Butterfly valve is used to open and close the circular opening and closing pieces about 90 degrees to open, close and adjust the fluid channel of a valve. The butterfly valve not only has the advantages of simple structure, small size, light weight, material consumption, small installation size, small driving torque, simple and quick operation, but also good flow witnessing function and close-seal feature, One of the fastest growing valve varieties in years. Especially in the United States, Japan, Germany, France, Italy and other industrialized countries, the use of butterfly valves is very wide. Its varieties and quantities are still expanding, and to the high temperature, high pressure, large diameter, high sealing, long life, excellent regulation characteristics and a valve multi-function direction, its reliability and other performance indicators are higher Level, and has partially replaced the globe valve, gate valve and ball valve. With the progress of butterfly technology. In the foreseeable short period of time, especially in large and medium caliber, low pressure use, butterfly valve will become the leading form of the valve. The original butterfly valve is a simple, closed flap valve. It is usually used as a flow control valve and a damping valve in water piping systems. With the use of chemically resistant synthetic rubber on butterfly valves, butterfly valve performance is improved. As the synthetic rubber has the characteristics of corrosion resistance, erosion resistance, dimensional stability, good resilience, easy forming, low cost and the like, and can be selected according to different requirements of different performance synthetic rubber to meet the conditions of the use of butterfly valves, which Widely used in the manufacture of butterfly valve lining and flexible seat. Due to its high corrosion resistance, stable performance, easy aging, low coefficient of friction, ease of forming and dimensional stability, PTFE can also be improved in strength by filling and adding appropriate materials to improve its overall performance. Lower friction coefficient of the butterfly valve sealing material to overcome some of the limitations of synthetic rubber, and thus to PTFE as the representative of polymer materials and their filling modified materials in the butterfly valve has been widely used, so that the butterfly valve Performance has been further improved, there has been a wider range of temperature, pressure, sealing performance, longer life butterfly valve. To meet the high and low temperature, high erosion, long life and other industrial applications, the requirements of the past decade, the metal seal butterfly valve has been a great development. With the application of high temperature resistant, low temperature resistant, strong corrosion resistant, strong erosion resistant and high strength alloy material in butterfly valves, the metal sealed butterfly valves have been widely used in industrial fields such as high and low temperature, strong erosion and long life, The emergence of a large diameter (9750mm), high pressure (2.2kN / cm2), a wide temperature range (-102 ~ 606 ℃) of the butterfly valve so that the butterfly valve technology to a whole new level. The design and manufacture of butterfly valves have taken a whole new level due to the application of CAD and CAM and FMS in the valve industry. Not only to fully reform the valve design and calculation methods to reduce the professional and technical personnel heavy repetitive routine design work, so that technicians have more energy used to improve product performance and new product research and development, shorten the cycle and improve Labor productivity. Especially in the field of metal sealing butterfly valve, due to the application of CAD / CAM, there is a three-dimensional sealing pair which is designed by CAD and manufactured by cAM numerical control, so that the sealing surface of the valve does not have any squeezing, scratching and abrasion during opening and closing , So that the sealing of the butterfly valve and the life of an order of magnitude increase. Butterfly valves, when fully open, have a lower flow resistance and are capable of sensitive flow control when opened at between about 15 ° and 70 °, so the use of butterfly valves is very common in large caliper applications and will Gradually become the dominant valve type. Due to the wiping properties of the butterfly valve disc, most butterfly valves are available for media with suspended solids and can also be used in powdered and granular media depending on the strength of the seal. Butterfly valve classification Butterfly valve of many types, and there are a variety of classification methods. 1. Classified by structure (1) Central sealing butterfly valve (2) Single eccentric sealing butterfly valve (3) Double eccentric sealing butterfly valve (4) Three eccentric sealing butterfly valve 2. According to the sealing surface material classification (1) soft sealing butterfly valve 1) The sealing pair is made of non-metallic soft materials on non-metallic soft materials. 2) The sealing pair is made of metal hard material to non-metal soft material. (2) metal seal butterfly valve. The sealing pair is made of metal hard material to metal hard material. 3. Classified by the seal (1) mandatory seal butterfly valve. 1) Flexible sealing butterfly valve. Seal pressure than the valve plate is closed by the valve seat squeeze, seat or valve plate flexibility generated. 2) plus torque sealing butterfly valve. The seal pressure is generated by the torque applied to the valve shaft. (2) pressure sealing butterfly valve. Sealing pressure than the valve seat or valve plate by the elastic sealing element pressure generated. (3) automatic sealing butterfly valve. Sealing pressure is automatically generated by the media pressure. 4. Classified by working pressure (1) Vacuum butterfly valve. The working pressure is lower than the standard atmospheric pressure butterfly valve. (2) low pressure butterfly valve. Nominal pressure PN ≤ 1.6MPa butterfly valve. (3) medium pressure butterfly valve. Nominal pressure PN is 2.5 ∽ 6.4MPa butterfly valve. (4) high pressure butterfly valve. Nominal pressure PN is 10.0 ∽ 80. OMPa butterfly valve. (5) Ultra-high pressure butterfly valve. Nominal pressure PN> 100MPa butterfly valve. Butterfly valve Description: Butterfly valve opening and closing pieces is a disc-shaped disc, the valve body around its own axis of rotation, so as to achieve opening and closing or regulating valve called butterfly valve. The butterfly valve fully open to the whole is usually less than 90 degrees, the butterfly valve and the butterfly rod itself is not self-locking force, in order to disc positioning, to install a worm reducer on the stem. The use of worm reducer, not only can make the disc self-locking ability to stop the butterfly plate in any position, but also to improve valve performance. Industrial butterfly valve features high temperature, high pressure range, the valve nominal diameter, the valve body made of carbon steel, the valve ring using a metal ring instead of rubber ring. Large high temperature butterfly valve welded steel manufacturing, mainly for high temperature medium smoke duct and gas pipelines. The advantages of butterfly valves are as follows: 1. Opening and closing fast and easy, labor-saving, fluid resistance is small, you can often operate. 2. Simple structure, small size, light weight. 3. Can transport mud, liquid storage in the mouth of pipe at least. 4. Low pressure, can achieve a good seal. 5. Regulate the performance. The shortcomings of the butterfly valve are as follows: 1. The working pressure and working temperature range is small. 2, poor sealing. Butterfly valve can be divided according to the structure of the bias plate, vertical plate, inclined plate and lever. According to the sealing form can be divided into more sealed and hard seal two. Rubber seals are generally used rubber ring seal, hard seal is usually used metal ring seal. According to the connection type can be divided into flange connection and the clamp connection; According to the transmission can be divided into manual, gear transmission, pneumatic, hydraulic and electric several. Butterfly valve installation and maintenance should note the following: 1. During installation, the valve should be stopped in the closed position. 2. Open position should be determined by the rotation angle of the disc. 3. Butterfly valve with bypass valve should open bypass valve before opening. 4. Should be installed according to the manufacturer's installation instructions, heavy butterfly valve, should be set up a solid foundation.
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