Pressure problems are often overlooked during valve grease injection.

In the specific fat-injection operation, the pressure of fat-injection presents a regular increase and decrease. When the pressure is too low, the seal may fail and the injected oil will flow into the bottom of the valve chamber, which usually happens in small gate valves. The other case is that the pressure of grease injection is too high, resulting in grease injection mouth blockage, closed grease or sealing ring and lock. The grease nozzle needs to be checked to see whether the grease injection blockage needs to be replaced; On the other hand, if the grease has hardened, you need to use a cleaning fluid, wash the failed grease several times, and add new grease to replace. In addition, attention should be paid to the sealing type and sealing material of the valve. Different manufacturers will adopt different sealing forms, which will correspond to different grease injection pressure. Generally, the higher the pressure is, the higher the grease injection pressure is.

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