{"id":6496,"date":"2025-12-21T17:14:00","date_gmt":"2025-12-21T14:14:00","guid":{"rendered":"https:\/\/ukspar.ua\/?p=6496"},"modified":"2026-04-20T17:21:36","modified_gmt":"2026-04-20T14:21:36","slug":"yak-vibrati-kulovij-kran-povnij-posibnik-latun-stal-dn-pn","status":"publish","type":"post","link":"https:\/\/ukspar.ua\/en\/blog\/yak-vibrati-kulovij-kran-povnij-posibnik-latun-stal-dn-pn\/","title":{"rendered":"How to choose a ball valve: a complete guide (brass, steel, DN, PN)"},"content":{"rendered":"<p>Industrial <a href=\"\/en\/krany-kulovi\/\">ball valve<\/a> with tightness class &quot;A&quot; is a critically important element of pipelines. Correct selection of shut-off valves minimizes the risks of cavitation, water hammer and system depressurization under operating load.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is a ball valve and how does it work?<\/h2>\n\n\n\n<p>From a technical point of view, <strong>ball valve<\/strong> \u2014 is a type of shut-off valve, where the shut-off element is a sphere (ball) with a through hole.<\/p>\n\n\n\n<ul>\n<li><strong>Working principle:<\/strong> Turning the ball 90\u00b0 allows you to instantly open or close the flow.<\/li>\n\n\n\n<li><strong>Importantly:<\/strong> The design is designed for only two positions. Using a tap to adjust the flow volume leads to rapid wear of the seals.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Main technical specifications<\/h2>\n\n\n\n<p>When designing highways, engineers rely on two key parameters: <strong>DN<\/strong> and <strong>PN<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Nominal diameter (DN)<\/h3>\n\n\n\n<p><strong>DN (Nominal Diameter)<\/strong> is the nominal diameter of the internal cross-section of the pipe, expressed in millimeters.<\/p>\n\n\n\n<ul>\n<li>This indicator ensures the unification of parts from different manufacturers.<\/li>\n\n\n\n<li>For example, <strong>full-flow valve DN 25<\/strong> mounted on a pipe with a suitable internal diameter of 25 mm, without creating additional flow resistance.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Nominal pressure (PN)<\/h3>\n\n\n\n<p><strong>PN (Pressure Nominal)<\/strong> indicates the maximum permissible operating pressure in bar at an ambient temperature of +20\u00b0C.<\/p>\n\n\n\n<ul>\n<li>Cranes with markings <strong>PN 40<\/strong> capable of withstanding pressures up to 40 bar.<\/li>\n\n\n\n<li>When choosing, it is important to consider the safety factor, since as the temperature increases, the working pressure usually decreases.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Housing materials and their purpose<\/h2>\n\n\n\n<p>Metal models dominate the industry due to their ability to withstand high pressure (up to 160+ bar) and extreme temperatures (over +200\u00b0C).<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><td><strong>Material<\/strong><\/td><td><strong>Application features<\/strong><\/td><td><strong>Advantages<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>Brass<\/strong><\/td><td>Optimal for systems up to <strong>DN 50<\/strong>.<\/td><td>Corrosion resistance, reliability in household networks.<\/td><\/tr><tr><td><strong>Carbon steel<\/strong><\/td><td>High-pressure mains, petroleum products, steam.<\/td><td>High strength, resistance to deformation.<\/td><\/tr><tr><td><strong>Stainless steel<\/strong><\/td><td>Chemical and food industry.<\/td><td>Inertness to aggressive environments, no oxidation.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Selecting a crane by type of environment<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">For water supply<\/h3>\n\n\n\n<p>The best choice is <strong>nickel-plated brass faucet<\/strong> with wear-resistant seat rings (PTFE). To minimize hydraulic losses, it is recommended to use only full-bore models.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">For gas supply<\/h3>\n\n\n\n<p>Gas fittings undergo strict certification. Such valves have an elongated thread to increase the resistance of the connection to vibrations and are often marked with a yellow lever. On main gas pipelines they are used <strong>welded steel modifications<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">For heating systems<\/h3>\n\n\n\n<p>Brass products with increased heat resistance are suitable for autonomous systems. In large centralized networks, they are used <strong>all-welded carbon steel cranes<\/strong>, capable of withstanding significant thermal expansion.