Pneumatic ball valves are evolved from plug valves. The ratio of the spherical surface to the passage opening should be such that when the ball is rotated 90 degrees, the spherical surface should be present at the entrance and exit, thereby cutting off the flow. This type of valve can be installed in any position in the pipeline. Pneumatic ball valves only need to be rotated 90 degrees with a pneumatic actuator and a small torque can be closed tightly. The fully equal valve body cavity provides a small, straight-through flow path for the medium. Ball valves are generally considered to be the most suitable for direct opening and closing, but recent developments have designed ball valves to provide throttling and control flow. The main features of the ball valve are its compact structure, easy operation and maintenance, suitable for general working media such as water, solvent, acid and natural gas, and also suitable for medium with harsh working conditions such as oxygen, hydrogen peroxide, methane and ethylene. The ball valve body may be integral or combined.

The pneumatic ball valve works by rotating the valve plug to make the valve unblocked or occluded. The pneumatic ball valve switch is light in weight and small in size, and can be made into a large diameter, reliable in sealing, simple in structure, convenient in maintenance, and the sealing surface and the spherical surface are often closed, and is not easily eroded by the medium, and is widely used in various industries.

The pneumatic ball valve and the plug valve are the same type of valve, only the closing member of which is a ball, and the ball rotates around the center line of the valve body to open and close a valve.