Function of the Oil Shut-off Valve:When the air compressor starts up, the oil shut-off valve opens, allowing lubricating oil—having passed through the oil filter—to flow into the main unit. Once the air compressor shuts down, the valve closes, thereby cutting off the oil supply. Essentially, the oil shut-off valve acts as a switch controlling the flow from the main oil circuit into the compressor's air end (head). Its primary purpose is to interrupt the oil supply to the main unit upon shutdown, preventing lubricating oil from being expelled through the air end's outlet and averting oil backflow at the precise moment of shutdown.
Common Associated Faults:
1. High-Temperature Shutdown Immediately After Startup:** This fault occurs because the oil shut-off valve failed to open, preventing lubricating oil from entering the air end. **Solution:** Maintenance personnel must regularly inspect and maintain the oil shut-off valve.
2. Air Compressor High-Temperature Alarm:** This fault indicates that the oil shut-off valve has not opened fully, resulting in an insufficient volume of lubricating oil flowing into the air end. **Solution:** The oil shut-off valve requires regular cleaning and maintenance.
3. Lubricating Oil Spraying Back into the Air Filter During Sudden Shutdown:** This fault arises when the air compressor undergoes a sudden shutdown, and the oil shut-off valve fails to close in time or does not seal tightly, causing lubricating oil to spray back into the air filter housing. **Solution:** Ensure, as much as possible, that the air compressor operates in a clean and favorable environment; additionally, perform regular cleaning and maintenance on the oil shut-off valve to prevent blockages caused by the accumulation of impurities.