If the high-temperature electric pneumatic ball valve driven by the power supply has coking condition in the valve when the torque of the valve driving device is insufficient, the failure cause analysis and countermeasures of the high-temperature pneumatic ball valve for coking and the abnormal shaking of the actuator during the valve operation, and the shaking is increasing with the operation of the device, it indicates that the coking in the valve has been serious. At this time, remove the valve for maintenance. When disassembling and maintaining the high-temperature pneumatic ball valve that has not been difficult to operate, it focuses on cleaning the internal coking of the valve, especially the parts between the bellows and the bottom of the ball and the valve body, as well as the sealing surface. Sometimes a thin layer of hard coke is formed on the spherical surface of the sphere. For cleaning this part of coke, a special soft metal scraper should be used to remove it. The coking in the corrosion pit shall be removed by a similar method, and then the corresponding materials shall be selected for repair welding and grinding. For valves with abnormal conditions, after cleaning and coking, the valves shall be comprehensively inspected, and then targeted inspection shall be carried out for the abnormal conditions. Because the flow medium contains sulfur, the corrosion of the valve sealing surface is inevitable, that is, the repair of the valve sealing surface is essential. The damage of sealing surface mainly includes corrosion, abrasion or scratch. For corrosion, corrosion pits can be generally solved by grinding. For local wear, slight wear can be solved by grinding. If the wear is serious, local repair welding is required. Then grind. For scratches, repair welding is required for the scratched parts, then machining and finally grinding; If the repair welding area is large or the depth is deep, the part shall be calibrated before machining. For the maintenance of bellows, once there is coking at the bellows, it is difficult to separate the bellows from its guide cylinder, so it needs to be disassembled with special tools with its waveform. If there is coking at the bellows, the distribution of the coking block on the bellows is usually uneven, and the bellows may have been deformed (the two ends of the bellows are not parallel, and the same wave has deviation in different phase wave distance), so it is necessary to level its two ends, and adjust the wave distance appropriately to maintain the rigidity of the bellows.

Heat carrier oil, also known as heat transfer oil, heat transfer oil, is a kind of heat transfer medium. Because of its characteristics of average heating, accurate temperature regulation and control, high temperature at low steam pressure, good heat transfer effect, energy conservation and easy operation, heat carrier oil has been widely used in various places this year, and its use and consumption are increasing in inspection of heat carrier oil system