Pneumatic ball valve in the pipe is mainly used to make cutting speed, distribution and change the direction of the flow medium. Pneumatic ball valve is widely used in recent years a new type of valve, it has the following advantages:1 fluid resistance is small, the drag coefficient with the same length of pipe equal. 2has the advantages of simple structure, small volume, light weight. 3closely reliable, valve sealing surface material is currently widely used in plastic, sealing well, in the vacuum system has also been widely used. 4 the operation is convenient, rapid opening and closing, from full-to full-clearance as long as the rotation of 90°, to facilitate remote control. 5repair convenient, pneumatic ball valve has the advantages of simple structure, seals are generally activities, the removal of the replacement is more convenient. 6 in the fully open or fully closed, ball and valve seat sealing surface and the dielectric isolation, through the media, will not cause erosion of the valve sealing surface. 7applicable to a wide range of sizes, from small to several millimetres, a few meters from the large, high pressure can be high vacuum applications. 8 for the pneumatic valve power source is used in gas, usually 0.2-0.8MPa pressure, relatively safe. Pneumatic ball valve if leakage, relative hydraulic, electric, gas can be discharged directly, no pollution to environment, and has the higher safety. 9 with respect to the manual and the turbine to rotate the ball valve, pneumatic ball valve can be large diameter configuration, (manual and turbine rotary ball valve generally in the DN300caliber following, pneumatic valve current can reach DN1200caliber. ) Pneumatic ball valve has been widely used in petroleum, chemical, electric power, papermaking, atomic energy, aviation, rockets and other departments, as well as in our daily life.