... type swing check valve 1.Nominal pressure:PN1.0Mpa 2.Nominal diameter:DN80-600mm wafer type swing check valve1. ... .The main products : butterfly valves, gate valves, check valves, air release valves, rotating strainers, comb type ... holes, and inserting gates; suitable medium: clean water, sewage water, sea water, air, high temperature stove air, ... motor and hydraulic types. wafer type swing check valve