... Nominal pressure:PN1.0Mpa 2.Nominal diameter:DN80-600mm wafer type swing check valve1.Nominal pressure:PN1.0Mpa2.Nominal diameter: ... % of the traditional Non - return valves light one the whole weightis 20% of the traditional.It looks beautiful in the ... gate valves, check valves, air release valves, rotating strainers, comb type cleaning machines, gratings, steel penstocks, cool and hot isolating gates ...