... 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 - DN1200Design StandardAPI 609End flangeEN1092 ,ANSI 125/150# ,DIN2501Face to faceEN 558-1, BS5155 , ISO 5752Top flangeISO 5211BodyDuctile iron, ... the standards of GB, ASME, ANSI, API, BS, DIN Ductile iron Butterfly valve