Dual Disc Wafer Butterfly Check Valve DN40-1200mm PN(MPa): 1.0/ ... -20days API,ANSI,ASTM,BS,DIN,JIS,ISO approved double disc check valveFeatures:1)Working temperature: -25*C~120*C2)Applicable ... medium: Fresh water, sewage, sea water, air, vapor, oils, gas etc.3)Materials:Body: GG25, HT200, WCB ... to Face: API609, ISO5752 series 20, BS5155Test&Check: API598 double disc check valve