... /25, ANSI B16.1, BS4504, ISO PN16 Wafer Type Double Disc Check ValveStandard:Design standard conform to: MSS SP-67, API609, EN593Connection ... , ISO5752 series 20, BS5155Test standard conform to: API598Design characters:Check valve is used for preventing the back flow of medium in pipelines and ... Diameter: DN40-DN1200 Nominal Pressure PN (MPa): 1.0, 1.6, 2.0, 2.5Testing pressure (water) Ps (MPa) Body ...