The butterfly plate of the vacuum butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When it rotates to 90°, the valve is fully opened. It is simple in structure, small in size and light in weight, and consists of only a few parts.
Moreover, it can be opened and closed quickly by rotating 90°, and the operation is simple. At the same time, the valve has good fluid control characteristics. When it is in the open position, the thickness of the butterfly plate is the resistance when the medium flows through the valve body, so the pressure drop produced by the valve is small, so it has better flow control characteristics.
It has two sealing types: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be inlaid on 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 seal them.
The metal seal can adapt to higher working temperature, while the elastic seal has the defect of being limited by temperature.
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