{"id":447,"date":"2026-09-21T04:45:51","date_gmt":"2026-09-21T04:45:51","guid":{"rendered":"https:\/\/www.industrialpumpandvalve.com\/blog\/?p=447"},"modified":"2026-09-21T05:25:55","modified_gmt":"2026-09-21T05:25:55","slug":"pressure-relief-valve-vs-non-return-valve","status":"publish","type":"post","link":"https:\/\/www.industrialpumpandvalve.com\/blog\/pressure-relief-valve-vs-non-return-valve\/","title":{"rendered":"What Is the Difference Between a Pressure Relief Valve and an Inline Check \/ Non Return Valve?"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>Table of Content<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"#what-is-a-pressure-relief-valve\">What Is a Pressure Relief Valve?<\/a><\/li>\n\n\n\n<li><a href=\"#how-does-a-pressure-relief-valve-work\">How Does a Pressure Relief Valve Work?<\/a><\/li>\n\n\n\n<li><a href=\"#what-is-a-non-return-valve\">What Is a Non Return Valve?<\/a><\/li>\n\n\n\n<li><a href=\"#how-does-a-non-return-valve-work\">How Does a Non Return Valve Work?<\/a><\/li>\n\n\n\n<li><a href=\"#pressure-relief-valve-vs-non-return-valve-key-differences\">Pressure Relief Valve vs Non Return Valve: Key Differences<\/a><\/li>\n\n\n\n<li><a href=\"#types-of-pressure-relief-valves\">Types of Pressure Relief Valves<\/a><\/li>\n\n\n\n<li><a href=\"#types-of-non-return-valves\">Types of Non Return Valves<\/a><\/li>\n\n\n\n<li><a href=\"#where-are-these-valves-used\">Where Are These Valves Used?<\/a><\/li>\n\n\n\n<li><a href=\"#does-a-pumping-system-need-both\">Does a Pumping System Need Both?<\/a><\/li>\n\n\n\n<li><a href=\"#how-to-choose-the-right-valve-for-your-application\">How to Choose the Right Valve for Your Application<\/a><\/li>\n\n\n\n<li><a href=\"#faqs\">FAQs<\/a><\/li>\n\n\n\n<li><a href=\"#final-thoughts\">Final Thoughts<\/a><\/li>\n<\/ul>\n\n\n\n<p>If you work around pumps, boilers, or pressurised pipelines, you have probably heard both terms used in the same breath, sometimes even used for the same part by mistake. A pressure relief valve and a non return valve are both automatic valves that need no manual operation, and both are considered safety-related fittings. That is where the similarity ends.<\/p>\n\n\n\n<p>A pressure relief valve protects your system from too much pressure. A non return valve stops fluid from flowing backward. One deals with force, the other deals with direction. Mixing them up during system design, or leaving one out because you think the other one covers it, is a common and costly mistake. This guide breaks down what each valve does, how it works, where it is used, and how to pick the right one for your application.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-is-a-pressure-relief-valve\"><strong>What Is a Pressure Relief Valve?<\/strong><\/h2>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"512\" src=\"https:\/\/www.industrialpumpandvalve.com\/blog\/wp-content\/uploads\/2026\/09\/Pressure-Relief-Valve-1.jpg\" alt=\"Pressure Relief Valve\" class=\"wp-image-451\" srcset=\"https:\/\/www.industrialpumpandvalve.com\/blog\/wp-content\/uploads\/2026\/09\/Pressure-Relief-Valve-1.jpg 1024w, https:\/\/www.industrialpumpandvalve.com\/blog\/wp-content\/uploads\/2026\/09\/Pressure-Relief-Valve-1-300x150.jpg 300w, https:\/\/www.industrialpumpandvalve.com\/blog\/wp-content\/uploads\/2026\/09\/Pressure-Relief-Valve-1-768x384.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>A pressure relief valve (PRV) is a valve designed to protect a pressurised system from excessive pressure. When system pressure reaches the set limit, the valve opens to release pressure and protect connected equipment. Once pressure returns to the normal range, the valve reseats.<\/p>\n\n\n\n<p>Its primary function is overpressure protection. Depending on the valve design, it may also provide controlled flow adjustment or other functions within the system. It does not care which direction fluid is normally flowing, and it is not meant to be open during day-to-day operation. We have covered this valve in more depth in our earlier post on <a href=\"https:\/\/www.industrialpumpandvalve.com\/blog\/what-is-a-pressure-relief-valve\/\">what a pressure relief valve is<\/a>, including its internal parts and datasheet terms, so this article will stay focused on how it compares to a non return valve.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-does-a-pressure-relief-valve-work\"><strong>How Does a Pressure Relief Valve Work? <\/strong><\/h2>\n\n\n\n<p>A PRV goes through four stages during its working life:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Closed<\/strong>: The valve disc sits sealed against its seat under normal system pressure.<\/li>\n\n\n\n<li><strong>Cracking<\/strong>: Once pressure reaches the set point, the disc starts to lift, and fluid begins to escape.