The butterfly valve is a valve that uses a disc type opening and closing member to reciprocate about 90° to open, close or adjust the flow of the medium. The butterfly valve is not only simple in structure, small in size, light in weight, low in material consumption, small in installation size, small in driving torque, easy to operate and fast, and also has good flow regulating function and closed sealing characteristics. It has been developed in the past ten years. One of the fastest valve varieties. Butterfly valves are used in a wide range of applications. The variety and quantity used are still expanding, and the development of high temperature, high pressure, large diameter, high sealing, long life, excellent regulation characteristics, and one valve multifunction. Its reliability and other performance indicators have reached a high level.
With the application of chemically resistant synthetic rubber on butterfly valves, the performance of butterfly valves is improved. Because synthetic rubber has the characteristics of corrosion resistance, erosion resistance, dimensional stability, good resilience, easy forming, low cost, etc., and different performance synthetic rubbers can be selected according to different use requirements to meet the working conditions of butterfly valves.
Because polytetrafluoroethylene (PTFE) has strong corrosion resistance, stable performance, is not easy to age, has low friction coefficient, is easy to form, and is dimensionally stable, and can improve its comprehensive performance by filling and adding appropriate materials to obtain better strength and friction. The butterfly valve sealing material with lower coefficient overcomes the limitation of synthetic rubber. Therefore, the polymer polymer material represented by polytetrafluoroethylene and its filling modified material have been widely used in butterfly valves to improve the performance of butterfly valves. Further improvement has been made to produce a butterfly valve with a wider temperature range, a wider pressure range, a reliable sealing performance and a longer service life.
In order to meet the requirements of industrial applications such as high and low temperature, strong erosion, long life, metal sealing butterfly valves have been greatly developed. With the application of high temperature resistance, low temperature resistance, strong corrosion resistance, strong erosion resistance and high strength alloy materials in butterfly valves, metal sealing butterfly valves have been widely used in industrial fields such as high and low temperature, strong erosion and long life. Butterfly valves with large diameter (9~750mm), high pressure (42.0MPa) and wide temperature range (-196~606°C) have emerged, which has brought the butterfly valve technology to a new level.