What is the main function of a pressure governor?

The primary function of a pressure governor is to adjust the engine's RPMs based on changes in incoming pressure. This is crucial for maintaining consistent water pressure in the fire service context. When the nozzle is opened or closed, it causes variations in pressure; the governor senses these changes and automatically modifies the engine speed to compensate. By doing so, it ensures that the pump is operating at the optimal performance level, providing the necessary water flow and pressure to effectively fight fires.

Maintaining appropriate pressure not only enhances firefighting effectiveness but also protects the pump and the engine from damage caused by pressure fluctuations. This automatic adjustment facilitates safer and more efficient operations, which is essential in emergency scenarios where precise water delivery is critical.