Functional use of butterfly valves

The butterfly valve is usually less than 90° from fully open to fully closed. The butterfly valve and butterfly rod have no self-locking ability. In order to position the butterfly plate, a worm gear reducer should be installed on the valve rod. The use of the worm gear reducer not only enables the butterfly plate to have self-locking ability, making the butterfly plate stop at any position, but also improves the operating performance of the valve. The characteristics of the industrial special butterfly valve: high temperature resistance, a high applicable pressure range, a large nominal diameter of the valve, the valve body being made of carbon steel, and the sealing ring of the valve plate being made of a metal ring instead of a rubber ring. Large-scale high-temperature butterfly valves are manufactured by welding steel plates and are mainly used for flue gas ducts and gas pipelines for high-temperature media.