Cast Steel Wafer Type Knife Gate Valve 1.Size:3"-80" 2.Pressure:Class150/300 ... Material:Carbon steel,stainless steel Cast Steel Wafer Type Knife Gate Valve1.Size:2"-80",2.Pressure:Class150,Class 300. ... alloy steel.4.Seal: Rubber, PTFE, Stainless steel, Hard Alloy5.Operator:Handwheel,worm gear,electric,pneumatic,hydraulic.6.Connection type:wafer ... API 600 and API 6D Cast Steel Wafer Type Knife Gate Valve