{"id":72973,"date":"2022-04-01T12:57:32","date_gmt":"2022-04-01T09:57:32","guid":{"rendered":"https:\/\/unox.com.tr\/?p=72973"},"modified":"2026-11-12T16:33:10","modified_gmt":"2026-11-12T13:33:10","slug":"what-is-a-check-valve","status":"publish","type":"post","link":"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/","title":{"rendered":"What Is a Check Valve? Types, How It Works and Selection"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"72973\" class=\"elementor elementor-72973 elementor-9875\">\n\t\t\t\t\t\t<section class=\"wd-negative-gap elementor-section elementor-top-section elementor-element elementor-element-7bc71840 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7bc71840\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-489ce641\" data-id=\"489ce641\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-41e130b2 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"41e130b2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A <strong>check valve<\/strong> (also called a non-return valve or one-way valve) is a mechanical valve that lets a liquid or gas flow in one direction only and closes automatically when the flow tries to reverse. It needs no actuator or operator: the pressure of the medium opens it, and a spring, gravity or the reverse flow itself closes it. Check valves protect pumps, compressors, boilers and meters from backflow and keep pipelines full.<\/p>\n<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\">Sayfa \u0130\u00e7eri\u011fi<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#How_Does_a_Check_Valve_Work\" >How Does a Check 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-2\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#What_Is_Cracking_Pressure\" >What Is Cracking Pressure?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#How_Does_a_Check_Valve_Close\" >How Does a Check Valve Close?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Installation_Direction\" >Installation Direction<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Where_Are_Check_Valves_Used\" >Where Are Check Valves Used?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Types_of_Check_Valves\" >Types of Check Valves<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Spring-Loaded_Inline_and_Y-Type_Check_Valves\" >Spring-Loaded Inline and Y-Type Check Valves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Spring-Loaded_Ball_Check_Valves\" >Spring-Loaded Ball Check Valves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Lift_Check_Valves\" >Lift Check Valves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Swing_Check_Valves\" >Swing Check Valves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Wafer_Swing_Check_Valves\" >Wafer Swing Check Valves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Disco_Check_Valves\" >Disco Check Valves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Dual_Plate_Check_Valves\" >Dual Plate Check Valves<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Unox_Check_Valve_Models\" >Unox Check Valve Models<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#How_to_Size_a_Check_Valve\" >How to Size a Check Valve<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#What_to_Consider_When_Selecting_a_Check_Valve\" >What to Consider When Selecting a Check Valve<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Common_Check_Valve_Problems_and_Solutions\" >Common Check Valve Problems and Solutions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Frequently_Asked_Questions\" >Frequently Asked Questions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Can_a_check_valve_fail\" >Can a check valve fail?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#What_happens_if_a_check_valve_is_installed_backwards\" >What happens if a check valve is installed backwards?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Can_a_spring-loaded_check_valve_be_installed_vertically\" >Can a spring-loaded check valve be installed vertically?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/unox.com.tr\/en\/what-is-a-check-valve\/#Does_a_check_valve_prevent_odors\" >Does a check valve prevent odors?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"How_Does_a_Check_Valve_Work\"><\/span>How Does a Check Valve Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When the inlet pressure is high enough, it lifts the disc, ball or flap off its seat and the medium passes through. When the flow stops or reverses, the closing element returns to the seat and blocks the line. Depending on the design, closing is assisted by a spring or by gravity.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Is_Cracking_Pressure\"><\/span>What Is Cracking Pressure?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The minimum inlet pressure at which the valve starts to open is called the <strong>cracking pressure<\/strong>. It depends on the design, the spring and the size of the valve. When selecting a check valve, make sure your system can always produce this pressure; otherwise the valve will not open fully.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_Does_a_Check_Valve_Close\"><\/span>How Does a Check Valve Close?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The valve closes when the inlet pressure falls below the cracking pressure or when pressure builds up on the outlet side.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Installation_Direction\"><\/span>Installation Direction<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Every check valve body carries an arrow showing the flow direction. Check it before installation: a check valve installed backwards blocks the line completely.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Where_Are_Check_Valves_Used\"><\/span>Where Are Check Valves Used?