The original butterfly valve is a simple and loosely closed flapper valve. It is usually used as a flow regulating valve and a damping valve in water pipeline system. With the application of chemical resistant synthetic rubber in butterfly valve, the performance of butterfly valve can be improved. Synthetic rubber is widely used to make lining and elastic seat of butterfly valve because of its corrosion resistance, erosion resistance, stable size, good resilience, easy forming, low cost, etc. and it can choose different performance synthetic rubber according to different use requirements to meet the operating conditions of butterfly valve.

As polytetrafluoroethylene (PTFE) has strong corrosion resistance, stable performance, not easy to aging, low friction coefficient, easy to form, and stable size, and it can also be filled and added with appropriate materials to improve its comprehensive performance to obtain butterfly valve sealing materials with better strength and lower friction coefficient, which overcomes some limitations of synthetic rubber. Therefore, polytetrafluoroethylene is the representative of high score The subpolymerization material and its filling modified material have been widely used in butterfly valve, so that the performance of butterfly valve has been further improved. In order to meet the requirements of high and low temperature, strong erosion, long life and other industrial applications, the metal sealed butterfly valve has been greatly developed in the past decade. 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 sealed butterfly valves have been widely used in high and low temperature, strong erosion resistance, long life and other industrial fields. Large diameter (9750mm), high pressure (2.2kn / cm2), wide temperature range (- 102-606 ℃) butterfly valves have emerged, which makes the technology of butterfly valves reach a new water Ping.

Because the movement of the valve plate of the butterfly valve has the wiping property, most of the butterfly valves can be used for the medium with suspended solid particles, and can also be used for the powder and granular medium according to the strength of the seal.

Butterfly valve is a kind of valve which uses the disc type opening and closing parts to rotate about 90 degrees to open, close and adjust the fluid channel. 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 throttling function and closing sealing characteristics. It is one of the fastest-growing valve varieties in recent ten years. Especially in the United States, Japan, Germany, France, Italy and other industrial developed countries, the use of butterfly valve is very extensive. Its variety and quantity are still expanding, and to high temperature, high pressure, large diameter, high sealing, long life, excellent regulation characteristics and one valve multi-functional direction, its reliability and other performance indicators are up to a high level, and has partially replaced the stop valve and gate Valves and ball valves. With the development of butterfly valve technology. In the foreseeable short time, especially in the field of large and medium caliber, medium and low pressure, butterfly valve will become the leading valve form.

Because of the application of CAD, cam and FMS in valve industry, the design and manufacture of butterfly valve has reached a new level. It not only completely innovates the design calculation method of the valve, reduces the heavy repetitive conventional design work of the professional and technical personnel, makes the technical personnel have more energy to improve the technical performance of the product and the research and development of the new product, shortens the cycle and improves the labor productivity. Especially in the field of metal sealed butterfly valve, due to the application of CAD / CAM, there are three-dimensional sealing pairs designed by CAD and manufactured by cam numerical control, which make the sealing surface of the valve free from any extrusion, scratch and wear during the opening and closing process, thus improving the tightness and service life of the butterfly valve by an order of magnitude.