{"id":88,"count":3,"description":"In the UKSPAR category, threaded check valves are represented by three PN16 models. Fig. C302 \u2014 ball sleeve valve with a cast iron body and a steel ball covered with NBR. Fig. C321 \u2014 rotary stainless steel model with a disc made of EN 1.4301 steel. Fig. C322 \u2014 stainless steel sleeve valve with a disc locking mechanism. All three versions have a threaded connection and tightness class &quot;A&quot;. They differ in design, materials, permissible temperature and list of working media. Current diameters and prices can be viewed in the product cards.\r\n<h2>How a threaded check valve works<\/h2>\r\nThe valve allows flow in one direction only and closes automatically when the medium stops flowing or reverse flow occurs. The inlet pressure moves the ball, disc or spool away from the seat and opens the passage. After the pressure decreases, the closing element returns to the seat under the action of its own weight, flow or spring - depending on the design. This principle helps to maintain the filling of the pipeline, prevent reverse rotation of the pump and separate parts of the system. The valve does not create pressure and does not replace a safety valve. For stable operation, it is necessary to observe the installation direction indicated by the arrow on the body.\r\n<h2>Types of threaded check valves<\/h2>\r\nIn the C302 ball model, the flow lifts the ball and when stopped, it returns to the seat. This design is suitable for the following environments:\r\n<ul>\r\n \t<li>water;<\/li>\r\n \t<li>air;<\/li>\r\n \t<li>waste and sewage water;<\/li>\r\n \t<li>petroleum products within the product parameters.<\/li>\r\n<\/ul>\r\nThe NBR coating ensures contact with the seat and affects the tightness. The rotary C321 has a disc fixed to the stem. When the medium moves, the disc deflects, and when the direction changes, it closes the passage. The C322 also uses a stainless disc, but the exact scheme of the mechanism and the presence of a spring should be checked in the technical data sheet. The spring valve is less dependent on the spatial position, but creates additional resistance to opening.\r\n<h2>How to choose a valve by diameter and working pressure<\/h2>\r\nFirst, determine the pipeline diameter and thread parameters. DN25\u2013DN80 is available for C302, and stainless C321 and C322 are presented in the range of DN15\u2013DN100. All models of the category are marked PN16, but when choosing, you need to take into account the actual operating pressure, temperature and possible water hammer. The minimum difference for opening, pressure loss and flow rate are important. A valve that is too large can operate unstable, and a valve that is too small can create excessive resistance. If the product is installed after the pump, the selection is carried out according to its supply, pressure and start-up mode. For heating systems, the temperature of the coolant is additionally checked.\r\n<h2>Housing and locking mechanism materials<\/h2>\r\nThe valves are available in cast iron and stainless steel versions, so they are selected taking into account the environment, temperature and corrosion resistance requirements. The C302 body is made of high-strength cast iron EN-GJS500-7, and the ball is made of steel EN 1.0619 with NBR. The model is designed for temperatures up to +80 \u00b0C. This version is suitable, in particular, for water and wastewater, if their composition is compatible with the elastomer. In the C321, the body and disc are made of stainless steel EN 1.4301, and the stem is made of EN 1.4401. The C322 body complies with EN 1.4308, the disc with EN 1.4301. For both stainless steel models, the specified temperature is up to +180 \u00b0C, but the permissible mode depends on the environment. Brass and bronze are common in small-diameter coupling fittings, however, this page presents cast iron and stainless steel versions.\r\n<h2>Where to buy a threaded check valve<\/h2>\r\nYou can buy a threaded check valve from UKSPAR with selection for a specific system. For calculation, inform the working medium, diameter and type of thread, maximum pressure and temperature, required mounting position and pump characteristics. Before installation, clean the pipeline, check the flow arrow and use a compatible material to seal the thread. UKSPAR specialists will help you compare ball, rotary and disc options, clarify availability and organize delivery across Ukraine.","link":"https:\/\/ukspar.ua\/en\/zvorotni-klapany-rizbovi\/","name":"Non-return valves are threaded","slug":"zvorotni-klapany-rizbovi","taxonomy":"product_cat","parent":58,"meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/product_cat\/88"}],"collection":[{"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/product_cat"}],"about":[{"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/taxonomies\/product_cat"}],"up":[{"embeddable":true,"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/product_cat\/58"}],"wp:post_type":[{"href":"https:\/\/ukspar.ua\/en\/wp-json\/wp\/v2\/product?product_cat=88"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}