Three Ways to Improve the Quality of Sealing Pair of Pneumatic Ball Valve
1. Ball of pneumatic ball valve The ball of pneumatic ball valve can be divided into floating pneumatic ball valve and fixed pneumatic ball valve. However, no matter what kind of ball, especially large pneumatic ball valve, the dead weight of the ball will bring adverse effects on the sealing performance and service life of the valve. For example, the ball of the floating ball has no supporting shaft, so the fitting surface of the seal seat bears its dead weight. Therefore, under the same working condition, the greater the dead weight of the ball, the greater the wear on the sealing fitting surface in its dead weight direction, which greatly reduces the service life of the pneumatic ball valve. At the same time, once the preload of the bath towel between the sphere and the seal seat disappears, the greater the mass of the ball, the greater the differential pressure necessary to reduce the sealing, which greatly reduces the low-pressure sealing performance. Similarly, if the pneumatic ball valve is equipped with a pneumatic device for quick opening and closing, its inertia torque will be several times, dozens of times increased. Therefore, how to think of ways to reduce the dead weight will have considerable social and economic benefits for the performance and life of products, inertia torque and even manufacturing costs. Cast thin wall balls and hollow balls are used abroad, and cast balls are also used domestically. However, the casting quality cannot pass the standard. Even as a qualified part, a unique processing method, called plate balling process, has been explored. With this method, the utilization rate of plate is up to 60%, the weight is reduced by 50%, and there is only one weld, which is at a less critical fitting surface.

As a kind of pneumatic valve, pneumatic ball valve is powered by compressed air from pneumatic actuator. The ball of the pneumatic ball valve is transformed from the plug valve. Through the action of 90 ° rotation of the ball center, the ball rotates around the center line of the valve body to achieve the purpose of opening. When the ball center rotates to 90 °, the valve is in a tight closed state, and when the pneumatic actuator works, the ball valve can complete the closing action of the valve with only a small rotating torque to achieve the purpose of rapid cut-off.