... Wafter Butterfly Check Valve DN50-800mm PN(MPa): 1.0/1.6 API,ANSI,ASTM,DIN,BS,JIS approved wafer type double ... Carbon SteelSpring Bearing: PTFEBody Bearing: PTFEPlug: Steel, Carbon SteelStandard:Design Standard: MSS SP-67, API609, EN593 Flange End: DIN, ANSI, ... BS, ISO, JIS.Top Flange: ISO5211Face to Face: API609, ISO5752 series 20, BS5155Test&Check: API598 Wafer Type Check Valve