Dual Disc Wafer Butterfly Check Valve DN40-1200mm PN(MPa): 1.0/1.6 MOQ:1pc/ ... API,ANSI,ASTM,BS,DIN,JIS,ISO approved double disc check valveFeatures:1)Working temperature: -25*C~120*C2)Applicable medium ... .Top Flange: ISO5211Face to Face: API609, ISO5752 series 20, BS5155Test&Check: API598 double disc check valve