... gate valve 2.body sprayed by epoxy resin powder 3.wafer type wedge 4.stainless steel wedge ductile cast iron knife gate ... valve.. Knife type gate valve, quickly cut off water, ... with EPDM, excellent anti-corrosion,wafer tpye wedge gate valve.. Our company(soochow yueda valve co., ltd ... certificate of ISO 9001. ductile cast iron knife gate valve