What device controls pressure surge by adjusting engine speed to compensate for changes in flow?

• A. Relief Valve
• B. Pressure Governor
• C. Throttle
• D. Regulator

Answer: (B)

Pressure surge is managed by automatically adjusting engine speed as flow changes. A pressure governor monitors the discharge pressure and tweaks the engine RPM to keep the pump output steady. When flow increases and pressure tends to drop, the governor speeds up the engine to raise pump capacity and restore pressure. When flow drops and pressure tends to rise, it slows the engine to prevent overshoot. This automatic feedback helps smooth out pressure fluctuations and protects the pump and hose lines.

Relief valves simply vent excess pressure and don’t adjust engine speed. A throttle is a manual control for engine speed, not an automatic response to changing flow. A regulator maintains a set pressure in a system, but it isn’t the device that automatically modulates engine speed to compensate for flow changes.