What is the principle of pneumatic plastic PVC butterfly valve

Update:25 Sep 2020

Principle of pneumatic plastic PVC butterfly valve:
Pneumatic plastic PVC butterfly valve is a pneumatic valve that uses a circular butterfly plate that rotates with the valve man to open and close to achieve activation. It is mainly used as a cut-off valve and can also be designed to have the function of adjustment or segment valve. The use of low pressure large and medium diameter pipelines is increasing. The main advantages of the pneumatic plastic PVC butterfly valve are simple structure, small size and light weight, low cost. The pneumatic butterfly valve is particularly prominent. It is installed in a dark tunnel at high altitude and is controlled by a two-position five-way solenoid valve. It is easy to operate and can also adjust the flow medium. Pneumatic plastic PVC butterfly valve has low fluid resistance. The effective flow area of ​​the medium and large diameter pneumatic butterfly valve is large when fully opened, and the opening and closing is quick and labor-saving. The opening and closing of the plate can be completed by rotating 90 degrees, due to the role of the plate wrench on both sides of the shaft The force is nearly equal, but the torque generated is opposite, so the opening and closing torque is small, and good sealing can be achieved under low pressure. The pneumatic plastic PVC butterfly valve sealing materials include nitrile rubber, fluorine rubber, edible rubber, and PTFE lined for sealing performance. Good, among them the hard-seal disc valve is a soft and hard laminated metal sheet with the important advantages of metal hard seal and elastic seal, and it has excellent sealing performance regardless of low temperature.

Pneumatic plastic PVC butterfly valve structure principle and applicable environmental analysis:

The butterfly plate of the pneumatic plastic PVC butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When the rotation reaches 90°, the valve is fully opened. Pneumatic plastic PVC butterfly valve has simple structure, small size and light weight. It is composed of a few parts. Moreover, it can be opened and closed quickly by rotating 90°, and the operation is simple. At the same time, the electric valve has good fluid control characteristics. When the pneumatic plastic PVC 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, so the pressure drop generated by the valve is small, so it has better flow control characteristics. The butterfly valve has two sealing types: elastic seal and metal seal. Elastic sealing valve, 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 a complete seal. The metal seal can adapt to higher working temperature, while the elastic seal has the defect of being limited by temperature. If the pneumatic plastic PVC 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 structure principle of the butterfly valve is especially suitable for making large diameter valves. Pneumatic plastic PVC butterfly valves are not only widely used in oil, gas, chemical, water treatment and other general industries, but also used in cooling water systems of thermal power stations.