The pneumatic butterfly valve consists of a pneumatic actuator and a butterfly valve. It uses a circular disc that rotates with the valve stem as a shutter to achieve the activation action. These valves are mainly used as shut-off valves, and can also be designed to have adjustment or section valve and adjustment functions. At present, butterfly valves are used more and more on low-pressure large and medium-diameter pipes.
Pneumatic butterfly valves are classified into stainless steel pneumatic butterfly valve, hard seal pneumatic butterfly valve, soft seal pneumatic butterfly valve, and carbon steel pneumatic butterfly valve. The main advantages of the valve are simple structure, small size and light weight, and low cost. The pneumatic butterfly valve can be installed in the high-altitude dark channel and controlled by the two-position five-way solenoid valve, which is easy to operate. It can also adjust the flow medium.
Pneumatic butterfly valves combine the benefits of the butterfly valve and the pneumatic valve. The butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. Moreover, it can be quickly opened and closed by only rotating 90 degrees, so the operation is simple. The pneumatic valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the disc is a single resistance when the medium flows through the valve body, so the pressure generated by the valve is small, so it has better flow control characteristics. The butterfly valve has two sealing types: a spring seal and a metal seal. As for the elastomeric sealing valve, the sealing ring can be mounted on the valve body or attached to the periphery of the disc.
If a pneumatic butterfly valve is required for flow control, the correct size and type of valve should be chosen. The structural principle of the butterfly valve is especially suitable for making large diameter valves. Butterfly valves are widely used not only in general industries such as petroleum, gas, chemical, and water treatment, but also in cooling water systems for thermal power plants.
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