What is a hydraulic power unit?

The hydraulic power unit is the core part of the hydraulic system, responsible for providing power to hydraulic actuators such as oil cylinders and hydraulic motors. It mainly consists of the following key components and has specific functions:

Core functions
Convert mechanical energy (driven by motors or engines) into hydraulic energy (high-pressure oil flow) to provide power for hydraulic systems.
By controlling the flow direction, pressure, and flow rate of the oil, the actuator is driven to complete actions such as pushing, pulling, and rotating.

Main components
Hydraulic pump: the core power component responsible for converting mechanical energy into hydraulic energy and outputting high-pressure oil.
Motor/Engine: The power source that drives the operation of a hydraulic pump (such as an electric motor or diesel engine).
Oil tank: stores hydraulic oil and helps dissipate heat and settle impurities.
Control valves (such as directional valves, pressure valves, flow valves): regulate the flow direction, pressure, and flow rate of oil, and control the action of actuators.
Filter: Keep the oil clean to prevent impurities from damaging hydraulic components.
Cooling/heating device (optional): Maintain the oil temperature within a reasonable range to ensure stable operation of the system.

Typical applications
Construction machinery (excavators, cranes, loaders, etc.)
Industrial equipment (injection molding machines, stamping machines, machine tools, etc.)
Mobile devices (agricultural machinery, fire trucks, special vehicles, etc.)
Automation systems (robots, production lines, etc.)

Main features 
High power density: Small in size but capable of outputting tremendous power, suitable for heavy-duty conditions.
Strong load adaptability: By adjusting the pressure valve, it can automatically match different load requirements.
Flexible layout: The power unit can be installed independently, and the actuator can be remotely arranged.
Good impact resistance: Hydraulic oil can absorb vibration and impact, protecting mechanical structures.

Common Categories
By driving mode: electric hydraulic power unit, diesel/gasoline engine driven hydraulic power unit.
According to structural form: compact (integrated), decentralized (pump and tank separated).
By control mode: manual control, solenoid valve control, proportional/servo control (high-precision).