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Expansion butterfly valve is a kind of soft sealing butterfly valve. The butterfly plate is installed in the diameter direction of the pipe. In the butterfly valve body cylindrical channel, disc disc around the axis of rotation, rotation angle of 0 ° ~ 90 ° , rotation to 90 ° , the valve card is fully open. Butterfly valves should generally be installed horizontally in pipelines. Butterfly valve can be divided into flange-type soft sealing butterfly valve, clip-type soft sealing butterfly valve, welding-type soft sealing butterfly valve.