What is the main function of a pressure governor?

The main function of a pressure governor is to regulate engine speed to match pump discharge requirements. This is crucial for fire apparatus because maintaining the proper pump pressure ensures that the water flow from the nozzle is effective for firefighting efforts. The pressure governor monitors the pressure in the pump system and adjusts the engine speed to increase or decrease the flow of water as needed, thus ensuring that firefighters have a consistent and adequate supply of water at the desired pressure.

By effectively managing engine speed in response to the discharge pressures, the pressure governor plays a vital role in optimizing the performance of the pump, enhancing safety, and preventing damage to the fire apparatus that could occur from pressure fluctuations. Understanding this function is essential for operators to ensure efficient operation during firefighting scenarios.