Pneumatic butterfly valves are applied on system pipelines in many fields like petrol oil,chemistry,food,medicines,paper-making, Pneumatic butterfly valves are applied on system pipelines in many fields like petrol oil,chemistry,food,medicines,paper-making,water power,ship-building,plumbing,metallurgy and power source.They can also be applied in many corrosive gases,liquids,half liquids and solid ...