1 Scheme for machining the inner surface of pneumatic ball valve shell The inner surface of shell parts can be machined by turning, milling, grinding and other methods. In order to process the shell of the pneumatic ball valve shown in Figure 1, the two inner surfaces of the ball were milled separately with a forming milling cutter before, but the machining accuracy failed to meet the requirements. Therefore, the processing of this part is listed as a scientific research topic in the university.)

2. Installation process of pneumatic ball valve
(1) Install the valve into the pipeline. The valve for handle drive can be installed at any position on the pipeline. However, the manual pneumatic ball valve with gearbox and the pneumatic pneumatic ball valve with pneumatic driver are installed vertically, that is, they are installed on the horizontal pipeline, and the driving device is above the pipeline.
(2) The sealing gasket shall be installed on the connecting pipe shoe between the valve flange and the pipeline flange according to the design requirements.
(3) The bolts on the flange shall be symmetrically tightened one by one and evenly.
(4) Pneumatic actuators are used to connect pneumatic pipelines.