Anti-Pollution Cut off Valve (NPT)

Valve Standard:Conventional type anti-pollution cut off valve is composed of two check valves in tandem connection.Safety type anti-pollution cut off valve is to add a drainage and decompression device to the secondary check valve system. In this case, even if all the secondary check seals are broken together, it still can function to prevent back flow. Therefore, it is a safety device to prevent back flow pollution in pipeline of daily drinking water system. Safety type anti-pollution cut off valve is composed of secondary check valve and a drainage and decompression system. The upper cavity connects with the inlet of first-stage non-return system. The first and second stage check valve system mainly consists of valve body, inlet connector, disc, gasket, spring, etc. Drainage and decompression system mainly consists of valve bonnet, diaphragm, gasket, outlet, spring and air block device. Suitable MediumWater, Oil, Gas and etc.Main materialPN10--PN25CAST IRON,ASTM A216 WCB, WCC, WC6, SS304, SS316, CF8, ETC.Suitable Temperature≤80Nominal PressureNominal DiameterDN40--DN600Flange DimensionASME B16.5, BS4504, ISO2531, ISO7005 and other standards conforming to the requirementsFace to Face LengthAPI594,BS5155, ISO5752, DIN3352 and other standards conforming to the requirements  /* March 10, 2023 17:59:20 */!function(){function s(e,r){var a,o={};try{e&&e.split(",").forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1