1.Double Shaft Flanged Butterfly Valves 2. Ductile Iron Disc 3. PTFE Seat ... .Operate:Manual,gear 5.Pressure:PN0.6-1.6 Mpa Double Shaft Butterfly Valves with Ductile Iron Disc and PTFE SeatDesign to ... nylon-coated), SS 304, 304L, 316, and 316L Seat: PTFE Shaft: SS410, SS416 Pin: SS316 O-ring: NBR, EPDM, Neoprene, and ...