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An air compressor check valve or non-return valve only has one job: allowing air to flow from one side of the compressor to the other, whilst blocking the air from flowing back in the opposite direction. The check valve is a crucial part of your air compressor. You can sometimes find up to 5 check valves on one single compressor, it all depends on the type and size of your compressor. With the help of check valves, the compressor can keep certain parts pressurized and other parts un-pressurized.