... pressure:PN1.0Mpa 2.Nominal diameter:DN80-600mm wafer type swing check valve1.Nominal pressure:PN1.0Mpa2.Nominal ... valves, check valves, air release valves, rotating strainers, comb type cleaning machines, gratings, steel penstocks, cool and hot isolating ... gates, regulating shrinkage holes, and inserting gates; suitable medium: clean water, sewage water, sea water, air, high temperature stove ...