... certificate Pneumatic Knife gate valve, wafer type knife gate valve, Lug knife Gate valve.,Valve,Cast steel knife gate valve, Stainless steel knife gate valveSpecifications:Design and manufacture ... slag.Materials of main parts Body,cover Gate Stem Seal surfacestainless steel,carbon steel,cast iron stainless steel stainless steel Rubber,TPFE,stainless steel,hard alloy ( function ...