How does the pressure relief valve function in an air compressor?

The pressure relief valve serves a critical safety function in an air compressor system. Specifically, it is designed to open and allow excess air to escape when the pressure within the compressor reaches a level that exceeds its safe operating limit. This prevents potential over-pressurization, which can lead to equipment failure or even catastrophic failure of the compressor. By releasing air, the pressure relief valve ensures that the system remains within safe operating conditions, protecting not just the compressor but also the overall integrity of the system and the safety of personnel nearby.

In contrast to this, options that suggest the valve shuts off the compressor, indicates pressure, or ensures continuous operation misrepresent the primary role of the pressure relief valve. Instead, it is fundamentally about maintaining safe pressure levels rather than controlling operation modes or providing pressure readings.