The pneumatic ball valve is in the process of switching movement. The compression degree of the sealing material at the bottom of the valve seat will change, and some parts will leak due to the infiltration of media, which will seriously affect the normal operation of the valve for a long time and cause premature damage to the sealing structure of the valve seat and its bottom. Due to the large number of leakage points, the service life of valves is generally short, which usually cannot meet the user's requirements, and the pneumatic ball valve can only be replaced frequently to maintain the operation of the system.

① The flow regulator (flow rectifier) is a pipe fitting consisting of a perforated plate placed in the pipe or a smaller tube bundle (or grid plate), which is used to reduce (or eliminate) vortices and improve the distortion of velocity distribution, so as to shorten the length of straight pipe section.