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li><strong>Pump discharge lines:<\/strong> prevent water from flowing back and the pump from spinning in reverse when it stops. In parallel pump systems, each pump outlet gets its own check valve.<\/li>\n<li><strong>Boiler feed lines:<\/strong> stop pressurised boiler water from pushing back into the feed pump.<\/li>\n<li><strong>Steam and condensate lines:<\/strong> prevent backflow in condensate return lines and after <a href=\"https:\/\/unox.com.tr\/en\/steam-traps\/\">steam traps<\/a>. A stainless steel disco check valve is preferred for high temperatures.<\/li>\n<li><strong>Compressor outlets:<\/strong> stop compressed air from returning to the compressor.<\/li>\n<li><strong>Tank and well suction:<\/strong> keep the suction line full, so the pump does not have to re-prime at every start.<\/li>\n<li><strong>Heating, cooling (HVAC) and water treatment:<\/strong> keep the flow direction in circuits and prevent dirty water from mixing with clean water.<\/li>\n<li><strong>Fire protection and process industries:<\/strong> sprinkler systems, chemical, petrochemical and food plants.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Types_of_Check_Valves\"><\/span>Types of Check Valves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Spring-Loaded_Inline_and_Y-Type_Check_Valves\"><\/span>Spring-Loaded Inline and Y-Type Check Valves<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A spring holds the disc against the seat. To open the valve, the inlet pressure must overcome both the cracking pressure and the spring force. Because the spring closes the valve, it can be installed horizontally or vertically.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Spring-Loaded_Ball_Check_Valves\"><\/span>Spring-Loaded Ball Check Valves<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>These spring-loaded check valves use a ball as the closing element.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Lift_Check_Valves\"><\/span>Lift Check Valves<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The disc is guided by the bonnet and moves up and down: it rises to open the orifice and drops to close it. The inlet pressure must overcome gravity and\/or the spring force. The disc must stay exactly on the axis of its guide.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Swing_Check_Valves\"><\/span>Swing Check Valves<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Swing check valves, also called tilting disc check valves, open and close with a disc that swings on a hinge. If there is no spring to help closing, the installation direction must suit gravity.<\/p>\n<ul>\n<li><strong>Body material:<\/strong> AISI 316, AISI 304, brass; cast iron for large flanged sizes<\/li>\n<li><strong>Size:<\/strong> 1\/2&#8243; \u2013 2&#8243; (threaded)<\/li>\n<li><strong>Working pressure:<\/strong> 16 bar<\/li>\n<li><strong>Working temperature:<\/strong> -10 to +180 \u00b0C<\/li>\n<li><strong>Applications:<\/strong> water and condensate lines, HVAC, mining, textile, chemical, food and marine industries<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Wafer_Swing_Check_Valves\"><\/span>Wafer Swing Check Valves<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Installed between two flanges, the flap opens up to 90\u00b0 with the flow and closes by itself when pressure drops; back pressure presses it onto the seat. Sealing can be metal-to-metal or soft (PTFE, EPDM etc.); soft seals give quiet operation. Compact design, low weight, low pressure drop, easy installation and low cost are the main advantages.<\/p>\n<ul>\n<li><strong>Connection:<\/strong> wafer, DN25 \u2013 DN1000<\/li>\n<li><strong>Working temperature:<\/strong> max. 100 \u00b0C (working pressure 10 bar, max. 16 bar)<\/li>\n<li><strong>Applications:<\/strong> water lines, HVAC, pump lines, mining, textile, chemical, food and marine industries<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Disco_Check_Valves\"><\/span>Disco Check Valves<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Disco check valves are light, easy to install between flanges and suitable for high temperatures, which makes them one of the most versatile check valve types.<\/p>\n<ul>\n<li><strong>Connection:<\/strong> wafer<\/li>\n<li><strong>Body material:<\/strong> AISI 304, AISI 316, brass<\/li>\n<li><strong>Pressure rating:<\/strong> PN40<\/li>\n<li><strong>Size:<\/strong> DN15 \u2013 DN100<\/li>\n<li><strong>Working temperature:<\/strong> max. 300 \u00b0C<\/li>\n<li><strong>Applications:<\/strong> water and steam lines, HVAC, iron and steel, mining, textile, chemical, food and marine industries<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Dual_Plate_Check_Valves\"><\/span>Dual Plate Check Valves<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Two spring-loaded plates close the valve quickly and quietly. Low pressure loss, light weight, short face-to-face length and tight shut-off make them the standard choice for large diameters.<\/p>\n<ul>\n<li><strong>Body material:<\/strong> AISI 304, AISI 316, GG-25 cast iron, GGG-40.3 ductile iron<\/li>\n<li><strong>Connection:<\/strong> wafer, DN50 \u2013 DN600<\/li>\n<li><strong>Pressure rating:<\/strong> 16 bar<\/li>\n<li><strong>Working temperature:<\/strong> max. 110 \u00b0C<\/li>\n<li><strong>Applications:<\/strong> water and steam lines, HVAC, pump lines, iron and steel and process industries<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Unox_Check_Valve_Models\"><\/span>Unox Check Valve Models<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table><thead><tr><th>Model<\/th><th>Type<\/th><th>Key Feature<\/th><\/tr><\/thead><tbody>\n<tr><td><a href=\"https:\/\/unox.com.tr\/en\/stainless-steel-disco-check-valve\/\">Stainless Steel Disco Check Valve<\/a><\/td><td>Spring-loaded disc, wafer<\/td><td>High temperature (max. 300 \u00b0C), any mounting position<\/td><\/tr>\n<tr><td><a