A hydraulic power unit is an assembly that contains components necessary to power a hydraulic system. It generally contains the
following components:
Reservoir- Stores fluid used to power system.
Pump- Pulls fluid from the reservoir, creating flow at a fixed
rate. Pressure will develop when this flow encounters a
resistance (load).
Motor- An electric motor is usually used to turn pump.
Relief valve Used to drain fluid back into reservoir when pressure exceeds rated value. Since hydraulic systems allow almost no leakage, pressure in systems with a static load would continue to rise until something fails, if a relief valve were not present.
Filter The last component the hydraulic fluid encounters on its return to the reservoir. It removes contaminants generated by components such as valves, cylinders, and even the pump. A properly sized and maintained filter will ensure long, trouble free service.
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In addition, other components may be included in the power unit
assembly to perform ancillary functions:
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Heaters and/or coolers- To keep fluid within rated operating temperature range.
Control valves- To perform various logical and control functions, based on
requirements of system.
Electrical components- To meet specialized system requirements.
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