<\/li>\n\n\n\n<li><strong>Full lift<\/strong>: Pressure keeps building slightly, and the valve opens fully to discharge fluid quickly.<\/li>\n\n\n\n<li><strong>Reseating<\/strong>: Once pressure drops to a safe level, the disc returns to its seat and the valve closes.<\/li>\n<\/ol>\n\n\n\n<p>This cycle can repeat many times over a valve&#8217;s life, and it is designed to happen without any manual input.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-is-a-non-return-valve\"><strong>What Is a Non Return Valve? <\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"512\" src=\"https:\/\/www.industrialpumpandvalve.com\/blog\/wp-content\/uploads\/2026\/09\/Return-Valve.jpg\" alt=\" Inline Check \/ Non Return Valve\" class=\"wp-image-452\" srcset=\"https:\/\/www.industrialpumpandvalve.com\/blog\/wp-content\/uploads\/2026\/09\/Return-Valve.jpg 1024w, https:\/\/www.industrialpumpandvalve.com\/blog\/wp-content\/uploads\/2026\/09\/Return-Valve-300x150.jpg 300w, https:\/\/www.industrialpumpandvalve.com\/blog\/wp-content\/uploads\/2026\/09\/Return-Valve-768x384.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>A non-return valve (NRV), also known as an inline check valve, allows fluid to flow in one direction while automatically preventing reverse flow. As soon as flow tries to reverse, even for a moment, the valve shuts on its own and blocks it.<\/p>\n\n\n\n<p>There is no external control, spring setting, or pressure threshold involved in the way a PRV works. The valve simply opens when flow pushes forward and closes when that push disappears or reverses. Its purpose is to protect pumps, pipelines, and equipment from backflow, not from high pressure.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-does-a-non-return-valve-work\"><strong>How Does a Non Return Valve Work?<\/strong><\/h2>\n\n\n\n<p>An inline check valve automatically allows forward flow and prevents reverse flow. Its compact, straight-through design makes it suitable for high-pressure pipelines, pump discharge lines, instrumentation, tubing, and pressure-testing systems, and fluid passes through with almost no resistance. The moment flow slows down or tries to reverse, the same disc, ball, or flap swings or drops back onto its seat and seals the line.<\/p>\n\n\n\n<p>There is no set pressure to configure. The valve only responds to the direction fluid wants to move in.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"pressure-relief-valve-vs-non-return-valve-key-differences\"><strong>Pressure Relief Valve vs Non Return Valve: Key Differences <\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Point<\/strong><\/td><td><strong>Pressure Relief Valve<\/strong><\/td><td><strong>Non Return Valve<\/strong><\/td><\/tr><tr><td>Main job<\/td><td>Protects the system from excess pressure<\/td><td>Stops backflow<\/td><\/tr><tr><td>What triggers it<\/td><td>Pressure crossing a set point<\/td><td>Flow trying to reverse direction<\/td><\/tr><tr><td>Normal position<\/td><td>Overpressure protection<\/td><td>Backflow prevention<\/td><\/tr><tr><td>What it controls<\/td><td>Pressure<\/td><td>Direction of flow<\/td><\/tr><tr><td>Needs a pressure setting<\/td><td>Yes<\/td><td>No<\/td><\/tr><tr><td>Risk if missing<\/td><td>Equipment rupture, pipeline failure, injury<\/td><td>Water hammer, pump damage, contamination of the supply line<\/td><\/tr><tr><td>Common name variations<\/td><td>Safety valve, relief valve, PRV<\/td><td>Check valve, one-way valve, NRV<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"types-of-pressure-relief-valves\"><strong>Types of Pressure Relief Valves <\/strong><\/h2>\n\n\n\n<p>Pressure relief valves are available in different designs depending on pressure, fluid, application, and required control. Industrial Pump and Valve&#8217;s pressure relief valve range is designed for high-pressure applications and is available in SS 316, SS 316L, SS 304, and carbon steel, with pressure ratings up to 14,500 PSI (1000 bar).<\/p>\n\n\n\n<p>If you are sourcing valves for a new project, working with an established <a href=\"https:\/\/www.industrialpumpandvalve.com\/industrial-valve-manufacturer-in-ahmedabad.html\" target=\"_blank\" rel=\"noreferrer noopener\">pressure relief valve manufacturer<\/a> that can supply certified, tested valves in the right pressure class will save you rework later.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"types-of-non-return-valves\"><strong>Types of Non Return Valves <\/strong><\/h2>\n\n\n\n<p>NRVs also come in several designs depending on pipe size, pressure, and how much space you have:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Swing check valve<\/strong>: a hinged disc swings open with forward flow and swings shut on reversal, common in larger pipelines.