How to reduce the dead weight of the ball of the pneumatic ball valve and extend the service life of the pneumatic ball valve Pneumatic ball valves can be divided into floating pneumatic ball valves and fixed pneumatic ball valves according to the ball structure. However, no matter the pneumatic ball valves with ball structure, especially the pneumatic ball valves with large specifications and diameters, the dead weight of the ball valve will adversely affect the sealing performance and service life of the valve. For example, the ball of a floating pneumatic ball valve has no lower stem support shaft, so the fitting surface of the seal seat bears the dead weight of the ball. Therefore, under the same working condition, the greater the dead weight of the ball, the greater the wear on the sealing fitting surface of its gravity direction, which greatly reduces the service life of the pneumatic ball valve. At the same time, once the preload between the ball and the seal seat disappears, the greater the mass of the ball, the greater the differential pressure necessary for low-pressure sealing, which greatly reduces the low-pressure sealing performance. Similarly, if the pneumatic ball valve is equipped with a pneumatic drive device for quick opening and closing, its inertia torque will increase several times, dozens of times. Therefore, how to find ways to reduce the dead weight of the ball will have considerable social and economic benefits for the performance, life, inertia torque and manufacturing cost of the product.

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