Telescopic butterfly valve as a system used to achieve the pipeline system on-off and flow control components, has been in the petroleum, chemical, metallurgical, hydropower and many other fields have been very widely used. Retractable butterfly valve disc installed in the pipe diameter direction. In the butterfly valve body cylindrical channel, the disc-shaped disc rotates around the axis, the rotation angle is between 0 ° ~ 90 °, when rotated to 90 °, the self-acting valve is fully open state. This valve is normally installed horizontally.
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