The Way 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 way to improve the quality of the sealing pair of pneumatic ball valve The dead weight of the ball will have an adverse impact 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, it is far from meeting the technical requirements for the quality of the sphere. The other is the ball welded with multiple plates. The single weld has multiple processes, which is not suitable for batch production. Shanghai Shenyuan Valve Co., Ltd. has explored a unique processing method, called plate balling process. 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.

3. The linear structure in the central line type structure is composed of the valve body, inner lining (PTFE or rubber), (stainless steel valve plate or chrome plated steel valve plate) and valve shaft. The medium streamline structure design is similar to the straight line, with good adjustment performance. The sealing structure is centered linear sealing, and the sealing performance is reliable to achieve two-way sealing and zero leakage. It can be installed anywhere.