What is the purpose of a pressure relief valve in a boiler?

A pressure relief valve is a critical safety device in a boiler system designed specifically to protect the boiler and its components from dangerously high pressure that could lead to explosions. The primary function of this valve is to automatically release steam, water, or gases when the pressure inside the boiler exceeds a predetermined limit. By doing so, the valve ensures that the pressure remains within safe operating levels, thus preventing catastrophic failures.

When pressure builds up beyond safe limits, the pressure relief valve opens, allowing excess pressure to escape safely. This action not only safeguards the boiler itself but also protects the surrounding area from potential hazards associated with overpressure conditions. It is an essential component in maintaining operational safety in steam boilers.

The other options, while related to boiler operation, do not pertain directly to the function of a pressure relief valve. Increasing water temperature, regulating fuel supply, and measuring water levels are important aspects of boiler management but do not address the critical safety function provided by the pressure relief valve.