Describe the purpose of a safety valve on a boiler.

The purpose of a safety valve on a boiler is to prevent overpressure by releasing excess steam. Safety valves are critical safety devices designed to automatically open when the pressure in the boiler exceeds a predetermined level. This function is essential because excessive pressure can lead to catastrophic failures such as explosions, putting both the equipment and personnel at risk.

By allowing steam or water vapor to escape, the safety valve maintains safe operating conditions within the boiler, ensuring that the pressure remains at or below the maximum allowable level. This mechanism is crucial for the safe operation of steam boilers and contributes to overall system integrity and reliability.

In contrast to this primary function, enhancing fuel efficiency, regulating water levels, and controlling the combustion process are not roles of the safety valve. Those tasks are managed by different components of the boiler system, such as fuel control systems, water level control devices, and combustion controls, which work alongside safety valves to ensure safe and efficient boiler operation.