1. When the multi-way valve is filled with fat, it is easy to ignore the amount of fat. After the grease gun is refueled, the operator selects the multi-way valve and the grease connection mode, and then performs the grease injection operation. There are two situations: on the one hand, the amount of fat injection is insufficient, resulting in a lack of lubricant and wear. On the other hand, too much fat injection causes waste. The reason is that there is no accurate calculation of the sealing capacity of different valves based on the type of multi-way valve. The sealing capacity can be calculated based on the size and type of the multi-way valve, and then a reasonable amount of grease can be injected.

2. When multi-way valve is filled with grease, the pressure problem is often ignored. During the fat injection operation, the fat injection pressure changed 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 is hardened, or the seal ring is locked with the valve ball and valve plate. Usually when the grease injection pressure is too low, the injected grease flows into the bottom of the multi-way valve cavity. The grease injection pressure is too high. On the one hand, check the grease injection nozzle, and replace it if the fat hole is blocked; on the other hand, if the grease is hardened, use a cleaning liquid, repeatedly soften the failed sealing grease, and inject new grease to replace .