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