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.

In order to reduce the operating torque of the pneumatic ball valve and increase the reliability of the seal, an oil sealed ball valve has emerged. It not only injects special lubricating oil between the sealing surfaces to form an oil film, which not only enhances the sealing performance, but also reduces the operating torque, and is more suitable for high-pressure large caliber ball valves.