The butterfly plate is driven by the valve stem, and if it is turned 90°, it can complete a opening and closing. By changing the deflection angle of the butterfly, the flow rate of the medium can be controlled.

Working conditions and medium: Butterfly valve is suitable for transporting various corrosive and non-corrosive fluid media in engineering systems such as furnaces, coal gas, natural gas, liquefied petroleum gas, city gas, hot and cold air, chemical smelting and power generation environmental protection, building water supply and drainage, etc., and is used to regulate and cut off the flow of media.

Butterfly valve is a kind of valve that uses a disc opening and closing part to reciprocate about 90° to open, close or adjust the flow rate of the medium. The butterfly valve not only has simple structure, small size, light weight, low material consumption, small installation size, small driving torque, simple and fast operation, but also has good flow regulation function and closing sealing characteristics, which is one of the fastest developing valve varieties in recent ten years. Butterfly valves are widely used. The variety and quantity of its use continue to expand, and develop to high temperature, high pressure, large diameter, high tightness, long life, excellent regulation characteristics, and multi-function of one valve. Its reliability and other performance indicators have reached a high level.

With the application of chemically resistant synthetic rubber to butterfly valves, the performance of butterfly valves has been improved. Because synthetic rubber has the characteristics of corrosion resistance, erosion resistance, dimensional stability, good resilience, easy forming, low cost, etc., synthetic rubber with different properties can be selected according to different use requirements to meet the working conditions of butterfly valves.