What is the primary function of a safety valve on a boiler?

The primary function of a safety valve on a boiler is crucial for maintaining the safety and integrity of the boiler system. Specifically, the safety valve serves to protect the boiler from exceeding its Maximum Allowable Working Pressure (MAWP). When the pressure within the boiler reaches a predetermined level, the safety valve opens automatically to release steam or gas, thereby preventing potential overpressure conditions that could lead to catastrophic failures, such as explosions or structural damage to the boiler itself.

This safety mechanism is essential in ensuring that the boiler operates within safe pressure limits, thus safeguarding both the equipment and personnel in the vicinity.

The other functions like increasing pressure, controlling water levels, and enhancing combustion are not the purpose of a safety valve. Instead, they pertain to different systems and controls within the boiler operation that serve distinct roles in the overall functioning of the boiler. For instance, pressure is typically managed by pumps and regulators, while water levels are monitored and controlled by specific water level controls, and combustion is optimized through controls that manage fuel and air supply.