00:34","date_gmt":"2026-10-15T09:00:34","guid":{"rendered":"https:\/\/www.pansvalve.com\/?p=4534"},"modified":"2026-10-27T09:16:18","modified_gmt":"2026-10-27T01:16:18","slug":"why-check-valves-chatter","status":"publish","type":"post","link":"https:\/\/www.pansvalve.com\/fr\/blog\/check-valve\/why-check-valves-chatter\/","title":{"rendered":"Why Is Your Check Valve Chattering? Sizing, Minimum Flow and Fixes"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_89 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=\"Basculer la table des mati\u00e8res\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Basculer<\/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-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/check-valve\/why-check-valves-chatter\/#Quick_Answer\" >R\u00e9ponse rapide<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/check-valve\/why-check-valves-chatter\/#Is_It_Really_Check_Valve_Chattering\" >Is It Really Check Valve Chattering?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/check-valve\/why-check-valves-chatter\/#Why_Does_an_Oversized_Check_Valve_Chatter_at_Low_Flow\" >Why Does an Oversized Check Valve Chatter at Low Flow?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/check-valve\/why-check-valves-chatter\/#Can_Installation_Cause_Check_Valve_Chatter\" >Can Installation Cause Check Valve Chatter?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/check-valve\/why-check-valves-chatter\/#How_Do_You_Confirm_the_Cause_Before_Replacing_the_Valve\" >How Do You Confirm the Cause Before Replacing the Valve?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/check-valve\/why-check-valves-chatter\/#Which_Fix_Actually_Stops_Check_Valve_Chattering\" >Which Fix Actually Stops Check Valve Chattering?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/check-valve\/why-check-valves-chatter\/#What_Should_You_Include_in_a_Check_Valve_RFQ\" >What Should You Include in a Check Valve RFQ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/check-valve\/why-check-valves-chatter\/#FAQ\" >FAQ<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.pansvalve.com\/fr\/blog\/check-valve\/why-check-valves-chatter\/#Stop_Guessing_and_Size_for_the_Real_Flow\" >Stop Guessing and Size for the Real Flow<\/a><\/li><\/ul><\/nav><\/div>\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Quick_Answer\"><\/span><strong>R\u00e9ponse rapide<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Check valve chattering is the rapid, repeated opening and closing of the disc, usually caused by unstable flow forces rather than one defective part. The most common causes are an oversized valve running below its minimum stable flow, pulsating flow, poor installation or worn internals. Confirm the noise pattern first, then compare actual flow with the valve\u2019s stable operating range. PANS supplies cast swing, cast lift, wafer and forged check valves and can quote a configuration against the duty data you provide.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This guide shows how to separate chatter from other noise, trace the cause, and choose a fix that matches the duty.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Is_It_Really_Check_Valve_Chattering\"><\/span>Is It Really Check Valve Chattering?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Chatter is rapid, repeated movement of the disc, plate or piston. It lifts, loses the flow force holding it open, drops toward the seat and repeats, producing a fast metallic tick or knock at low flow or pump start-up.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Not every check valve noise is chatter. The fix depends on the mechanism.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Noise pattern<\/th><th>Typical clue<\/th><th>Likely mechanism<\/th><\/tr><\/thead><tbody><tr><td>Rapid metallic ticking or knocking<\/td><td>Follows low flow or pump start\/stop; repeats continuously<\/td><td>Valve disc instability, low flow or worn guide<\/td><\/tr><tr><td>One loud bang at shutdown<\/td><td>Pressure spike; happens once per closure<\/td><td>Water hammer or surge<\/td><\/tr><tr><td>Continuous hiss or crackle<\/td><td>Often downstream of a restriction; damage may follow<\/td><td>Cavitation or flashing<\/td><\/tr><tr><td>Irregular rattle<\/td><td>Can occur at any flow; may change with pressure<\/td><td>Loose trim, debris or worn hinge<\/td><\/tr><tr><td>Rhythmic noise matching pump speed<\/td><td>Repeats with each stroke or revolution<\/td><td>Flow pulsation<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">These are clues, not a diagnosis. A recording, vibration reading and operating log are more useful.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What does check valve chatter sound like?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Most buyers describe a fast metallic flutter or hammering inside the valve. If it stops when flow rises, the valve is probably unstable at its present operating point, not simply broken.