What is the function of a relief valve in a boiler?

The function of a relief valve in a boiler is to release pressure or relieve blockages. This valve is a critical safety component designed to protect the boiler and its components from excessive pressure build-up, which can be dangerous. In the event that the pressure within the boiler exceeds a predetermined limit, the relief valve opens automatically to allow steam or water to escape, thereby reducing the pressure back to safe levels. This helps prevent potential accidents, such as boiler explosions, which can occur if the pressure is not adequately controlled.

The other options, while related to important aspects of boiler operation, do not pertain to the primary function of a relief valve. For instance, increasing efficiency typically involves optimizing fuel use and heat transfer, which is outside the scope of a relief valve's function. Maintaining water quality involves treatments and testing to prevent corrosion and scaling, also unrelated to the role of a relief valve. Measuring fuel consumption deals with calculating how much fuel the boiler uses, which is another distinct function not served by a relief valve. Thus, the role of a relief valve is specifically focused on managing pressure within the boiler system to ensure safe operation.