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Testing of compressor pressure relif valves

The pressure relief valve acts as a backup safety device to the pressure switch. It is designed to automatically open when the pressure in the receiver reaches dangerous levels. The pressure relief valve is tested by running the air compressor with the pressure switch fully open. When the pressure switch is fully open it cannot shut down the compressor.
The pressure relief valve should open automatically when the pressure reaches 25 psi above the normal operating pressure. If the pressure relief valve does not open it may be defective. The valve may also be defective if it opens before the receiver reaches normal operating pressure. Defective relief valves must be replaced before the compressor is restarted
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