Butterfly valve with disc type opening and closing a reciprocating swing around 90 ° to open and close a medium flow valve or mediation. Butterfly valve is not only simple structure, small volume, light weight, material consumption province, small installation size, driving moment, simple operation, rapid, and can also have a good flow regulating function at the same time and close the seal characteristics, is the most rapid development in last decade of one of the valves varieties. Butterfly valve has a very wide range of use. The number of varieties and its use continues to expand, and to high temperature and high pressure, large diameter, high sealing, long service life, good features, the regulation of multi-purpose development and a valve. Its reliability and other performance indexes reach a higher level.

As the chemical corrosion resistant synthetic rubber in the application of butterfly valve, butterfly valve performance is improved. Because the synthetic rubber has anti corrosion resistance, erosion resistance, dimension stability, and good resilience, easy molding, low cost, etc, and can choose according to the different requirements of different performance synthetic rubber, in order to meet the working conditions of the use of butterfly valve.

Because the ptfe has strong corrosion resistance, stable performance, not easy to aging, low friction coefficient, easy to shape, size stability, and can be filled, add the appropriate materials to improve the comprehensive performance, get better strength, lower friction coefficient of the butterfly valve sealing materials, overcome the limitations of the synthetic rubber, thus represented by ptfe modified materials, polymer material and filling on the butterfly valve has been widely used, so that the performance of the butterfly valve has been further improved, making the temperature and pressure is wider, reliable sealing performance, longer service life of butterfly valve.

In order to meet the high and low temperature, strong erosion, long-life industrial applications such as the use of the requirements, the metal sealing butterfly valve has been great development. With high temperature resistant, resistant to low temperature, strong corrosion resistance, strong corrosion resistance, high strength alloy material in the application of the butterfly valve sealing butterfly valve as soon as possible in high and low temperature, strong erosion, long life and other industrial fields has been widely used, a large diameter, high pressure, wide temperature range of butterfly valves, so that the butterfly valve technology to a whole new level.

Butterfly valve in the fully open, has small flow resistance. When open between 15 ~ 70 °, and can perform a sensitive flow control, thus in the field, the regulation of large diameter butterfly valve application is widespread.

As a result of the butterfly valve disc movement with polished, so most of the butterfly valve can be used to bring suspended solid particles of the medium. Based on the strength of the seal, also can be used for powder and granular media.

Butterfly valve is suitable for the flow control, such as pneumatic external regulation butterfly valve. Because of the butterfly valve in the pipe pressure loss is bigger, about three times the gate valve, so when choosing butterfly valve, pipe system is affected by pressure loss should be considered, also should consider closing disc version of the strength of the pipeline medium under pressure. In addition, you must consider resilient seat materials at high temperature on the operating temperature limit.

Butterfly valve structure length and the overall height smaller, opening and closing speed faster, and has good flow control characteristics. The structure and principles of butterfly valve is most suitable for the production of large diameter valves. When required to do butterfly valve control flow using one of the most important is the right choice of butterfly valve specifications and types, and making it work properly and effectively. Usually, in throttling and adjusting control and mud medium, demand structure length is short, the opening and closing speed, low dielectric, recommend choosing butterfly valve.

In two position adjustment, reducing pipe, low noise, have spirit point and evaporation phenomena, into the atmosphere of a small amount of leakage, with abrasive medium, the selection of butterfly valve.

Throttling under special working conditions, or seal strict, serious wear and tear, low temperature using a butterfly valve, such as operating conditions require special design of triple eccentric metal sealing bag conditioning or special double eccentric butterfly valve.

Center line butterfly valve is suitable for the requirements to completely sealed, gas leakage test temperature is zero, the demand is higher, work life in - 10-150 ℃ of fresh water, sewage, sea water, salt water, steam, natural gas, food, medicine, oil, and all kinds of acid and alkali, and other media on the pipeline.

Soft seal eccentric butterfly valve is suitable for the ventilation and dust removal pipe two-way opening and closing and adjustment, it is widely used in metallurgy, light industry, electric power, petrochemical industry system of gas pipeline and the water.