When pressure governor senses excess pressure, what action does it take?

When the pressure governor detects excess pressure in the system, it automatically reduces engine speed to prevent potential damage to the pump and associated equipment. This action helps to maintain a consistent and optimal discharge pressure, which is crucial for the effective operation of firefighting equipment and for ensuring the safety of personnel. By lowering the engine speed, the pressure governor moderates the flow and pressure, allowing for a more controlled and stable operation while avoiding situations that could lead to hydraulic surges or overwhelming pressure in hoses and fittings.

The pressure governor does not shut down the pump entirely because that could interrupt the water supply needed for firefighting operations. Increasing the water intake would not address the problem of excess pressure; instead, it might exacerbate the situation by introducing even more water flow. Firing a warning signal is not a typical function of the pressure governor, as its primary goal is to manage engine speed in real-time to ensure safe and effective pump operation. Thus, reducing engine speed is the appropriate response to excess pressure detected by the governor.