... , petroleum, petrochemical, heat supply, shipbuilding, medicine and metallurgy industries.Suitable Medium:Water, sewage,sea water, air, foodstuff, oil etc.Working Temperature ... valves, gate valves and so on with the materials of ductile iron, carbon steel, stainless steel to order. Our products are designed ... with the standards of GB, ASME, ANSI, API, BS, DIN Ductile iron Butterfly valve