Which term refers to a device that regulates system pressure to maintain a constant discharge pressure?

• A. Ramp breakover angle
• B. Pressure governor
• C. Relay Pumping
• D. Preservice test

Answer: (B)

A pressure governor is the device that automatically keeps discharge pressure steady by sensing the system pressure and regulating the pump’s output to match a setpoint. As the discharge pressure rises above the desired level, the governor reduces the pump’s output; when pressure drops, it increases output. This keeps the pressure constant even as demand changes or engine speed varies, which is crucial for maintaining consistent hose line pressure in a fire pump or other hydraulic system. The other terms don’t describe regulating discharge pressure: a ramp breakover angle relates to switching or relay timing, relay pumping is about coordinating multiple pumps for capacity, and a preservice test is simply a pre-use check, not a pressure-control device.