The pressure setting varies based on the cut-out PSI of the compressor, and is typically 20-25 PSI higher than the cut-out pressure. If the valve fails to release within this range it will need to be replaced. The pressure valve will reset once it drops back within standard operating pressure.
DANGER: DO NOT ATTEMPT TO ADJUST THE SAFETY VALVE. DO NOT USE COMPRESSOR WITH A MALFUNCTIONING SAFETY VALVE!