What is the primary function of a pressure governor?

The primary function of a pressure governor is to regulate engine speed to match pump discharge pressure. This mechanism ensures that the engine responds appropriately to changes in the hydraulic demand on the fire pump. When more pressure is required due to an increase in flow demand, the pressure governor increases the engine speed, allowing the pump to maintain the desired discharge pressure. Conversely, if the flow decreases, the governor lowers the engine speed, thereby optimizing performance and preventing excessive wear on engine components.

This function is essential for effective firefighting operations, as it allows firefighters to maintain the necessary water pressure for effective suppression while ensuring fuel efficiency and engine longevity. By keeping engine speed appropriately matched to the required discharge pressure, the system helps to optimize overall pump performance in various operating conditions.