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why the difference matters<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Water hammer is a pressure surge. Cavitation is a phase-change problem. Chatter is a flow-and-mechanics problem. Treating all three as \u201ca noisy check valve\u201d can lead to the wrong replacement.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_Does_an_Oversized_Check_Valve_Chatter_at_Low_Flow\"><\/span>Why Does an Oversized Check Valve Chatter at Low Flow?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A valve sized by line diameter alone may be much larger than actual flow requires. At low flow, the disc cannot reach a stable open position. It hovers near the seat, where small flow changes produce large changes in opening force. The result is check valve chatter and wear on the seat, hinge and guide.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is the practical meaning of check valve minimum flow: the lowest flow at which the selected valve remains stable. It is not one universal number. It changes with design, size, spring, orientation, medium and pressure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ask for two values:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Minimum flow to fully open: when the disc or plates reach the intended open position.<\/li>\n\n\n\n<li>Minimum stable flow: the lowest flow at which the valve does not flutter or chatter.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Also request the pressure-drop curve. A smaller valve may stop chatter but create excessive pressure loss, cavitation or insufficient capacity. Sizing is a balance.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1600\" height=\"900\" data-src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/low-flow-disc-chatter-vs-stable-flow-1.webp\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"Two check valves: left labeled Low Flow Disc Chatter with wavy orange arrows; right labeled Stable Flow Stable Open with blue arrows; Minimum Stable Flow between.\" class=\"wp-image-4554 lazyload\"\/><noscript><img decoding=\"async\" width=\"1600\" height=\"900\" src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/low-flow-disc-chatter-vs-stable-flow-1.webp\" alt=\"Two check valves: left labeled Low Flow Disc Chatter with wavy orange arrows; right labeled Stable Flow Stable Open with blue arrows; Minimum Stable Flow between.\" class=\"wp-image-4554\" srcset=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/low-flow-disc-chatter-vs-stable-flow-1.webp 1600w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/low-flow-disc-chatter-vs-stable-flow-1-300x169.webp 300w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/low-flow-disc-chatter-vs-stable-flow-1-1024x576.webp 1024w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/low-flow-disc-chatter-vs-stable-flow-1-768x432.webp 768w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/low-flow-disc-chatter-vs-stable-flow-1-1536x864.webp 1536w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/low-flow-disc-chatter-vs-stable-flow-1-18x10.webp 18w\" sizes=\"(max-width: 1600px) 100vw, 1600px\" \/><\/noscript><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How does valve design affect stability?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">UN <a href=\"https:\/\/www.pansvalve.com\/fr\/products\/cast-swing-check-valve\/\" rel=\"noopener noreferrer\" target=\"_blank\">clapet anti-retour \u00e0 battant en fonte<\/a> uses a hinged disc; disc weight, hinge geometry and orientation set closing force, so low flow and vertical service need attention. A <a href=\"https:\/\/www.pansvalve.com\/fr\/products\/cast-lift-check-valve\/\" rel=\"noopener noreferrer\" target=\"_blank\">clapet anti-retour \u00e0 levage en fonte<\/a> uses a guided disc or piston whose guide and seat affect how steadily it lifts.<\/p>\n\n\n\n<div class=\"product-card\" data-wp-draft-card=\"1\" data-wp-draft-template=\"v-c73141d8aa77cbe3\" style=\"display:flex;flex-wrap:wrap;align-items:center;border:2px solid #cfd5dc;border-radius:10px;overflow:hidden;max-width:900px;margin:20px auto;padding:20px\"><div class=\"product-left\" style=\"flex:1 1 280px;padding-right:20px\"><img decoding=\"async\" data-src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2022\/04\/4.jpg\" alt=\"A silver-colored flanged valve with a bolted top cover, embossed markings PANS, 3, 150, CF8, and HGB02, and a flow arrow on its side.\" class=\"product-image lazyload\" data-wp-card-role=\"image\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" style=\"display:block;width:100%;height:auto;border-radius:8px;object-fit:contain;max-height:350px\" \/><noscript><img decoding=\"async\" alt=\"A silver-colored flanged valve with a bolted top cover, embossed markings PANS, 3, 150, CF8, and HGB02, and a flow arrow on its side.