What is the main function of a boiler pressure relief valve?

The primary function of a boiler pressure relief valve is to allow excess pressure to escape from the boiler system. This is crucial for maintaining safe operating conditions. When the pressure within the boiler exceeds the maximum safe limit, the relief valve automatically opens to release steam or water vapor, thereby preventing a dangerous buildup of pressure that could lead to catastrophic failures such as explosions or boiler ruptures.

This safety mechanism ensures that the boiler operates within its designated pressure range, protecting both the equipment and the personnel operating it. By acting as a fail-safe, the pressure relief valve is a fundamental component in boiler safety systems, ensuring that pressure is maintained at safe levels under all operating conditions. Other options, while they may pertain to different aspects of boiler operation, do not align with the primary purpose of a pressure relief valve.