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Connection types<\/h2>\n\n\n\n<p>The installation method is selected depending on the diameter and maintenance requirements:<\/p>\n\n\n\n<ul>\n<li><strong>Coupling (threaded):<\/strong> For small diameters (up to DN 50).<\/li>\n\n\n\n<li><strong>Flanged:<\/strong> For industrial systems where quick dismantling of the assembly is required.<\/li>\n\n\n\n<li><strong>Welded:<\/strong> For the most critical areas where absolute tightness for decades is required.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Typical mistakes when choosing<\/h2>\n\n\n\n<ol>\n<li><strong>Flow adjustment:<\/strong> Attempting to use a ball valve as a throttle (half-open position) leads to cavitation wear of the ball and loss of tightness.<\/li>\n\n\n\n<li><strong>Selection &quot;by eye&quot;:<\/strong> Neglecting engineering calculations (pressure, temperature, chemical compatibility) creates a risk of accident.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>A high-quality ball valve is a guarantee of the safety of the entire facility. In the assortment <strong>UKSPAR<\/strong> Certified fittings for any technical tasks are presented. Our specialists will help you make an accurate selection according to your project documentation and ensure shipment in the shortest possible time.<\/p>","protected":false},"excerpt":{"rendered":"<p>\u041f\u0440\u043e\u043c\u0438\u0441\u043b\u043e\u0432\u0438\u0439 \u043a\u0443\u043b\u044c\u043e\u0432\u0438\u0439 \u043a\u0440\u0430\u043d \u0456\u0437 \u043a\u043b\u0430\u0441\u043e\u043c \u0433\u0435\u0440\u043c\u0435\u0442\u0438\u0447\u043d\u043e\u0441\u0442\u0456 \u00ab\u0410\u00bb \u2014 \u0446\u0435 \u043a\u0440\u0438\u0442\u0438\u0447\u043d\u043e \u0432\u0430\u0436\u043b\u0438\u0432\u0438\u0439 \u0435\u043b\u0435\u043c\u0435\u043d\u0442 \u0442\u0440\u0443\u0431\u043e\u043f\u0440\u043e\u0432\u0456\u0434\u043d\u0438\u0445 \u043c\u0430\u0433\u0456\u0441\u0442\u0440\u0430\u043b\u0435\u0439. \u041f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u0438\u0439 \u043f\u0456\u0434\u0431\u0456\u0440 \u0437\u0430\u043f\u0456\u0440\u043d\u043e\u0457 \u0430\u0440\u043c\u0430\u0442\u0443\u0440\u0438 \u043c\u0456\u043d\u0456\u043c\u0456\u0437\u0443\u0454 \u0440\u0438\u0437\u0438\u043a\u0438 \u0432\u0438\u043d\u0438\u043a\u043d\u0435\u043d\u043d\u044f \u043a\u0430\u0432\u0456\u0442\u0430\u0446\u0456\u0457, \u0433\u0456\u0434\u0440\u043e\u0443\u0434\u0430\u0440\u0456\u0432 \u0442\u0430 \u0440\u043e\u0437\u0433\u0435\u0440\u043c\u0435\u0442\u0438\u0437\u0430\u0446\u0456\u0457 \u0441\u0438\u0441\u0442\u0435\u043c\u0438 \u043f\u0456\u0434 \u0440\u043e\u0431\u043e\u0447\u0438\u043c \u043d\u0430\u0432\u0430\u043d\u0442\u0430\u0436\u0435\u043d\u043d\u044f\u043c. \u0429\u043e \u0442\u0430\u043a\u0435 \u043a\u0443\u043b\u044c\u043e\u0432\u0438\u0439 \u043a\u0440\u0430\u043d \u0442\u0430 \u044f\u043a \u0432\u0456\u043d \u043f\u0440\u0430\u0446\u044e\u0454 \u0417 \u0442\u0435\u0445\u043d\u0456\u0447\u043d\u043e\u0433\u043e \u043f\u043e\u0433\u043b\u044f\u0434\u0443, \u043a\u0443\u043b\u044c\u043e\u0432\u0438\u0439 \u043a\u0440\u0430\u043d \u2014 \u0446\u0435 \u0440\u0456\u0437\u043d\u043e\u0432\u0438\u0434 \u0437\u0430\u043f\u0456\u0440\u043d\u043e\u0457 \u0430\u0440\u043c\u0430\u0442\u0443\u0440\u0438, \u0434\u0435 \u0437\u0430\u043f\u0456\u0440\u043d\u0438\u043c \u0435\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u043c \u0441\u043b\u0443\u0433\u0443\u0454 \u0441\u0444\u0435\u0440\u0430 (\u043a\u0443\u043b\u044f) \u0437 \u043d\u0430\u0441\u043a\u0440\u0456\u0437\u043d\u0438\u043c [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6498,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[809],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/posts\/6496"}],"collection":[{"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/comments?post=6496"}],"version-history":[{"count":3,"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/posts\/6496\/revisions"}],"predecessor-version":[{"id":6500,"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/posts\/6496\/revisions\/6500"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/media\/6498"}],"wp:attachment":[{"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/media?parent=6496"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/categories?post=6496"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/tags?post=6496"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}