What is the purpose of a boiler pressure relief valve?

The purpose of a boiler pressure relief valve is fundamentally to prevent excessive pressure buildup within the boiler system. When the pressure inside the boiler exceeds the designed safe limits, the pressure relief valve opens to release steam or water, thereby lowering the pressure and preventing potential catastrophic failures, such as boiler explosion or damage to the integrity of the system. This safety mechanism is crucial in maintaining operational safety standards and protecting both the equipment and personnel.

Regulating the fuel supply to the boiler relates to combustion management rather than pressure control, which is why that choice does not serve the described function. Similarly, increasing steam temperature is typically achieved through the application of heat rather than pressure management. Lastly, while enhancing boiler efficiency is essential, it is not the primary role of the pressure relief valve; instead, the valve's core function focuses on safety and pressure regulation.