Conclusion Due to the particularity of coking unit process, the high-temperature pneumatic ball valve used in the unit should be regularly maintained and overhauled during the operation of the unit. In general, a comprehensive maintenance and overhaul shall be carried out for the valve in one cycle of coking unit operation to avoid the shutdown of the unit due to valve failure in the next operation cycle. Based on years of valve manufacturing experience, this paper analyzes the faults of this kind of high-temperature pneumatic ball valve in use, and carries out relevant maintenance work, which solves the practical problems for the refinery and achieves good results.

Which gases and liquids can be guaranteed by stainless steel pneumatic butterfly valve
The stainless steel pneumatic butterfly valve is a flexible element that is made of stainless steel bellows with one or more layers of steel wire or steel belt mesh sleeves, and is equipped with joints or flange heads at both ends to escort various media. 2、 Features: corrosion resistance, high temperature resistance, low temperature resistance (- 196 ℃~+420 ℃), light weight, small size, good flexibility. It is widely used in aviation, aerospace, petroleum, chemical industry, metallurgy, power, paper making, wood, textile, construction, medicine, food, tobacco, transportation and other industries.
1. Recommend high-temperature media such as high-temperature gas and hot oil. (e.g. hot steam, heat transfer oil, etc.) 2 Escort cryogenic or ultra-low temperature media. (e.g. liquid nitrogen)
3. Recommend corrosive chemical media or organic solvents. (For example: loading and unloading ammonia, acetone, etc.) 4 Water, steam, oil and other media are recommended under high temperature environment. (e.g. water steam system and hydraulic system in coking, steelmaking and continuous casting equipment) 5 Pipeline requiring shock absorption or noise elimination
Stainless steel bellows (stainless steel pneumatic butterfly valve) is a high-quality flexible pipeline in modern industrial pipelines. The product is mainly composed of corrugated pipe, mesh sleeve and joint or flange. The inner tube of the product is a spiral or annular thin-walled stainless steel corrugated tube, and the net sleeve of the outer layer of the corrugated tube is woven by stainless steel wires according to certain parameters.