\" class=\"product-image\" data-wp-card-role=\"image\" src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2022\/04\/4.jpg\" style=\"display:block;width:100%;height:auto;border-radius:8px;object-fit:contain;max-height:350px\"><\/noscript><\/div><div class=\"product-right\" style=\"flex:1 1 280px;display:flex;flex-direction:column;justify-content:center\"><p class=\"product-title\" data-wp-card-role=\"title\" style=\"font-size:22px;font-weight:600;color:#333;margin-top:0;margin-bottom:20px;line-height:1.35\">Clapet anti-retour \u00e0 battant en fonte<\/p><a class=\"product-button\" data-wp-card-role=\"button\" href=\"https:\/\/www.pansvalve.com\/fr\/products\/cast-swing-check-valve\/\" rel=\"noopener noreferrer\" style=\"background-color:#d70c19;color:#ffffff;border:none;padding:12px 24px;font-size:16px;border-radius:6px;cursor:pointer;text-decoration:none;display:inline-block;align-self:flex-start;font-weight:600;text-align:center\" target=\"_blank\">View Details<\/a><\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">UN <a href=\"https:\/\/www.pansvalve.com\/fr\/products\/wafer-type-check-valve\/\" rel=\"noopener noreferrer\" target=\"_blank\">wafer-type check valve<\/a> uses two spring-loaded plates, so spring characteristics and pulsation matter. A <a href=\"https:\/\/www.pansvalve.com\/fr\/products\/forged-check-valve\/\" rel=\"noopener noreferrer\" target=\"_blank\">clapet anti-retour forg\u00e9<\/a> may use a lift or swing disc; the two are not interchangeable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Choose the design that stays stable across minimum, normal and maximum flow.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_Installation_Cause_Check_Valve_Chatter\"><\/span>Can Installation Cause Check Valve Chatter?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. A sound valve can chatter when flow reaching it is unstable or misdirected.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Start with orientation and flow direction. The body arrow must match the line, and the installed position must match the approved drawing. Do not assume every vertical position is acceptable. Some designs have limits, and downward flow through a swing check is a common problem. Our <a href=\"https:\/\/www.pansvalve.com\/fr\/blog\/check-valve\/check-valve-flow-direction-guide\/\" rel=\"noopener noreferrer\" target=\"_blank\">check valve flow direction guide<\/a> explains how arrows and drawings align.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Then check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A valve near a pump, elbow, reducer or tee sees swirl and pulsation.<\/li>\n\n\n\n<li>Long unsupported pipe can transmit vibration to the disc.<\/li>\n\n\n\n<li>Air pockets can disturb flow; debris, weld slag or a protruding gasket can restrict disc movement.<\/li>\n\n\n\n<li>Parallel pumps can leave one check valve at low forward flow.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Straight-length needs vary by size and design. Ask for the supplier\u2019s recommendation for the selected model rather than applying one number.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" width=\"1600\" height=\"900\" data-src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/check-valve-installation-inspection-1.webp\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" alt=\"Industrial piping with a blue pump, a silver check valve, and labeled callouts reading Flow Direction, Orientation, Turbulence, and Inspect Internals, plus inset views of a valve and pipe elbow.\" class=\"wp-image-4555 lazyload\"\/><noscript><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"900\" src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/check-valve-installation-inspection-1.webp\" alt=\"Industrial piping with a blue pump, a silver check valve, and labeled callouts reading Flow Direction, Orientation, Turbulence, and Inspect Internals, plus inset views of a valve and pipe elbow.\" class=\"wp-image-4555\" srcset=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/check-valve-installation-inspection-1.webp 1600w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/check-valve-installation-inspection-1-300x169.webp 300w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/check-valve-installation-inspection-1-1024x576.webp 1024w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/check-valve-installation-inspection-1-768x432.webp 768w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/check-valve-installation-inspection-1-1536x864.webp 1536w, https:\/\/www.pansvalve.com\/wp-content\/uploads\/2026\/10\/check-valve-installation-inspection-1-18x10.webp 18w\" sizes=\"(max-width: 1600px) 100vw, 1600px\" \/><\/noscript><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Do_You_Confirm_the_Cause_Before_Replacing_the_Valve\"><\/span>How Do You Confirm the Cause Before Replacing the Valve?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Use a short, evidence-based check.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Log the event. Record pressures, flow, temperature, pump speed and when noise starts or stops. Note start-up, low demand or continuous operation.<\/li>\n\n\n\n<li>Compare flow with the stable range. Ask whether the valve is sized by line or actual flow, and request the minimum stable flow for the quoted model.<\/li>\n\n\n\n<li>Check installation. Confirm the arrow, orientation, alignment, support and nearby fittings.