Routine maintenance of all welded pneumatic ball valve and maintenance during grease injection The problem of grease injection amount is often ignored when grease injection is conducted to the grease injection valve of all welded pneumatic ball valve. After the grease gun is refueled, the operator selects the grease valve and grease connection mode to conduct grease injection. In the process of grease injection, on the one hand, the amount of grease injection is small and insufficient, and the sealing surface is accelerated to wear due to the lack of lubricant. On the other hand, excessive grease injection causes waste. The reason is that the sealing capacity of different valves has not been accurately calculated according to the nominal diameter of the valve, and the sealing capacity has been calculated, and then an appropriate amount of grease has been reasonably injected.

The ball valve is mainly used to cut off or connect the medium in the pipeline, and can also be used for fluid regulation and control. Compared with other valves, the pneumatic O-ring ball valve has the following advantages:
1. The fluid resistance is small, and the ball valve is one of the valves with small fluid resistance. Even the reduced diameter ball valve has relatively small fluid resistance.
2. The thrust bearing reduces the friction torque of the valve stem, which can make the valve stem operate stably and flexibly for a long time.
3. The sealing performance of the valve seat is good. The sealing ring made of elastic materials such as polytetrafluoroethylene is easy to seal, and the sealing capacity of the ball valve increases with the increase of the medium pressure.
4. The valve stem seal is reliable. Because the valve stem only operates as if it is rotating rather than lifting, the packing seal of the valve stem is not easy to be damaged, and the sealing capacity increases with the increase of the pressure of the medium.
5. Due to the good self-lubricating property of materials such as polytetrafluoroethylene and small friction loss with the ball, the service life of the ball valve is long.
6. The lower mounted valve stem and the convex step at the head of the valve stem prevent the valve stem from ejecting. If the valve stem seal is damaged due to fire, metal contact can also be formed between the convex step and the valve body to ensure the valve stem sealing.
7. Anti static function: set a spring between the ball, valve stem and valve body, and the pneumatic O-ring ball valve can lead out the static electricity generated during the switching process.