... Design CLASS 1500 Size:10",Pressure Seal Cover High Pressure Swing Check ValveCharacteristic:1, threads: BSPT,BSP,NPT,DIN259/29992, silica ... industry, hospital, hotel, workshops, tourism building, industrial pipeline system, marine pipeline system, heating supply, gas pipeline system, and industrial petroleum ... very strong resistance against aging and hygienic. High Pressure Swing Check Valve