{"id":71168,"date":"2026-05-08T15:43:32","date_gmt":"2026-05-08T12:43:32","guid":{"rendered":"https:\/\/unox.com.tr\/why-are-pressura-end-temperature-critical-when-selecting-a-valve\/"},"modified":"2026-05-08T17:12:43","modified_gmt":"2026-05-08T14:12:43","slug":"why-are-pressura-end-temperature-critical-when-selecting-a-valve","status":"publish","type":"post","link":"https:\/\/unox.com.tr\/en\/why-are-pressura-end-temperature-critical-when-selecting-a-valve\/","title":{"rendered":"Why are pressure and temperature critical when selecting a valve?"},"content":{"rendered":"\n<p class=\"wp-block-wd-paragraph wd-dbd9b960\">In industrial facilities, valve selection is not limited only to connection diameter or valve type. The system\u2019s operating pressure and temperature values are among the most critical criteria in proper valve selection. Valves chosen based on incorrect pressure or temperature ratings can lead to leaks, performance loss, equipment failures, and serious safety risks.  <\/p>\n\n<p class=\"wp-block-wd-paragraph wd-6d5b478b\">So why are pressure and temperature so important in <a href=\"https:\/\/www.unoxonline.com.tr\/urun-kategori\/vana\/\" data-type=\"link\" data-id=\"https:\/\/www.unoxonline.com.tr\/urun-kategori\/vana\/\" rel=\"nofollow noopener\" target=\"_blank\">valve <\/a>selection?<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-e5c01db4\"><\/div>\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 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-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/unox.com.tr\/en\/why-are-pressura-end-temperature-critical-when-selecting-a-valve\/#Why_is_Pressure_Important_in_Industrial_Valves\" >Why is Pressure Important in Industrial Valves?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/unox.com.tr\/en\/why-are-pressura-end-temperature-critical-when-selecting-a-valve\/#What_Does_the_PN_Rating_Mean\" >What Does the PN Rating Mean?<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/unox.com.tr\/en\/why-are-pressura-end-temperature-critical-when-selecting-a-valve\/#How_Does_Temperature_Affect_Valve_Performance\" >How Does Temperature Affect Valve Performance?<\/a><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/unox.com.tr\/en\/why-are-pressura-end-temperature-critical-when-selecting-a-valve\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_is_Pressure_Important_in_Industrial_Valves\"><\/span><strong>Why is Pressure Important in Industrial Valves?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p class=\"wp-block-wd-paragraph wd-d6c69b62\">A <a href=\"https:\/\/unox.com.tr\/en\/valve-group\/\" data-type=\"link\" data-id=\"https:\/\/unox.com.tr\/vana\/\">valve <\/a>controls the fluid passing through it under a certain pressure. When the system\u2019s operating pressure exceeds the valve\u2019s design strength limit, serious problems can occur. <\/p>\n\n<p class=\"wp-block-wd-paragraph wd-66aece34\">For this reason, one of the first factors to consider in valve selection is the operating pressure.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-ecc82f7e\"><\/div>\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Does_the_PN_Rating_Mean\"><\/span><strong>What Does the PN Rating Mean?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n<p class=\"wp-block-wd-paragraph wd-aa482a52\">You often see on valves:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>PN16<\/li>\n\n\n\n<li>PN25<\/li>\n\n\n\n<li>PN40<\/li>\n<\/ul>\n\n<p class=\"wp-block-wd-paragraph wd-19caeac5\">Values such as these indicate the maximum nominal pressure that the valve can withstand.<\/p>\n\n<p class=\"wp-block-wd-paragraph wd-bba35837\">For example:<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>PN Value<\/strong><\/td><td><strong>Maximum Pressure<\/strong><\/td><\/tr><\/thead><tbody><tr><td>PN16<\/td><td>16 bar<\/td><\/tr><tr><td>PN25<\/td><td>25 bar<\/td><\/tr><tr><td>PN40<\/td><td>40 bar<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-wd-paragraph wd-04b2ecf1\">However, the important point to note here is:<\/p>\n\n<p class=\"wp-block-wd-paragraph wd-fc1a17bc\">As temperature increases, the pressure that a valve can withstand may decrease.<\/p>\n\n<p class=\"wp-block-wd-paragraph wd-f2102ef7\">For this reason, selecting a valve based solely on its PN rating is not correct.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-e5c07380\"><\/div>\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Does_Temperature_Affect_Valve_Performance\"><\/span><strong>How Does Temperature Affect Valve Performance?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n<p class=\"wp-block-wd-paragraph wd-d80fc24c\">High temperature has a direct impact on the valve body and sealing materials.