Design And Research Of Cryogenic Three Eccentric Hard Seal Butterfly Valve

Special valve for large scale ASU has the characteristics of strongly professional and difficulty manufacturing. With developing of the large scale ASU, the diameter of the special valve also becomes more and more bigger. Further, due to the large scale ASU gradually tend to use internal compression process, the pressure rating of the gas products increased, so it makes a requirement of from low pressure to high pressure for special valves.Developing the cryogenic three eccentric hard seal butterfly vale have an important meaning, which can increase the step of domestic large scale ASU, and also improve the core technology and competitiveness, meanwhile, the air separation technology is promoted.Based on the theoretical study of the cryogenic three eccentric hard seal butterfly valve, this paper analyzes the structure of the three eccentric butterfly valve, then figure out the equation of the seal face contour lines, and analyze the angle which is made up by the section long axis and the element of cone, after that the functional relations between these three eccentrics can be deduced out. Finally a fast verification program for the three eccentric valve is built up.Making a frock clamp through a research of the cryogenic material and the processing technic of the three eccentric valve.Analyze the three eccentric valve with mechanics, combine with shaft torque study, the valve can be modeled and simulated.A cryogenic three eccentric butterfly valve is test manufactured which is complied with the design requirements by the pressure testing. According to the actual working situation, the valve performance completely meets the working condition.It is easy to make the derivative design by this research towards different diameter, different pressure and so on.