... ")~DN1000(48") Working Temperature: -15 degree~135 degree Wafer Butterfly Valve Size: DN50(2")~DN1000(48") Working Temperature: -15 C degree ... . Body: Cast iron, ductile iron, WCB, S. S304, S. S316, bronze 7. Disc: Ductile iron, SS304, SS316 8. Seat: EPDM, NBR ... , gearbox, pneumatic, electric 13. Certificate: CE and ISO Wafer Butterfly Valve