... /10-20days API,ANSI,ASTM,BS,DIN,JIS,ISO approved double disc check valveFeatures:1)Working temperature: -25*C~120*C2 ... : GG25, HT200, WCB, SS304Plate: GGG40+EPOXYHinge Stem: SS304Stop Stem: SS304Body Seat: VitonEye Bolt: Steel, Carbon SteelSpring Bearing: PTFEBody Bearing: PTFEPlug: Steel ... : ISO5211Face to Face: API609, ISO5752 series 20, BS5155Test&Check: API598 double disc check valve