Valve opening and closing is a disc-shaped pieces of the disc, the valve body around its own axis of rotation, or adjustments to achieve the opening and closing the valve called the Butterfly valve. Valve fully open to fully closed is usually less than 90 degrees, Butterfly valve and Butterfly valve stroke does not have a strong self-locking, in order to position the disc to install the valve stem on the worm gear reducer. With worm reducer, not only can make the disc with self-locking capability, so that the disc stops at any position, but also to improve the operational performance of the valve. Industry-specific characteristics of Butterfly valve valves to high temperature, for higher pressure range, the valve nominal diameter of large, carbon steel valve body, valve plate rubber seal with metal ring instead of ring. Large-scale manufacture of high temperature valve welded with steel plate, the main medium for high-temperature air duct smoke and gas pipelines.

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