Failure cause analysis and countermeasures of high-temperature pneumatic ball valve for coking; high-temperature pneumatic ball valve is generally used at a temperature of about 500 ℃. Metal hard sealing is also used to prevent leakage caused by uneven pressure on the valve seat due to instability of the bellows, so steam is injected into the inner and outer cavities of the bellows for purging. Widely used in domestic delayed coking units with high temperature on coke tower bottom residual oil pipeline and tower top oil steam pipeline. The high-temperature pneumatic ball valve has broken through the limit of the use temperature of the soft seal pneumatic ball valve, and its structure is more complex. Its manufacturing process and parts selection are also more sophisticated. The problems of the pneumatic ball valve during the operation of the coking unit should be timely checked online and properly handled. Correct inspection and use methods are particularly important.

Advantages of rotary spherical compensator:
The rotary spherical compensation has large compensation ability, small fluid resistance and deformation stress of the rotary compensator, no blind plate force and small force on the fixed support.
At the same time, the advanced technology of filling installation is added to the equipment, which makes the sealing performance of the equipment more stable and reliable. Even if leakage occurs during long-time operation, it can be maintained without stopping gas and reducing pressure, and it is very convenient and fast. In particular, it has obvious economic and social benefits for the escort of remote thermal insulation energy.
Use of rotary spherical compensator:
1. It is used in thermal pipelines to compensate for thermal shrinkage, and its compensation ability is 5-10 times of that of the compensator.
2. It is used as a universal joint in the vaporization cooling system of metallurgical equipment (such as blast furnace, converter, electric furnace, heating furnace, etc.).
3. It is used in various pipelines of buildings to avoid damage to pipelines due to unpredictable reasons such as uneven settlement of foundation or vibration.