... EN 558-1- Wafer Check Valves are short travel Single Disc type.- Wafer Checks with fast acting spring prevents water hammer and ... while Metal to Metal seat is a standard feature.- Single Disc, Wafer Check Valves open at very minimum differential pressure ... refer catalogue for details of Pressure Drop.Hot tags: Single Disc Check Valve, China manufacturer, factory, mill, supplier, cheapSwing Wafer ...