... Ozone and chemical resistance b.High temperature resistance c. Excellent weather and water resistance Butterfly Valve: SizeDN40 - DN1400Design StandardAPI ... can produce butterfly valves, check valves, gate valves and so on with the materials of ductile iron, carbon steel ... and manufactured in accordance with the standards of GB, ASME, ANSI, API, BS, DIN, JIS etc. various high quality Butterfly valve