Definition
A valve in a hydraulic system that regulates the output of a variable-displacement pump by sensing system pressure and adjusting how much fluid the pump delivers. As system pressure rises toward the set value, the valve reduces pump output; as pressure drops, it allows the pump to deliver more fluid.
Plain English
A small valve that tells the hydraulic pump how hard to work. When the system already has enough pressure, it tells the pump to ease off. When pressure drops, it tells the pump to push harder.
Context Anchor
Seen in aircraft hydraulic system descriptions, especially where pump output pressure must be controlled for parts such as landing gear, brakes, or powered controls.
Why Pilots Care
Maintains the hydraulic pressure required for reliable operation of flight controls, brakes, and landing gear.
Intuition Check
A pump control valve is not simply an on-off switch for the pump. Its job is to manage where the pump’s fluid pressure goes and keep that pressure within the proper range.
Example Sentence 1
After the technician replaced the pump control valve, system pressure stabilized within the normal operating range.
Example Sentence 2
Replacing the pump control valve restored normal flow to the landing gear actuators.