... Seal a.Ozone and chemical resistance b.High temperature resistance Double Flange Butterfly Valve: SizeDN40 - DN1400Design StandardAPI 609End flangeEN1092 ,ANSI 125/150# , ... electric and pneumatic control actrators.Products;We can produce butterfly valves, check valves, gate valves and so on with the materials of ductile iron ... of GB, ASME, ANSI, API, BS, DIN, JIS etc. Butterfly Valve of Rubber Seal