... CLASS 1500 Size:10",Pressure Seal Cover High Pressure Swing Check ValveCharacteristic:1, threads: BSPT,BSP,NPT,DIN259/29992, silica ... , tourism building, industrial pipeline system, marine pipeline system, heating supply, gas pipeline system, and industrial petroleum pipeline system etc.Advantages: Strong tensile strengthSafe ... resistance against aging and hygienic. High Pressure Swing Check Valve