In the process of selecting the soft-sealed butterfly valve, we must pay attention to the problem of direction, that is, the soft-sealed butterfly valve is in the diameter direction of the pipeline, in the cylindrical passage of the valve body, the disc-shaped disc will rotate around the axis, and its rotation angle It must be between 0° and 90°, so that it can be rotated to 90° when in use. When it is rotated to 90°, the valve will be in a fully open state.
The soft sealing butterfly valve is simple in structure, small in size and light in weight, and consists of only a few parts. When the soft sealing 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 better flow control characteristics. The soft sealing butterfly valve has two sealing types: elastic sealing and metal sealing. 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 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.
The soft-sealed butterfly valves we generally use will have two types: wafer type and flange type. If the 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 the soft sealing butterfly valve is especially suitable for making large-diameter valves. Soft sealing butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, water treatment, etc., but also used in cooling water systems of thermal power stations.
