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Aviation Glossary :: System-Pressure Regulator  Aviation Glossary :: System-Pressure Regulator FAA Written Test Preparation
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System-Pressure Regulator
System-Pressure Regulator
A type of hydraulic system-pressure control valve. When the system pressure is low, as it is when some unit is actuated, the output of the constant-delivery pump is directed into the system. When the actuation is completed and the pressure builds up to a specified kick-out pressure, the pressure regulator shifts. A check valve seals the system off and the pressure is maintained by the accumulator. The pump is unloaded and its output is directed back into the reservoir with very little opposition. The pump output pressure drops, but the volume of flow remains the same. When the system pressure drops to the specified kick-in pressure, the regulator again shifts and directs fluid into the system. Spool-type and balanced-pressure-type system pressure regulators are completely automatic in their operation and require no attention on the part of the flight crew.
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source: FAA Aviation Maintenance Technician Airframe Handbook (FAA-H-8083-31)


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