Answer: If the outlet check valve is not closed tightly after the air compressor is shut down, the pressurized air in the system will enter the shut-down air compressor system. The leakage will keep a certain pressure in the system. At this time, the discharge solenoid valve will continue to exhaust air, and the oil contained in the exhaust will cover the inlet air filter element, thereby reducing the service life of the air filter element. If the check valve is not closed tightly, the air compressor shaft seal ring will be deformed under pressure for a long time, and even damage the seal ring lip, causing oil seal leakage. The oil and gas barrel may also not display the normal oil level due to the pressure.
