The structure of the pneumatic butterfly valve

  Pneumatic butterfly valve consists of pneumatic actuator and butterfly valve. Pneumatic butterfly valve uses circular disc that rotates along valve stem to open or close. Pneumatic valve that realizes opening action is main used as block valve, it also can be designed to have adjustment function or be the section valve with regulating function. At present, butterfly valve is more and more used in pipeline that has low pressure and large-middle diameter .Pneumatic butterfly valve categories: stainless steel pneumatic butterfly valve, hard sealing pneumatic butterfly valve, soft sealing pneumatic butterfly valve, carbon steel material pneumatic butterfly valve.

 The working principle of pneumatic butterfly valve

   Butterfly valve has simple structure, small volume, light weight, only a few parts. And only need to rotate 90 ° can it rapidly open or close, operation is simple,at the same time, the electric valve has good fluid control characteristics. When butterfly valve is in fully open position, the butterfly plate thickness is the only resistance for medium flowing through the body, thus pressure drop produced by the valve is small, so it has good flow control characteristics. Butterfly valves have elastic packing and metal hardware sealing two types. Elastic sealing valve, it’s sealing ring can be embedded in the body or attached to the butterfly plate peripheral. If butterfly valve is used for flow control, the main job is to choose size and type of valve rightly. Structure principle of butterfly valve is especially suitable for production of large diameter valves. Butterfly valve is widely used not only in the oil, gas, chemical industry, water treatment and other general industrial, but also in cooling water system of thermal power plants.