... 4. self cleaning function Cast iron rubber lined wafer type butterfly ... , pneumatic Materials---Body : Cast Iron , Ductile Iron , Bronze / Aluminum Iron, SS304Disc: Cast Iron , Ductile Iron , Bronze , SS304Seat: EPDM , ... PTFE , NBR , VITONShaft: Carbon Steel , Stainless SteelCoating: Epoxy Resin Or Other Available On Request Operators---Manual, Electric ...