wafer type swing check valve 1.Nominal pressure:PN1.0Mpa 2.Nominal diameter:DN80-600mm wafer type swing check valve1.Nominal pressure:PN1.0Mpa2 ... as the advanced, new and high-tech enterprise.The main products : butterfly valves, gate valves, check valves, air release valves, ... suitable medium: clean water, sewage water, sea water, air, high temperature stove air, gas, steam and different kinds of acid ...