What is the primary function of a pressure governor in a pumping system?

• A. Control engine speed based on pump pressure
• B. Maintain constant engine speed regardless of pump pressure
• C. Control discharge pressure independent of engine
• D. Increase pump capacity during surge

Answer: (A)

The main idea is to use the pressure reading at the pump discharge to control the engine speed so the discharge pressure stays at a set target. The governor senses the pump’s discharge pressure and adjusts throttle: if pressure is below the desired value, it increases engine speed to raise pressure; if pressure is at or above the target, it reduces speed to held it steady. This keeps the system delivering a consistent pressure even as demand changes, and it also helps save fuel and reduce wear by not running the pump harder than needed. The other ideas—keeping the engine speed fixed regardless of pressure, making discharge pressure independent of the engine, or simply increasing capacity during surge—do not describe how a pressure governor maintains a stable, controlled discharge pressure.