Pneumatic ball valve was evolved from the plug. It has the same movement rotated 90 degrees, is the cock body is different sphere, there are circular holes or channels through its axis. Sphere and the ratio should be such that when the ball is rotated 90 degrees, in the import and export office should be fully rendered sphere, thus cutting off the flow. This type valve in the pipe can be installed anywhere.

Pneumatic ball valve works by rotating the valve spool to flow or occlusion. Pneumatic ball valve switch light, small size, can be made into a large-caliber, reliable sealing, simple structure, easy maintenance, regular spherical surface and seal in the closed state, the media is not susceptible to erosion pneumatic ball valve, in all industries are widely application. Pneumatic ball valve and plug valve of a type is the same, only it's shut down parts of a sphere, the sphere rotates around the body center line to achieve the opening and closing a valve. http://www.51orders.com/showroom/Pneumatic-Ball-Valve.htm