Wcb Safety Back Flow Preventor Restrictor Anti Pollution Cut off Check Valve (GHS11X)

Anti-Pollution Cut off Check Valve with Atmospheric Vent Model NO. GHS11X Conventional type anti-pollution cut off valve is composed of two non-return valves in tandem connection.This Model GHS11X safety type anti-pollution cut off valve is with an extra drainage and pressure relief device at the secondary non-return system. In this way, even if two non-return sealings are broken at the same time, it still can prevent back flow.It is a safety device to prevent back flow pollution in pipeline of daily drinking water system and it keeps drinking water safe and healthy. Safety type anti-pollution cut off valve is composed of two non-return valves and one drainage and pressure relief device. 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 pressure relief device mainly consisted of valve bonnet, diaphragm, gasket, drainage outlet, spring and air block device.  Medium applicableWater etcTemperatureapplicable0 ~ 80ºCNominal PressurePN10--PN40(CL150, CL300)Nominal DiameterDN40--DN600Flange DimensionASME B16.42, BS4504, ISO2531, ISO7005 and other standards conforming to the requirementsThreadtypeISO, NPT, BSP etcFace to Face LengthANSI B16.10, API594,BS5155, ISO5752, DIN3352 etc.MaterialBody, CoverDisc, SeatDrainage deviceStemGasketSpringGray Cast iron,Ductile Iron,Cast SteelBrass  etcBrassStainless steelCast steel,Stainless steelStainless steelNBRStainless steel  /* 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