Butterfly valve is closed parts (valve flap or disc) for the disc, around the valve axis to achieve the opening and closing a valve, cut off from the main pipe and throttle use. Valve opening and closing piece is a disc-shaped disc, the valve body around its own axis of rotation, or adjustments to achieve the purpose of opening and closing. Valve fully open to fully closed is usually less than 90 °, and the butterfly valve lever itself is not self-locking capability, in order to position disc to install on worm gear reducer in the stem. The use of worm gear reducer, not only can make the butterfly plate with self-locking capability, so that disc to stop at any position, but also to improve the operational performance of the valve.
Industry-specific features to high temperature valve for higher pressure range, the valve nominal diameter large, carbon steel valve body, valve plate metal ring instead of the rubber seal ring. Large butterfly valve with steel plate welded high-temperature manufacturing, mainly for high-temperature medium duct smoke and gas pipelines.

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