... Flange Butterfly Valve:1)Size: DN50 - DN14002)Pressure: PN1.0/1.6 MPa3)Materials:body-DI,WCB,Stainless Steel disc-D Double Flange ... Butterfly Valve:SizeDN40 - DN1400Design StandardAPI 609End flangeEN1092 ,ANSI 125/150# ,DIN2501Face ... the standards of GB, ASME, ANSI, API, BS, DIN Double flange Butterfly valve