Process Control Systems
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Process Control Systems



The Powerpack is a kind of an electro-hydraulic actuator. It is of the proportional positioning type and has a hydraulic work piston that is proportional to the electrical system, with the function of converting a DC electrical signal (DC 4-20mA) into a motion of the hydraulic work piston. The Powerpack is of a structure that unitizes the currenthydraulic pressure converter unit, the hydraulic pump and the work cylinder, and it does not require external piping.

  • Receives electrical signals and outputs high-speed, high-powered hydraulic output.
  • Because a hydraulic servo valve is used in the controller, high response and easy maintenance assure high reliability.
  • An electric feedback system is used.
  • A power supply is required only for the motor. No power supply is needed for the amplifier because it has a built-in transformer.
  • Manual local operation can be selected.
  • Opening output signals (4 to 20 mA) are available as standard.
  • No oil leaks from joints because the work cylinder and control elements are integrated into the oil reservoir.
  • No external piping is needed.
  • Safety functions are provided.

The crank arm moves in the safety direction when input signals are abnormal (excessively low or high) or the wiring of the feedback potentiometer is broken. The direction for safe movement can be changed as required.

The hydraulic unit of the Powerpack consists of an electrical current-hydraulic converter (servo valve), hydraulic pump, and actuator cylinder. The compact cast-iron reservoir incorporates an actuator cylinder, pump, crank, and feedback mechanism, and requires no external piping. An amplifier and an AUTO/MANUAL switch are provided inside the box on the reservoir to simplify operation at the workplace.


Common Specifications
Input signal 4 - 20mA DC
Input resistance 250Ω
Opening output signal 4 - 20mA DC (max. load 250Ω)
Control action Proportional action
Operating direction Can be changed to any direction
Linearity 2%
Hysteresis error (no load) 2%
Temperature drift 5% (0 - 60˚C)
Maximum crank rotation 60˚
Installation Horizontal
Ambient temperature -10 - +50˚C
Temperature range of hydraulic fluid +10 - +50˚C
Paint Silver
Manual operation function AUTO/MAN,OPEN/CLOSE
Specifications by model
Operating torquekN·mMax 1.2 * 2.4
Min 0.9 * 1.8
Maximum no-load speed (standard setting)°/sec 4 - 5 3 - 4
Hydraulic pressureMPa 2 2.2
Cylinder bore X strokemm Ø80 × 120 Ø100 × 140
Length of crank armmm 250 300
Motor (3Ø, 4P) 0.4kW 3Ø 4P 0.75kW 3Ø 4P
Oil required 18(21 for ACC) 28.5(35 for ACC)
Mass (excl. hydraulic fluid)kg 115 150