<\/p>\n\n<p class=\"wp-block-wd-paragraph wd-ebbf8491\">In particular:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>steam systems,<\/li>\n\n\n\n<li>thermal oil lines,<\/li>\n\n\n\n<li>chemical plants,<\/li>\n\n\n\n<li>in high-temperature processes,<\/li>\n<\/ul>\n\n<p class=\"wp-block-wd-paragraph wd-3924cc26\">incorrect valve selection can lead to serious failures.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-4a633f75\"><\/div>\n\n<p class=\"wp-block-wd-paragraph wd-791ca5d2\"><strong>Risks Caused by High Temperature<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-48ebc150\"><strong>Gasket Deformation<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-69aaefbe\">An unsuitable gasket material may harden or melt at high temperatures.<\/p>\n\n<p class=\"wp-block-wd-paragraph wd-34754a60\">This situation:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>leads to loss of sealing,<\/li>\n\n\n\n<li>leakage,<\/li>\n\n\n\n<li>system inefficiency,<\/li>\n<\/ul>\n\n<p class=\"wp-block-wd-paragraph wd-b01443d0\">occurs.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-f135e889\"><\/div>\n\n<p class=\"wp-block-wd-paragraph wd-161aae4a\"><strong>Body Expansion<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-d5351fb7\">Metal bodies expand under temperature.<\/p>\n\n<p class=\"wp-block-wd-paragraph wd-8d39cd40\">Poor-quality or unsuitable valve bodies:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>cracking,<\/li>\n\n\n\n<li>deformation,<\/li>\n\n\n\n<li>mechanical stress<\/li>\n<\/ul>\n\n<p class=\"wp-block-wd-paragraph wd-cf72429c\">may occur.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-20712f44\"><\/div>\n\n<p class=\"wp-block-wd-paragraph wd-966c76ed\"><strong>Actuator Problems<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-c6eb28c5\">Electric and pneumatic actuators can be affected by high temperatures.<\/p>\n\n<p class=\"wp-block-wd-paragraph wd-52329a43\">In particular:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>motor performance,<\/li>\n\n\n\n<li>seals<\/li>\n\n\n\n<li>electronic components<\/li>\n<\/ul>\n\n<p class=\"wp-block-wd-paragraph wd-2441db2e\">can be damaged.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-9d0cd91e\"><\/div>\n\n<p class=\"wp-block-wd-paragraph wd-45461b80\"><strong>Pressure and Temperature Must Be Evaluated Together<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-271e3da8\">Many users focus only on operating pressure. However, in industrial systems, pressure and temperature must be evaluated together. <\/p>\n\n<p class=\"wp-block-wd-paragraph wd-0e7df5c4\">For example:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>A pressure of 10 bar may seem low,<\/li>\n\n\n\n<li>but if the system operates at 220\u00b0C,<\/li>\n<\/ul>\n\n<p class=\"wp-block-wd-paragraph wd-456970e4\">a standard valve may not be sufficient.<\/p>\n\n<p class=\"wp-block-wd-paragraph wd-45e01368\">For this reason, the manufacturer\u2019s technical datasheets must always be reviewed.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-ecc0812c\"><\/div>\n\n<p class=\"wp-block-wd-paragraph wd-9feeb59d\"><strong>Consequences of Incorrect Valve Selection<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-ac2da288\">Valves that are not suitable for the pressure and temperature conditions can lead to the following problems:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Valve leakage<\/li>\n\n\n\n<li>Gasket failure (burning)<\/li>\n\n\n\n<li>Sudden pressure drops<\/li>\n\n\n\n<li>Pipeline damage<\/li>\n\n\n\n<li>Actuator failures<\/li>\n\n\n\n<li>Energy inefficiency<\/li>\n\n\n\n<li>Unplanned production downtime<\/li>\n<\/ul>\n\n<p class=\"wp-block-wd-paragraph wd-5288972f\">In particular, the safety risk is much greater in high-pressure systems.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-ccd9ecfc\"><\/div>\n\n<p class=\"wp-block-wd-paragraph wd-8a301e35\"><strong>In Which Systems Is It More Critical?<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-04d39588\"><strong>Steam Lines<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-1153e54e\">Because high temperature and pressure occur together, proper valve selection is critically important.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-62e88738\"><\/div>\n\n<p class=\"wp-block-wd-paragraph wd-1b4d660e\"><strong>Thermal Oil Systems<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-029e72fd\">At temperatures above 300\u00b0C, special valve and gasket constructions are required.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-e21e3ad3\"><\/div>\n\n<p class=\"wp-block-wd-paragraph wd-0fa9771a\"><strong>Chemical Plants<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-d939d0a5\">Temperature resistance is as important as chemical resistance.