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Lift check valve<\/strong>: a disc lifts straight up off its seat, similar in principle to a globe valve.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ball check valve<\/strong>: a free-floating ball seals the seat, often used with thicker or slurry-type fluids.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Dual plate or wafer check valve<\/strong>: compact, lightweight, and easy to fit between flanges in tight spaces.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Diaphragm check valve<\/strong>: uses a flexible diaphragm instead of a rigid disc, good for lower pressure and corrosive fluids.<\/li>\n<\/ul>\n\n\n\n<p>When you are ready to buy, choosing a reliable <a href=\"https:\/\/www.industrialpumpandvalve.com\/non-return-valve-manufacturer.html\" target=\"_blank\" rel=\"noreferrer noopener\">non return valve manufacturer<\/a> that tests every valve before dispatch makes a real difference to how long it lasts in the field.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"where-are-these-valves-used\"><strong>Where Are These Valves Used? <\/strong><\/h2>\n\n\n\n<p><strong>Pressure relief valves are common on:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Boilers and steam systems<\/li>\n\n\n\n<li>Compressed air receivers and gas cylinders<\/li>\n\n\n\n<li>Chemical reactors and process vessels<\/li>\n\n\n\n<li>Oil and gas pipelines and wellheads<\/li>\n\n\n\n<li>Pump casings, to guard against deadheading<\/li>\n<\/ul>\n\n\n\n<p><strong>Non return valves are common on: <\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pump discharge lines, to stop backflow when the pump stops<\/li>\n\n\n\n<li>Water treatment and sewage pumping stations<\/li>\n\n\n\n<li>Firefighting and sprinkler systems<\/li>\n\n\n\n<li>HVAC piping loops<\/li>\n\n\n\n<li>Systems with two or more pumps running in parallel, so one pump cannot push flow back through an idle one<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"does-a-pumping-system-need-both\"><strong>Does a Pumping System Need Both? <\/strong><\/h2>\n\n\n\n<p>A pumping system may require a non-return valve, a pressure relief valve, or both, depending on the system design and operating requirements. A non-return valve helps prevent reverse flow, while a pressure relief valve provides overpressure protection. Where both risks exist, both types of valves may be specified. A non return valve is usually fitted right after the pump outlet to stop water or fluid from running backward through the pump when it switches off, which protects the pump from reverse spin and water hammer. A pressure relief valve is fitted separately on the pump casing or downstream line to release pressure if the system gets blocked or a valve downstream is shut by mistake.<\/p>\n\n\n\n<p>Neither valve can do the other&#8217;s job. A plant that only fits an NRV is still exposed to overpressure damage, and a plant that only fits a PRV can still suffer backflow and pump damage. This is why most specification sheets from an experienced <a href=\"https:\/\/www.industrialpumpandvalve.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">industrial pump manufacturer in India<\/a> will call out both valves as separate line items, not one substituting for the other.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-to-choose-the-right-valve-for-your-application\"><strong>How to Choose the Right Valve for Your Application <\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"512\" src=\"https:\/\/www.industrialpumpandvalve.com\/blog\/wp-content\/uploads\/2026\/09\/how-to-choose-the-right-valve-for-your-application.jpg\" alt=\"How to Choose the Right Valve for Your Application\" class=\"wp-image-450\" srcset=\"https:\/\/www.industrialpumpandvalve.com\/blog\/wp-content\/uploads\/2026\/09\/how-to-choose-the-right-valve-for-your-application.jpg 1024w, https:\/\/www.industrialpumpandvalve.com\/blog\/wp-content\/uploads\/2026\/09\/how-to-choose-the-right-valve-for-your-application-300x150.jpg 300w, https:\/\/www.industrialpumpandvalve.com\/blog\/wp-content\/uploads\/2026\/09\/how-to-choose-the-right-valve-for-your-application-768x384.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong>Before ordering either valve, check the following:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Fluid type<\/strong>: water, steam, gas, chemicals, or slurry, since each affects material choice and seal type.<\/li>\n\n\n\n<li><strong>Pressure and temperature rating<\/strong>: the valve must be rated above your system&#8217;s maximum operating conditions, not just the average.