The oil shut-off valve acts as a switch controlling the main oil supply to the screw compressor head. Its function is to cut off the oil supply to the main unit when the air compressor stops, preventing lubricating oil from spraying out of the main unit and preventing oil backflow at the moment of shutdown.
Common malfunctions:
During air compressor operation, a small amount of impurities in the air will inevitably mix into the cooling oil. These impurities may cause deposits and blockages in the oil shut-off valve, preventing it from functioning properly. When the valve is closed or partially closed, the cooling oil flow will decrease, severely affecting the cooling effect of the compressor head, leading to rapid high-temperature shutdown, high-temperature alarms after startup, or lubricating oil spraying out during shutdown.
Therefore, regular cleaning and maintenance of the oil shut-off valve are necessary. Improve the operating environment of the air compressor, use it in a well-ventilated environment, away from volatile gases and floating debris, and strictly replace the air filter according to the differential pressure parameters.
The check valve, also known as a non-return valve, is mainly used in compressed air systems to prevent the compressed oil-gas mixture from suddenly spraying back into the main unit after a sudden failure and shutdown, causing the rotor to reverse.
The check valve may occasionally experience incomplete closure. The main reasons are: the rubber seal ring of the check valve is detached, or the spring is broken, requiring replacement of the spring and rubber seal ring; or there are foreign objects supporting the seal ring, requiring removal of the impurities on the seal ring.