Pneumatic butterfly valve
It is a pneumatic valve that uses a circular butterfly plate that rotates with the valve body to open and close to achieve the activation action. It is mainly used as a cut-off valve. It can also be designed to have the function of regulation or segment valve and regulation. Currently, butterfly valves are increasingly used on low-pressure large and medium-diameter pipelines.
The butterfly plate of the butterfly valve is installed in the diameter direction of the pipe. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between ~. When rotated, the valve is fully open.
Detailed introduction of pneumatic butterfly valve
Main advantages of butterfly valve
Simple structure, small size, light weight and low cost. This feature of pneumatic butterfly valve is particularly significant. It is installed in a high-altitude dark channel and passes through the two-position five-way The solenoid valve control is easy to operate and can also adjust the flow medium.
The fluid resistance is small. The effective flow area of medium and large diameter pneumatic butterfly valves is large when fully open. The opening and closing are quick and labor-saving. The opening and closing of the disc lever can be completed by rotating the angle. Due to the medium force of the disc levers on both sides of the rotating shaft, They are close to equal, but the torque generated is in the opposite direction, so the opening and closing torque is small, and good sealing can be achieved under low pressure.
The sealing materials of the butterfly valve include nitrile rubber, fluorine rubber, edible rubber, and are lined with PTFE, so the sealing performance is good. Among them, the hard-sealing butterfly valve is a soft and hard laminated metal sheet, which has the advantages of metal hard sealing and elastic sealing. It has excellent sealing performance regardless of low temperature conditions.
When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body. Therefore, the pressure drop generated by the valve is very small, so it has good flow control characteristics. Butterfly valves have two sealing types: elastic seal and metal seal. For elastic sealing valves, the sealing ring can be embedded in the valve body or attached to the periphery of the butterfly plate.
Valves with metal seals generally have a longer life than valves with elastic seals, but it is difficult to achieve complete sealing. Metal seals can adapt to higher operating temperatures, while elastic seals have the disadvantage of being limited by temperature.
If a butterfly valve is required to be used as a flow control, the main thing is to correctly select the size and type of the valve. The structural principle of butterfly valve is especially suitable for making large diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical industry, and water treatment, but are also used in the cooling water system of thermal power stations.
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