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Common faults of oil cut-off valve and one-way valve of screw air compressor

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Update time : 2021-05-14 11:55:47

1. Oil cut-off valve

The oil cut-off valve is a switch used to control the main oil path into the screw head. Its function is to cut off the oil supply to the main engine when the compressor is stopped, so as to prevent the lubricating oil from spraying from the main engine port, and the oil backflow occurs at the moment of shutdown. .

Common malfunctions:

During the use of the compressor, a small part of the impurities in the air will inevitably be mixed into the cooling oil. When it flows through the oil cutoff valve, it may cause precipitation and blockage, so that the oil cutoff valve cannot be opened with the opening of the equipment. In the closed or semi-closed state, the cooling oil flow is reduced, which seriously affects the cooling effect of the machine head, causing rapid high temperature trip after starting up, high temperature alarm or back spraying of lubricating oil when shutting down.

Therefore, users need to clean and maintain the oil shutoff valve regularly, optimize the compressor operating environment, use it in an environment with good ventilation and heat dissipation, away from volatile gases, debris and floating debris, etc., and replace the air filter in strict accordance with the pressure difference parameter requirements. .

2. Check valve

One-way valve is also called check valve or check valve, commonly known as one-way valve. In the compressed air system, it is mainly used to prevent the compressed oil and gas mixture from being suddenly back-injected into the main engine when the machine is shut down due to a sudden failure, causing the rotor to turn.

One-way valve sometimes fails to close tightly. The main reasons are: the rubber sealing ring of the one-way valve falls off, the spring is broken, the spring and the rubber sealing ring need to be replaced; there is a foreign body supporting the sealing ring, and the impurities on the sealing ring need to be cleaned.


There are many types of compressor valves, different working principles and working environments, so the reasons for valve failures and the corresponding compressor failure phenomena are different. Our technicians can only ensure the safe and long-term stable operation of the compressor after thoroughly understanding and mastering the composition of the valve and the cause of its failure, thereby improving production efficiency.