<\/li>\n\n\n\n<li>Inspect internals. After isolation and depressurization, check the disc, hinge pin, guide, spring and seat for wear, debris, erosion or gasket intrusion.<\/li>\n\n\n\n<li>Test a stable point. If safe, raise flow briefly. If noise stops, low-flow instability is likely. If it continues, look for pulsation, worn parts or resonance.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">A pressure trace helps. A rapidly needling gauge or a logged signal with a strong periodic component points to pulsation rather than sizing alone.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Which_Fix_Actually_Stops_Check_Valve_Chattering\"><\/span>Which Fix Actually Stops Check Valve Chattering?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Match the fix to the cause. A different-size valve is not always the answer.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Confirmed cause<\/th><th>Practical correction<\/th><th>What to verify<\/th><\/tr><\/thead><tbody><tr><td>Oversizing or sustained low flow<\/td><td>Re-size to actual flow, or select a design with a lower stable-flow threshold<\/td><td>Pressure drop, capacity and cavitation margin<\/td><\/tr><tr><td>Strong flow pulsation<\/td><td>Reduce pulsation at the pump or compressor; review the valve and piping together<\/td><td>Pressure trace and noise at normal flow<\/td><\/tr><tr><td>Wrong orientation or flow direction<\/td><td>Reinstall to the approved drawing<\/td><td>Body arrow, disc movement and seat contact<\/td><\/tr><tr><td>Debris or worn hinge, guide or seat<\/td><td>Clean or replace the affected parts<\/td><td>Free movement and seat condition<\/td><\/tr><tr><td>Water hammer mistaken for chatter<\/td><td>Address closure speed and surge<\/td><td>Peak pressure at closure<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A smaller valve may need reducers; check the revised pressure drop and ensure the reducer does not create a new disturbance. If pulsation is the cause, a new valve may only move the noise.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a replacement, compare designs at the same duty. Our <a href=\"https:\/\/www.pansvalve.com\/fr\/blog\/check-valve\/swing-check-valve-vs-spring-check-valve\/\" rel=\"noopener noreferrer\" target=\"_blank\">swing check valve vs spring check valve<\/a> comparison explains how gravity and spring force change closing behaviour. Spring assistance can improve closure, but it changes cracking pressure and pressure drop. Confirm both for the exact model.<\/p>\n\n\n\n<div class=\"cldg-card-container\" data-wp-draft-card=\"2\" data-wp-draft-template=\"v-fee0b72765030d57\" style=\"display:flex;flex-wrap:wrap-reverse;width:100%;margin:20px 0;border:1px solid #e0e0e0;border-radius:8px;overflow:hidden;background-color:#ffffff;font-family:&quot;Poppins&quot;, Arial, sans-serif\"><div class=\"cldg-card-text-column\" style=\"flex:55 1 300px;padding:30px;display:flex;flex-direction:column;justify-content:center\"><p class=\"cldg-card-title\" data-wp-card-role=\"title\" style=\"font-size:24px;font-weight:600;color:#111111;margin-top:0;margin-bottom:15px;line-height:1.3;text-transform:capitalize\">Clapet anti-retour de type plaquette<\/p><p class=\"cldg-card-description\" data-wp-card-role=\"description\" style=\"font-size:16px;color:#444444;line-height:1.6;margin-bottom:20px\">Dual springs for quick closure \u00b7 API594 design\/manufacture \u00b7 API598 inspection\/test<\/p><a class=\"cldg-card-cta-button\" data-wp-card-role=\"button\" href=\"https:\/\/www.pansvalve.com\/fr\/products\/wafer-type-check-valve\/\" rel=\"noopener noreferrer\" style=\"display:inline-block;width:fit-content;padding:10px 26px;font-size:16px;font-weight:600;color:#d70c19;background-color:#ffffff;border:2px solid #d70c19;border-radius:5px;text-decoration:none;text-align:center;line-height:1.4\" target=\"_blank\">Voir les sp\u00e9cifications<\/a><\/div><div class=\"cldg-card-image-column\" style=\"flex:45 1 260px;min-height:250px\"><a href=\"https:\/\/www.pansvalve.com\/fr\/products\/wafer-type-check-valve\/\" rel=\"noopener noreferrer\" style=\"display:block;width:100%;height:100%\" target=\"_blank\"><img decoding=\"async\" class=\"lazyload\" data-src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2022\/04\/6.jpg\" alt=\"Silver metal wafer check valve with lifting eye, bolts, and embossed text DN100, 16, WCB, CH78, and a flow arrow.\" data-wp-card-role=\"image\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" style=\"width:100%;height:100%;object-fit:cover;display:block\" \/><noscript><img decoding=\"async\" alt=\"Silver metal wafer check valve with lifting eye, bolts, and embossed text DN100, 16, WCB, CH78, and a flow arrow.\" data-wp-card-role=\"image\" src=\"https:\/\/www.pansvalve.com\/wp-content\/uploads\/2022\/04\/6.jpg\" style=\"width:100%;height:100%;object-fit:cover;display:block\"><\/noscript><\/a><\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Review <a href=\"https:\/\/www.pansvalve.com\/fr\/blog\/check-valve\/the-10-misunderstood-for-check-valve\/\" rel=\"noopener noreferrer\" target=\"_blank\">common check valve misconceptions<\/a> before approving a like-for-like replacement. Matching the old size may repeat the old sizing error.