Butterfly valve is a kind of Dalian marine valve that uses disk type headstock gear to turn back and forth about 90 ° to open, close or regulate the medium flow. Butterfly valve is not only simple in structure, small in volume, light in weight, low in material consumption, small in installation size, small in driving torque, simple and rapid in operation, but also has good flow regulation function and closing sealing characteristics. It is one of the valve varieties that have developed rapidly in the past decade. Butterfly valves are widely used. The variety and quantity of its use are still expanding, and it is developing towards high temperature, high pressure, large diameter, high sealing performance, long life, excellent regulation characteristics and multi-function of one valve. Its reliability and other performance indexes have reached a high level.

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

Because polytetrafluoroethylene (PTFE) has strong corrosion resistance, stable performance, not easy to aging, low friction coefficient, easy to form, and stable size, and can improve its comprehensive performance by filling and adding appropriate materials to obtain butterfly valve sealing materials with better strength and lower friction coefficient, which overcomes the limitations of synthetic rubber, It has been widely used in butterfly valves, so that the performance of butterfly valves has been further improved, and butterfly valves with wider temperature and pressure range, reliable sealing performance and longer service life have been manufactured.