... /2"-2". 4.ISO9001 certification. swing check valve.Product Name: Female threaded swing check valve, swing check valve,check valvesThread Standard: G. NPT, BSPT. ... and some corrosive liquidsTemperature Range: -40C~180CWorking Pressure: 1.6~6.4MPaMain Material: CF8, CF8M, CF3, CF3M, WCBSize: From ... : Nominal pressurePN1.6, 2.5, 4.0.6.4mpaStrength testing pressurePT2.4, 3.8, 6.0, 9.6,Seat testing pressure ...