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Should_You_Include_in_a_Check_Valve_RFQ\"><\/span>What Should You Include in a Check Valve RFQ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A clear enquiry lets the supplier check stability, not guess from size.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Process data: fluid, composition and solids; minimum, normal and maximum flow with units; design and operating pressure plus differential; temperature; pump or compressor type and whether flow is steady or pulsating.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Installation data: line size and schedule; flow direction and orientation; end connection and face-to-face; available space and nearby fittings; for replacement, the existing model, drawing and dimensions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Performance and documents: allowable pressure drop; minimum flow to fully open and minimum stable flow; closing or surge requirement; required standard, test report, material certificate and drawing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ask one direct question: \u201cIs this model selected by line size or actual flow, and what is its minimum stable flow?\u201d The answer shows whether the quote is based on your duty.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. <strong>What causes check valve chattering?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Unstable disc movement at low flow, often from oversizing. Pulsation, wrong orientation, debris and worn hinge or guide parts can cause the same symptom.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. <strong>Can a check valve be too large?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. A valve selected for line size may be too large for actual flow. The disc runs partly open and may flutter. Check pressure drop before downsizing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. <strong>What is check valve minimum flow?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The lowest flow at which the selected valve remains stable. Ask for both fully-open flow and minimum stable flow; they are not always the same.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. <strong>Will a spring-loaded design stop chatter?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Not automatically. Spring force can improve closure and stability, but raises cracking pressure and may increase pressure drop. Confirm the spring against the actual flow range.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Stop_Guessing_and_Size_for_the_Real_Flow\"><\/span>Stop Guessing and Size for the Real Flow<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Check valve chattering is a symptom, not a diagnosis. Separate it from water hammer, cavitation and mechanical rattle, then compare the valve\u2019s stable range with the real operating range. Sizing, installation and maintenance solve different parts of the problem.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PANS supplies cast swing, cast lift, wafer and forged check valves. Share your fluid, minimum and maximum flow, pressure, temperature, line size, orientation and existing valve details to request a quotation for the required configuration.<\/p>\n\n\n\n<div class=\"wp-block-button\" data-wp-draft-contact=\"1\" data-wp-draft-fixed-text=\"Get a Quote\" style=\"display:block;width:100%;text-align:center;margin:32px 0\"><a class=\"wp-block-button__link has-white-color has-red-background-color has-text-color has-background has-link-color wp-element-button\" data-wp-card-role=\"contact-button\" href=\"https:\/\/www.pansvalve.com\/fr\/contact-us\/\" rel=\"noopener noreferrer\" style=\"display:inline-block;padding:15px 30px;border-radius:0;background-color:#cf2e2e;color:#ffffff;font-family:Poppins,Arial,sans-serif;font-size:16px;font-weight:500;line-height:1.5;text-decoration:none;text-align:center\" target=\"_blank\">Obtenez un devis<\/a><\/div>","protected":false},"excerpt":{"rendered":"<p>Quick Answer Check valve chattering is the rapid, repeated opening and closing of the disc, usually caused by unstable flow forces rather than one defective part. The most common causes are an oversized valve running below its minimum stable flow, pulsating flow, poor installation or worn internals. Confirm the noise pattern first, then compare actual [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":4553,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[189],"tags":[43],"class_list":["post-4534","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-check-valve","tag-valves"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Check Valve Chattering: Causes, Minimum Flow &amp; Fixes<\/title>\n<meta name=\"description\" content=\"Check valve chattering often means low-flow instability, oversizing or installation problems. 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