under the condition of the following conditions, recommend choosing butterfly valve: (1) for throttling and adjusting control flow; (2) slurry medium and medium containing solid particles; (3) requiring shorter valve structure; (4) for opening and closing speed occasions; (5) the differential smaller places.

in two position adjustment, reducing channel, low noise, have spirit of hole and vaporization phenomenon, into the atmosphere of a small amount of leakage, wear and tear 'medium, can choose butterfly valve.

under the condition of the special working condition of throttling or seal strict, or wear, low temperature, Cryogenic) Using a butterfly valve, such as operating conditions need to use special design of triple eccentric metal sealing with conditioning or double eccentric special butterfly valve.

in the early years of butterfly valve widely used natural rubber seat tightness, although there is a very excellent sealing performance, but suitable for low temperature and pressure, generally at about 70 ℃, no greater than PN10. Then the emergence of synthetic rubber and applied on the butterfly valve, make the suitable temperature to 120 ℃ or so, apply pressure also increase accordingly to the PN16. Especially the corrosion wear resistance performance has improved greatly, until today, has been widely used in water supply and drainage industry. With the rapid development of chemical industry, the emergence of fluorine plastic, make the performance of the butterfly valve had further improved, using PTFE material manufacturing butterfly Industrial Valves seat, make the application of the butterfly valve temperature increased to 180 ℃, apply pressure has increased greatly, and the ability to strong acid, strong alkali corrosion and chemical solvents.

the use of metal sealing material and triple eccentric structure design, resulted in a revolutionary change in the butterfly valve. The past resistance to high pressure, high temperature resistant of butterfly valve is the key to the weak links. Butterfly valve sealing material is natural rubber, synthetic rubber, fluorine plastic and other materials, and can withstand the temperature and pressure is limited.

due to the metal rigid sealing ring, metal expansion seal metal elastic sealing ring, multi-layer stainless steel/graphite composite circle in the application of the butterfly Industrial Valves with eccentric butterfly plate structure, its edge as spherical and conical form and to match the metal elastic ring, tight seal, so that the application of the butterfly valve pressure to PN63 above, applicable temperature as high as 600 ℃. Its superior performance has been steam, gas, hot air and corrosive medium in areas such as widely used.

butterfly valve according to structure form, the kinds of butterfly valve can be divided into the following types:

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