<\/li>\n\n\n\n<li><strong>Material of construction<\/strong>: stainless steel, brass, cast iron, or forged steel, depending on corrosion resistance needed.<\/li>\n\n\n\n<li><strong>Standards and certification<\/strong>: look for compliance with recognised codes such as ASME or API where the application demands it.<\/li>\n\n\n\n<li><strong>Ease of maintenance<\/strong>: valves that are hard to access get skipped during shutdowns, so plan for inspection access from day one.<\/li>\n\n\n\n<li><strong>Supplier track record<\/strong>: buying from a proven <a href=\"https:\/\/www.industrialpumpandvalve.com\/industrial-valve-manufacturer-in-ahmedabad.html\" target=\"_blank\" rel=\"noreferrer noopener\">industrial valve manufacturer in Ahmedabad<\/a> with in-house testing gives you documentation and support that generic imports usually cannot match.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faqs\"><strong>FAQs<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Is a non return valve the same as a check valve?<\/strong><\/h3>\n\n\n\n<p>Yes. &#8220;Non return valve&#8221; and &#8220;check valve&#8221; describe the same function. The naming difference is mostly regional, with &#8220;non return valve&#8221; more common in water and HVAC work and &#8220;check valve&#8221; more common in industrial and process plants.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Can a non return valve replace a pressure relief valve?<\/strong><\/h3>\n\n\n\n<p>No. A non return valve only stops backflow; it does not release pressure. Skipping the pressure relief valve because an NRV is already installed leaves the system without overpressure protection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Which valve should be installed closer to the pump?<\/strong><\/h3>\n\n\n\n<p>The non return valve is typically installed right at or close to the pump discharge to protect the pump from backflow. The pressure relief valve placement depends on the system design and is usually set by the piping and instrumentation diagram (P&amp;ID).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>How often should these valves be inspected?<\/strong><\/h3>\n\n\n\n<p>Most plants inspect both valves during scheduled shutdowns, at least once a year, and more often in high-cycle or corrosive service. A pressure relief valve should also be tested and re-certified on the schedule required by your local safety code.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>What happens if a pressure relief valve is undersized?<\/strong><\/h3>\n\n\n\n<p>An undersized PRV cannot discharge fluid fast enough during an overpressure event, so system pressure keeps climbing past the set point. This is one of the more common causes of pipeline and vessel failure during inspections.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Do residential and industrial systems use the same valve designs?<\/strong><\/h3>\n\n\n\n<p>Not always. Residential and light commercial systems generally use simpler, lower-pressure valve designs, while industrial plants need valves rated for higher pressure, higher temperature, and tougher fluids, along with formal certification.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"final-thoughts\"><strong>Final Thoughts<\/strong><\/h2>\n\n\n\n<p>A pressure relief valve and a non return valve solve two different problems on the same pipeline. One keeps pressure from building past a safe limit; the other keeps flow from running the wrong way. Most well-designed pumping and piping systems need both, sized and specified correctly for the fluid, pressure, and temperature involved.<\/p>\n\n\n\n<p>If you are specifying valves for a new project or replacing worn-out ones, our team can help you match the right pressure relief valve or non return valve to your system. <a href=\"https:\/\/www.industrialpumpandvalve.com\/contact-us.html\" target=\"_blank\" rel=\"noreferrer noopener\">Contact us<\/a> with your requirements, and we will recommend the right fit.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Table of Content If you work around pumps, boilers, or pressurised pipelines, you have probably heard both terms used in the same breath, sometimes even used for the same part by mistake. A pressure relief valve and a non return valve are both automatic valves that need no manual operation, and both are considered safety-related [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":449,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-447","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Pressure Relief Valve vs Non Return Valve: What&#039;s the Difference?<\/title>\n<meta name=\"description\" content=\"Pressure relief valves and non-return valves are often confused, but they do different jobs. 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