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

A blow-off valve in a boiler system serves the primary purpose of draining water from the boiler. This is particularly important for maintaining water quality and removing sediment or sludge that can accumulate over time. By allowing the user to expel unwanted water, the blow-off valve helps prevent corrosion and ensures the efficient operation of the boiler. Proper management of the water content also contributes to safe boiler pressure levels, thus supporting overall system reliability.

While the other options relate to functions associated with boiler systems, they do not accurately describe the specific role of a blow-off valve. For instance, releasing steam is typically handled by safety valves, adjusting pressure is a function of pressure control systems, and regulating fuel is managed by fuel control valves, all of which serve different critical functions in boiler operation.