The opening and closing parts of the air source ball valve are a ball, which rotates 90 degrees around the centerline of the valve body to achieve opening and closing. Ball valves are mainly used in pipelines to cut off, regulate, and change the flow direction of the medium. The gas source ball valve not only has a simple structure and good sealing performance, but also has small volume, light weight, low material consumption, small installation size, small driving torque, simple operation, and easy to achieve quick opening and closing within a certain nominal size range. It is a widely used environmental protection and economic valve in recent years.