... one kind of ultrathin check valve,its advantage such as simple structure,good appearance ... DN40--1000mm Pressure: PN: 1.0--2.5MPa or Class: 150--300lbs Material: Cast iron, cast steel, carbon steel, stainless ... " or DN50--2000mmPressure: PN: 1.0--2.5MPa or Class: 150--300lbsMaterial: Cast iron, cast steel, carbon steel, stainless steel ... B 16.5Applicable Medium: Oil, water, etc. Wafer swing check valve