What is the role of a blow-off valve in a boiler system?

A blow-off valve in a boiler system serves the important function of removing sediment and impurities that accumulate over time. During normal operation, water used in boilers can contain minerals, scale, and other contaminants. These impurities can settle at the bottom of the boiler, which can lead to reduced efficiency, overheating, or even significant damage if not addressed.

By opening the blow-off valve, operators can discharge a portion of the water and the sediment it contains from the bottom of the boiler. This process not only helps keep the system clean but also allows for the maintenance of proper water quality, ensuring that the boiler operates safely and efficiently. Regular use of the blow-off valve is a crucial aspect of boiler maintenance and contributes to the overall longevity and performance of the system.

While the other options present functions that are related to boiler operation, they do not accurately describe the primary role of a blow-off valve.