The original butterfly valve is a simple, and off-tight bezel valve. It is usually used as a flow regulator valve and damping valve in the plumbing system. With the application of chemical-resistant synthetic rubber on butterfly valve, the performance of butterfly valve can be improved.
Because synthetic rubber has corrosion resistance, erosion resistance, dimensional stability, good resilience, easy forming, low cost and other characteristics, and according to different use requirements to choose different performance of synthetic rubber, in order to meet the use of butterfly valve conditions, so it is widely used in the manufacture of butterfly valve lining and elastic seat. Because PTFE (PTFE) has strong corrosion resistance, stable performance, not easy aging, low coefficient of friction, easy forming, dimensional stability, and can also be filled, add appropriate materials to improve its comprehensive performance, get better strength, lower friction coefficient of butterfly valve sealing material, overcome some of the limitations of synthetic rubber, Therefore, the polymer polymerization material represented by PTFE and its filler modified material have been widely used in butterfly valve, so that the performance of butterfly valve has been further improved, resulting in a wider temperature, pressure range, sealing performance, longer service life butterfly valve. In order to meet the requirements of high and low temperature, strong erosion, long life and other industrial applications, metal sealed butterfly valves have been greatly developed in the past more than 10 years. With high temperature resistance, low temperature resistance, strong corrosion resistance, strong erosion resistance, high-strength alloy materials in the butterfly valve application, so that metal seal butterfly valve in high and low temperature, strong erosion, long life and other industrial fields have been widely used, the emergence of large caliber (9750mm), high pressure (2.2kn/cm2), wide temperature range (-102~606℃) butterfly valve, so that the butterfly valve technology to reach a new level.
Because the motion of butterfly valve plate is wiping, most butterfly valves can be used in media with suspended solid particles, depending on the strength of the seals can also be used for powdery and granular media. Butterfly valve is a kind of valve which uses disc opening and closing parts to turn around 90 degrees to open, close and adjust the fluid channel. Butterfly valve Not only simple structure, small size, light weight, material consumption, small installation size, and small driving torque, simple and rapid operation, and can also have good flow apoptosis function and close sealing characteristics, is one of the rapid development of valve varieties in the past more than 10 years. Especially in the United States, Japan, Germany, France, Italy and other industrially developed areas, butterfly valve use is very extensive. Its use of varieties and quantities continue to expand, and to high temperature, high pressure, large caliber, high sealing, long life, excellent adjustment characteristics and a valve multi-functional direction of development, its reliability and other performance indicators are high level, and has partially replaced the globe valve, gate valve and ball valve. With the progress of butterfly valve technology. Butterfly valves will become the dominant valve form in the foreseeable short period of time, especially in the field of large and medium-sized caliber, medium and low pressure use.
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