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According to the continuous development of cryogenic devices in China, the requirements for cryogenic valves are increasing day by day. Therefore, the structure of metal sealed butterfly valves has been improved, and a triple eccentric pure metal butterfly valve with high sealing performance has been developed. This butterfly valve can meet its needs regardless of whether the medium is high temperature or low temperature. In combination with its structural characteristics, the low-temperature performance is briefly introduced.
1、 Requirements for sealing performance of cryogenic butterfly valve: there are two main reasons for leakage of cryogenic valve, one is internal leakage; The second is external leakage. 1) The internal leakage of the valve is mainly caused by the deformation of the sealing pair at low temperature. When the medium temperature drops to make the material phase change, the volume changes, which causes the warping deformation of the sealing surface of the sludge valve with high grinding accuracy, resulting in poor sealing at low temperature. We once conducted a low-temperature test on DN250 valve. The medium was liquid nitrogen (- 196 ℃). The butterfly plate material was 1Cr18Ni9Ti (without low-temperature treatment). It was found that the warping deformation of the sealing surface was about 0.12mm, which was the main reason for internal leakage. The newly developed butterfly valve is changed from a plane seal to a cone seal.