What is the reason for the large pressure difference in the air compressor?

What is the pressure difference? Is the difference between oil pressure and air pressure?
The oil pressure difference of an air compressor indicates that the pressure in the oil separator (this is the internal pressure) is not the same as the external pressure. If the pressure is one kilogram higher than the external pressure, the oil separator is broken; The pressure difference is that the air filter is not blocked. If the air compressor is blocked and it is slow, it is necessary to change the air filter.

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