href=\"https:\/\/unox.com.tr\/en\/brass-disco-check-valve\/\">Brass Disco Check Valve<\/a><\/td><td>Spring-loaded disc, wafer<\/td><td>Economical choice for water and general piping<\/td><\/tr>\n<tr><td><a href=\"https:\/\/unox.com.tr\/en\/ductile-iron-disco-check-valve\/\">Ductile Iron Disco Check Valve<\/a><\/td><td>Spring-loaded disc, wafer<\/td><td>Ductile iron body<\/td><\/tr>\n<tr><td><a href=\"https:\/\/unox.com.tr\/en\/flanged-swing-check-valve\/\">Swing Check Valve<\/a><\/td><td>Swing<\/td><td>Low pressure loss<\/td><\/tr>\n<tr><td><a href=\"https:\/\/unox.com.tr\/en\/stainless-steel-swing-check-valve\/\">Stainless Steel Swing Check Valve<\/a><\/td><td>Swing<\/td><td>Stainless body for corrosive media<\/td><\/tr>\n<tr><td><a href=\"https:\/\/unox.com.tr\/en\/wafer-swing-check-valve\/\">Wafer Type Swing Check Valve<\/a><\/td><td>Swing, wafer<\/td><td>Compact, fits between flanges<\/td><\/tr>\n<tr><td><a href=\"https:\/\/unox.com.tr\/en\/dual-plate-check-valve\/\">Dual Plate Check Valve<\/a><\/td><td>Dual plate, wafer<\/td><td>Light and quiet in large sizes<\/td><\/tr>\n<tr><td><a href=\"https:\/\/unox.com.tr\/en\/flanged-lift-check-valve\/\">Flanged Lift Check Valve<\/a><\/td><td>Lift<\/td><td>Flanged, tight shut-off<\/td><\/tr>\n<\/tbody><\/table>\n<p>See all models on our <a href=\"https:\/\/unox.com.tr\/en\/check-valves\/\">check valves<\/a> page.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Size_a_Check_Valve\"><\/span>How to Size a Check Valve<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Size a check valve by the flow rate and velocity in the line, not only by the pipe size. In an oversized check valve the disc cannot open fully; it flutters, and the seat and spring wear out early. An undersized valve increases pressure loss. For a detailed calculation, read <a href=\"https:\/\/unox.com.tr\/en\/check-valve-sizes-how-to-determine\/\">how to determine check valve sizes<\/a>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_to_Consider_When_Selecting_a_Check_Valve\"><\/span>What to Consider When Selecting a Check Valve<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Compatibility of the body and seal materials with the medium<\/li>\n<li>Maximum pressure and the correct cracking pressure<\/li>\n<li>Line size and flow rate<\/li>\n<li>Installation position (horizontal or vertical)<\/li>\n<li>Temperature<\/li>\n<li>Access for maintenance and repair<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Common_Check_Valve_Problems_and_Solutions\"><\/span>Common Check Valve Problems and Solutions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The most common problems are noise, water hammer, vibration, backflow, wear and leakage. Most of them come from wrong selection or installation. To prevent backflow and water hammer, choose a fast-closing (spring-loaded) check valve: fast closing prevents pressure surges.<\/p>\n<p><iframe style=\"width:100%;aspect-ratio:16\/9;border:0\" src=\"https:\/\/www.youtube.com\/embed\/Su6y8h1DZFA\" title=\"Unox Valve\" loading=\"lazy\" allowfullscreen><\/iframe><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Can_a_check_valve_fail\"><\/span>Can a check valve fail?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes. The most common causes are dirt caught on the seat, a worn seal and a fatigued spring. Installing a <a href=\"https:\/\/unox.com.tr\/en\/y-type-strainers\/\">Y-strainer<\/a> upstream of the check valve extends its life. For symptoms and solutions, read <a href=\"https:\/\/unox.com.tr\/en\/can-a-check-valve-fail\/\">can a check valve fail?<\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_happens_if_a_check_valve_is_installed_backwards\"><\/span>What happens if a check valve is installed backwards?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>It blocks the flow completely and the line does not work. The arrow on the body shows the flow direction; always check it before installation.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_a_spring-loaded_check_valve_be_installed_vertically\"><\/span>Can a spring-loaded check valve be installed vertically?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes. Spring-loaded disco and wafer check valves close independently of gravity, so they work in horizontal and vertical lines. With swing check valves without a spring, pay attention to the installation direction.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Does_a_check_valve_prevent_odors\"><\/span>Does a check valve prevent odors?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In drain lines, a check valve stops backflow and can reduce odors coming back. For details, read <a href=\"https:\/\/unox.com.tr\/en\/does-a-check-valve-prevent-odors\/\">does a check valve prevent odors?<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>A check valve (also called a non-return valve or one-way valve) is a mechanical valve that lets a liquid or<\/p>\n","protected":false},"author":1,"featured_media":30825,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1736],"tags":[],"class_list":["post-72973","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-control-valve"],"_links":{"self":[{"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/posts\/72973","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/comments?post=72973"}],"version-history":[{"count":7,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/posts\/72973\/revisions"}],"predecessor-version":[{"id":73126,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/posts\/72973\/revisions\/73126"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/media\/30825"}],"wp:attachment":[{"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/media?parent=72973"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/categories?post=72973"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/tags?post=72973"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}