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-d374d77d\"><\/div>\n\n<p class=\"wp-block-wd-paragraph wd-ddd474b9\"><strong>Compressed Air Systems<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-1872e433\">Sudden pressure fluctuations can affect valve lifespan.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-315601f8\"><\/div>\n\n<p class=\"wp-block-wd-paragraph wd-2fd65468\"><strong>What Should Be Considered for Proper Valve Selection?<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-274bf13a\"><strong>1. Operating Pressure<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-cb53706b\">The system\u2019s maximum operating pressure must be determined.<br\/><\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-4db7e7d7\"><\/div>\n\n<p class=\"wp-block-wd-paragraph wd-a310b72d\"><strong>2. Operating Temperature<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-dfbdeeb7\">Minimum and maximum temperature values must be determined.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-c494d44c\"><\/div>\n\n<p class=\"wp-block-wd-paragraph wd-5c3c6491\"><strong>3. Fluid Type<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-b614c1d9\">The properties of the fluid\u2014such as water, steam, gas, chemicals, or thermal oil\u2014must be taken into account.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-ae386e64\"><\/div>\n\n<p class=\"wp-block-wd-paragraph wd-b8f23108\"><strong>4. Gasket Material<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-ce275010\">Gasket types such as EPDM, PTFE, and Viton should be selected according to temperature.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-777ba661\"><\/div>\n\n<p class=\"wp-block-wd-paragraph wd-ba8f9300\"><strong>5. Valve Body Material<\/strong><\/p>\n\n<ul class=\"wp-block-list\">\n<li>Stainless steel<br\/> <br\/><\/li>\n\n\n\n<li>Cast iron<\/li>\n\n\n\n<li>Brass<\/li>\n\n\n\n<li>Carbon steel<\/li>\n<\/ul>\n\n<p class=\"wp-block-wd-paragraph wd-b8599229\">materials like these should be selected according to the application.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-bc6327bb\"><\/div>\n\n<p class=\"wp-block-wd-paragraph wd-22c53dfe\"><strong>Importance of Safety in Industrial Systems<\/strong><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-cac73c0f\">Incorrect valve selection not only damages equipment but can also create serious occupational safety risks.<\/p>\n\n<p class=\"wp-block-wd-paragraph wd-5dcd045f\">In particular:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>high-pressure steam,<\/li>\n\n\n\n<li>hot oil,<\/li>\n\n\n\n<li>chemical fluids,<\/li>\n<\/ul>\n\n<p class=\"wp-block-wd-paragraph wd-6df75390\">in facilities handling these fluids, proper valve selection is critically important.<\/p>\n\n<div class=\"wp-block-wd-divider wd-style-line wd-d3439323\"><\/div>\n\n<h5 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span><strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h5>\n\n<p class=\"wp-block-wd-paragraph wd-ba01b52a\">In industrial facilities, pressure and temperature values in valve selection must always be evaluated together. Using an unsuitable valve for the system can lead to leaks, equipment failures, energy losses, and safety risks. <\/p>\n\n<p class=\"wp-block-wd-paragraph wd-84eba337\">For proper valve selection:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>operating conditions,<\/li>\n\n\n\n<li>fluid type,<\/li>\n\n\n\n<li>temperature,<\/li>\n\n\n\n<li>pressure,<\/li>\n\n\n\n<li>gasket and body material<\/li>\n<\/ul>\n\n<p class=\"wp-block-wd-paragraph wd-3317ec6b\">must be analyzed in detail.<br\/> <br\/><\/p>\n\n<p class=\"wp-block-wd-paragraph wd-2e219892\">For long-lasting, safe, and efficient systems, valve solutions suitable for the application should be preferred.<\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Why is Pressure Important in Industrial Valves? What Does the PN Rating Mean? PN ValueMaximum PressurePN1616 barPN2525 barPN4040 bar How<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1715],"tags":[],"class_list":["post-71168","post","type-post","status-publish","format-standard","hentry","category-unox-blog"],"_links":{"self":[{"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/posts\/71168","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=71168"}],"version-history":[{"count":1,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/posts\/71168\/revisions"}],"predecessor-version":[{"id":71169,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/posts\/71168\/revisions\/71169"}],"wp:attachment":[{"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/media?parent=71168"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/categories?post=71168"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unox.com.tr\/en\/wp-json\/wp\/v2\/tags?post=71168"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}