a.Metal sealing butterfly valve in the application of low temperature devices introduced

With the rapid development of industrial technology of the valve industry has more stringent requirements, particularly for low-temperature dielectric used in the butterfly valve, in addition to the general valve to meet the performance, it is more important is the state at low temperatures the reliability of the valve seal under the action of low-temperature flexibility, as well as some other special valve requirements. With the rapid development of industrial technology of the valve industry has more stringent requirements, particularly for low-temperature dielectric used in the butterfly, in addition to the general valve to meet the performance, it is more important is the state at low temperatures the reliability of the valve seal under the action of low-temperature flexibility, as well as some other special valve requirements.



As everyone knows, the butterfly valve has a compact structure, small size, light weight the same pressure, the same path of the valve compared to reduce 40% ~ 50%) of small fluid resistance, a series of advantages such as rapid headstock. However, in some low-temperature devices such as day of liquefied fuel equipment, air separation equipment, and pressure swing adsorption equipment used in the chemical industry more than 80% of the valve is shut-off valves, or valve, the use of a small number of butterfly valves. Analysis of its causes have been mainly in low-temperature metal sealed butterfly valve sealing performance under the adverse situation, and other unreasonable due to structural causes, such as medium leakage and leakage, severely affected the safety of these low-temperature equipment and the normal operation, can not meet the low-temperature equipment.



According to the continuous development of low temperature devices, the requirements of the valve on the low-temperature growing, to meet the needs of the development of a market economy, metal sealed butterfly valve on structural improvements in the development of a pure three-eccentric metal high sealing performance of Butterfly valve (Figure 1, has been declared national patent) is the high temperature regardless of medium or low temperature can meet their needs. Is combined with its structural characteristics, low temperature performance for only a brief introduction.

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