How does a pressure governor function?

The function of a pressure governor is fundamentally linked to maintaining a consistent pump discharge pressure during operation. Specifically, it regulates the engine's power output in response to the demands of the hydraulic system. When a pump is delivering water, the pressure governor continuously monitors the discharge pressure and adjusts the engine speed accordingly. If the pressure drops, the governor increases the engine's RPMs to bring the pressure back up. Conversely, if the pressure exceeds the desired level, it will lower the RPMs to reduce the pressure.

This mechanism ensures that the fire apparatus can provide a steady, reliable supply of water at the necessary pressure for firefighting operations. The effective regulation of power output in relation to the pump’s needs is crucial for both performance and safety, preventing situations where the equipment might otherwise operate inefficiently or under excessive stress.

Understanding this function highlights the importance of the pressure governor in maintaining the functionality and reliability of firefighting equipment in high-pressure situations.