Technical characteristics of pneumatic butterfly valves

In recent years, with the development of modern industry, the use of butterfly valves has expanded from low-pressure water supply to media with temperatures as high as 538°C and as low as -184°C. The pressure has also increased from low to high, and they are now widely used in air separation, chemical, metallurgy, and sewage treatment fields. Moreover, the valve diameters are becoming larger, performance requirements are higher, and the expected service life is longer. Currently, most butterfly valves produced domestically and internationally use rubber seals and plastic seals, which are prone to wear and aging, and cannot meet the continuous operation cycle of equipment. Taking air separation as an example, today's air separation equipment mainly based on cryogenic separation principles uses a molecular sieve pre-purification process. The working pressure is 0.5~0.9 MPa, and the medium temperature range is 10~200°C. The switching valves experience large temperature differences, have large diameters, switch frequently, and the rubber seals of the valves are prone to wear and aging. Additionally, replacing them is also relatively difficult.