What does the pressure relief valve do in a boiler system?

The pressure relief valve plays a critical role in a boiler system by serving as a safety mechanism designed to protect the system from excessive pressure buildup. Boilers operate under high pressure conditions, and if pressure exceeds safe levels due to factors such as a malfunction or failure within the system, the pressure relief valve automatically opens to release steam or water. This action prevents potential catastrophic failures, such as explosions or ruptures, thereby ensuring the safety and integrity of the boiler and surrounding infrastructure.

In contrast, the other options do not accurately describe the function of the pressure relief valve. Heating the water is performed by the burner or heating element within the boiler, while regulating water flow is typically managed by valves and pumps. Sediment removal is generally addressed through different maintenance practices and is not a role of the pressure relief valve. Thus, the pressure relief valve is essential for maintaining safe operating conditions within the boiler system.