Butterfly valve refers to the closing parts (disc or disc) for the disk, the rotation around the valve shaft to achieve the opening and closing of a valve, in the pipeline mainly cut off and throttling. Butterfly valve is a disc - shaped disc, in the body around its own axis rotation, so as to achieve the purpose of opening and closing or adjustment.

Butterfly valve full open to full close is usually less than 90°, butterfly valve and butterfly rod itself do not have self-locking ability, in order to butterfly plate positioning, to install worm gear reducer on the valve stem. Using worm gear reducer, not only can make the butterfly plate has the self-locking ability, make the butterfly plate stop at any position, but also can improve the operating performance of the valve.

Industrial special electric butterfly valve features high temperature resistance, pressure range is also higher, the valve nominal diameter is large, the body is made of carbon steel, the valve plate seal ring USES metal ring instead of rubber ring. Large high temperature butterfly valve is made by welding steel plate, which is mainly used for smoke duct and gas pipeline of high temperature medium.