What does a low-pressure switch do in a boiler system?

A low-pressure switch in a boiler system is a crucial safety device that closely monitors the pressure within the boiler. When the pressure drops below a predetermined level, the switch activates, leading to a shutdown of the boiler. This function is critical for preventing potential hazards such as water hammer, boiler flooding, or even catastrophic failures that can occur if the system operates under unsafe conditions. By ensuring that the boiler does not run at low pressure, the low-pressure switch helps maintain the integrity of the system and protects both the equipment and personnel from dangerous situations.

The other options focus on different operational aspects of boiler systems; however, they do not directly relate to the primary function of the low-pressure switch. Regulating fuel flow, monitoring water levels, and controlling exhaust gas temperatures are managed by other components and systems within the boiler, ensuring efficient and safe operation in conjunction with the safety measures provided by the low-pressure switch.