🔍 Key Concepts

• Excess pressure governor purpose and what condition it protects against • Which system or piece of equipment is most sensitive to overpressure on the discharge side • How fans vs pumps vs turbines respond when downstream valves or dampers close

💭 Think About

• Think about which device would be most at risk if its outlet were suddenly blocked while it was still being driven at full power. • Ask yourself: on which system would you most logically install a device that automatically reduces drive when the discharge pressure gets too high? • Compare how dangerous high pressure is to the casing of pumps, to the blades/housing of fans, and to turbine casings.

✅ Before You Answer

• Identify which choice normally operates against a closed or variable resistance on the outlet side (valves, dampers, etc.). • Consider which equipment would continue to build pressure if flow is restricted, rather than just reducing flow with little pressure rise. • Verify which of the four is commonly fitted with a governor that reacts directly to discharge pressure rather than shaft speed or flow.