Particularly in the butterfly valve in the use of low-temperature medium, in addition to meet the normal condition with the general performance of the valve and, more importantly, at low temperature valve sealing reliability, flexibility and low temperature operation of some other special valve requirements.
Because the valve has a compact, small size, light weight (with the same pressure, compared with the same diameter of the valve can reduce 40% ~ 50%), fluid resistance small, open and close rapidly and a series of advantages, it is widely used .
But our country in some low-temperature devices, such as days of fuel liquefaction, pressure swing adsorption air separation equipment, and equipment used in the chemical industry, 80% of the valve or valve or gate valve, butterfly valve using a small number. The main reason is the low temperature metal seal butterfly valve sealing performance under adverse conditions, and other irrational structure caused by medium leakage and leakage phenomenon, severely affected the safety of these low-temperature devices and normal operation can not meet cryogenic equipment
According to the continuous development of low temperature devices, the requirements of the growing low-temperature valve, so the metal sealing butterfly valve for structural improvements, development of pure metal high three eccentric butterfly valve sealing performance, this butterfly is whether the medium is high or low temperatures can meet their needs. Is combined with its structural characteristics, low temperature performance for only a brief introduction.

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