Butterfly valve is a kind of control valve widely used in gas,oil,water,ect. industry area.High performance is our feature. MaterialBody:Cast Iron,Ductile Iron,Cast Steel,Carbon,Steel,Stainless SteelSeat:PTFE,EPDM,NBRStem:Stainless SteelPacking:Soft graghiteHand Lever/Gear:Cast Iron or Ductile IronFlange standradWorking Pressure:PN10,PN16Top Flange:ISO 5211Flange Drilling Standard:BS4504,ANSI B16 ...