1, often ignore the issue of fat injection
After the grease gun is refueled, the operator selects the valve and the method of grease injection and then performs the grease injection operation. There are usually two situations: On the one hand, the grease injection is insufficient and the sealing surface is accelerated due to lack of lubricant.
On the other hand, excessive grease injection causes waste. The seal capacity should be calculated based on the size and type of valve, and a reasonable amount of grease should be injected.
2, often ignore the pressure problem
During the grease injection operation, the pressure of the grease injection changes regularly with 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 internal grease hardens or the seal ring and valve ball, and the valve plate hold dead. Usually when the injection pressure is too low, the injected grease flows into the bottom of the valve chamber, which usually occurs in the small gate valve, and the injection pressure is too high. On the one hand, the grease injection nozzle is checked, and if the grease hole is blocked, the situation is confirmed and replaced; on the other hand, It is the hardening of lipids. It is necessary to use a cleaning solution, repeatedly soften the failed sealing grease, and inject a new grease to replace it.
In addition, the sealing type and the sealing material also affect the injection pressure. Different sealing types have different injection pressures. In general, the hard sealing pressure is higher than the soft sealing.
3, often ignore the issue of fat injection
In the grease filling operation, the pressure, grease injection amount, and switch position are all normal, but to ensure the valve grease injection effect, sometimes the valve needs to be opened or closed, and the lubrication effect is checked to confirm that the surface of the valve ball or the gate plate is lubricated evenly. Attention should be paid to valve body drainage and plugging pressure relief problems. After the valve pressure test, the gas and moisture in the valve chamber of the sealed chamber are boosted due to the increase of the ambient temperature. During the injection of grease, the pressure should be discharged first to facilitate the grease injection. The smooth progress. After the grease injection, the air and moisture in the sealed chamber are fully replaced, and the pressure in the valve chamber must be promptly vented. This also ensures the safe use of the valve. After the grease injection is completed, the sewage and pressure plug must be tightened to prevent accidents. .
Pay attention to matters when filling the valve:
1, pay attention to the problem of the valve in the switch position
Ball valve maintenance is generally in the open state, under special circumstances choose to close the maintenance, other valves can not be opened in theory, the gate valve in the maintenance must be closed, to ensure that the seal ring filled with grease along the seal groove, if In the open position, the sealing grease is directly dropped into the flow path or valve chamber, causing waste.
2. Pay attention to the problem of even fat when injecting fat
During normal fat injection, the grease outlet closest to the grease injection port will be greased first, then to the low point, and finally to the high point. The fat will be produced successively. If it is not according to the law or fat, it is confirmed that there is a blockage. .
3, pay attention to the valve diameter and the seal ring seat flush problem
For example, if the ball valve is open, the opening limiter may be adjusted inwards. After the straightness is locked, the adjustment limit can only be used to open or close a position. To consider the whole, if the open position is flush, If the valve is not closed, the valve will not be closed tightly and the same reasoning will be applied. In order to adjust the position, it is also necessary to consider the opening adjustment and ensure the correct angular stroke of the valve.
4, also pay attention to the injection of fat at the valve stem
There is a sliding sleeve or packing on the valve shaft. It is also necessary to maintain the lubrication state to reduce the frictional resistance during operation. If the lubrication cannot be ensured, the torque will be increased when the motor is operated, and the switch will be laborious when operated manually.