Double Flange Butterfly Valve:1)Size: DN50 - DN14002)Pressure: PN1.0/ ... body-DI,WCB,Stainless Steel disc-D Double Flange Butterfly Valve:SizeDN40 - DN1200Design StandardAPI 609End flangeEN1092 ,ANSI 125/150# ... produce butterfly valves, check valves, gate valves and so on with the materials of ductile iron, carbon steel, stainless steel to ... of GB, ASME, ANSI, API, BS, DIN Ductile iron Butterfly valve