Through the analysis of the sectional drawing of the pneumatic ball valve shell, the most ideal method for machining the inner surface of the part is turning. Because it is difficult to ensure the dimensional accuracy and surface quality of spherical surface by manual turning with ordinary lathe, it is difficult to achieve good surface contact when matching with other parts, so CNC turning must be adopted to ensure the processing accuracy. Since the inner surface of the valve body is approximately a closed sphere, it is inconvenient for the tool to enter and exit during machining. If the ordinary wok cutter is used for processing, it is difficult to ensure its rigidity because the overhang length of the cutter bar exceeds 75mm. Therefore, reasonable tool design is the key step to realize machining.

The pneumatic ball valve is mainly driven by the power supply to complete the opening and closing and adjustment of the valve. Pneumatic ball valves are widely used in a variety of industrial fields, mainly for cutting off or connecting the medium in the pipeline, and also for fluid regulation and control. Pneumatic ball valve is a kind of pipeline pressure element for industrial automation process control. Due to the particularity of the pneumatic ball valve, the actuator of the pneumatic valve is easy to damage the motor or other parts due to the environment and internal reasons of the valve pipeline, which will affect the service life of the pneumatic ball valve. Therefore, proper and correct maintenance can effectively extend the service life of the pneumatic ball valve, improve the work efficiency, reduce the downtime, and save the replacement cost.