... b.High temperature resistance c. Excellent weather and water resistance Double Flange Butterfly Valve: SizeDN40 - DN1400Design StandardAPI 609End flangeEN1092 ,ANSI 125 ... control actrators.Products;We can produce butterfly valves, check valves, gate valves and so on with the materials of ductile iron ... , ASME, ANSI, API, BS, DIN, JIS etc. various high quality Double Flange Butterfly valve