Double Flange Butterfly Valve:1)Size: DN50 - DN14002)Pressure: PN1.0/ ... .6 MPa3)Materials:body-DI,WCB,Stainless Steel disc-D Double Flange Butterfly Valve:SizeDN40 - DN1200Design StandardAPI 609End flangeEN1092 ,ANSI 125 ... with the standards of GB, ASME, ANSI, API, BS, DIN Double flange DN1200 Butterfly valve