Maintenance work during grease injection of Ball Valve

Professional maintenance work of Ball Valve before welding, before production and after production plays a vital role in serving Ball Valve in production operation. Correct, orderly and effective maintenance will protect the Ball Valve, make the Ball Valve function normally and extend the service life of the Ball Valve. The maintenance work of Ball Valve seems simple, but it is not. There are often neglected aspects in the work.

1. When greasing the Ball Valve, the problem of grease injection amount is often ignored

After the grease gun is refueled, the operator selects the Ball Valve and grease injection connection method, and then performs grease injection. There are two situations: on the one hand, the amount of grease injection is small and the grease injection is insufficient, and the sealing surface accelerates wear due to lack of lubricant. On the other hand, excessive grease injection causes waste. It is because the sealing capacity of different Ball Valve is not accurately calculated according to the type of Ball Valve. The sealing capacity can be calculated according to the size and type of the Ball Valve, and then the appropriate amount of grease is reasonably injected.

2. When greasing the Ball Valve, the pressure problem is often ignored

During the grease injection operation, the grease injection pressure changes regularly in peaks and valleys. The pressure is too low, the seal leaks or fails. The pressure is too high, the grease injection port is blocked, the grease in the seal hardens, or the seal ring and the valve ball and valve plate are locked. Usually, when the grease injection pressure is too low, the injected grease flows into the bottom of the valve cavity, which usually happens in small gate valves. If the grease injection pressure is too high, on the one hand, check the grease injection nozzle. If the grease hole is blocked, replace it according to the situation; on the other hand, if the grease is hardened, use cleaning fluid to repeatedly soften the failed sealing grease, and inject new grease to replace it. In addition, the seal model and seal material also affect the grease injection pressure. Different seal forms have different grease injection pressures. Generally, the grease injection pressure of hard seals is higher than that of soft seals.