... Flange Butterfly Valve:SizeDN40 - DN1200Design StandardAPI 609End flangeEN1092 ,ANSI 125/150# ,DIN2501Face to faceEN 558-1, BS5155 , ISO 5752Top flangeISO 5211BodyDuctile iron, ... .Products;We can produce butterfly valves, check valves, gate valves and so on with the materials of ductile iron, carbon steel, stainless ... with the standards of GB, ASME, ANSI, API, BS, DIN Ductile iron Butterfly valve