... .Nominal pressure:PN1.0Mpa 2.Nominal diameter:DN80-600mm wafer type swing check valve1.Nominal pressure:PN1.0Mpa2.Nominal diameter:DN80 ... valves, check valves, air release valves, rotating strainers, comb type cleaning machines, gratings, steel penstocks, cool and hot isolating gates, guarding gates ... methods: manual, motor, pneumatic, hydraulic, motor and hydraulic types. wafer type swing check valve