Pneumatic three-piece ball valve is evolved from the cut-off valve. It has the same 90 degree rotation action, except that the plug body is a sphere with a circular through hole or passage through its axis. The ratio of the sphere to the port should be such that when the sphere is rotated 90 degrees, the sphere should be fully spherical at the inlet and outlet to cut off the flow. Pneumatic three-piece ball valve is widely used in recent years, a new type of valve, pneumatic three-piece ball valve in the pipeline is mainly used to cut off the speed, distribution and change the flow direction of the medium. It has the following advantages: 1. Pneumatic three-piece ball valve fluid resistance is small, the coefficient of resistance and the same length of pipe equal. 2. Simple structure, small size, light weight. 3. Tight and reliable, the current ball valve sealing surface material widely used plastic, good sealing, vacuum system has also been widely used. 4. Pneumatic three-piece ball valve easy to operate, open and close quickly, from full to complete turn as long as 90 °, easy to remote control. 5. Easy maintenance, pneumatic valve structure is simple, the seals are generally active, demolition and replacement are more convenient. 6. In the fully open or fully closed, the ball and valve seat sealing surface and media isolation, the media will not cause erosion of the valve sealing surface. 7. Pneumatic three-piece ball valve wide range of applications, diameter from a few millimeters, up to a few meters, from high vacuum to high pressure can be applied.
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