... pressure:PN1.0Mpa 2.Nominal diameter:DN80-600mm wafer type swing check valve1.Nominal pressure:PN1.0Mpa2.Nominal diameter:DN80-600mm3 ... , gratings, steel penstocks, cool and hot isolating gates, guarding gates, regulating shrinkage holes, and inserting gates; suitable medium: clean water, sewage water, sea ... : manual, motor, pneumatic, hydraulic, motor and hydraulic types. wafer type swing check valve