As individual as your requirements

Fahlke is offering with the EHAZ® the most individual electrohydraulic actuator units that are currently available. The modular technology (MCE) in the control ensures the highest level of compactness, user friendliness and operating ability. With the completely individually configurable EHAZ® electrohydraulic control units nothing stands in the way of perfect process adaptation and therefore ideal automation, right up to the central hydraulic controls for multiple actuator controls, SSV or any other type of safety shutdown units. You have a choice among numerous components, which can be integrated in the control such as solenoid valves, hand pumps, pressure limit valves, line break detection systems for all standard or control processes of your valves or for high and low pressure protection, differential pressure controls can also be integrated for your automation. The Fahlke EHAZ® controls and actuators are leaders with regard to power consumption and handling. With the individualized process adaptation and many other advantages, this represents the key to the safe automation of your equipment.

Figure: Ehaz® Eco


Your benefits at a glance

  • Remains fully operational even after a power failure (bladder accumulator, spring technology, hand pump)
  • Torque can be increased or decreased by adjusting the operating pressure
  • No chance of leaks since the MCE technology contains no pipes or fittings such as those found in conventional controls
  • Very compact actuator unit
  • Corrosion-free thanks to stainless steel and a hard-coated aluminium alloy
  • Low cost
  • MCE technology allows easy maintenance
  • Highly effective despite low power consumption
  • Very short (1 – 2 sec.) or very long operating times possible
  • Opening and closing times can be adjusted as required
  • No necessity of additional supply lines – no need for air or gas lines to the pipeline
  • Gas or operating media cannot escape into the atmosphere (closed system)
  • Greatest degree of environmental friendliness of all actuator systems

EHAZ® Eco in detail

Technical data

Double-acting (failsafe close / failsafe open / fail in position)

Spring force return (SR)

Energy stored for up to 3 reserve actuator strokes during a power failure

Control cabinet and oil tank from mat. 1.4301

Connection terminal box (IP65)

Pipe-free high-pressure control block technology (max. 800 bar)

Emergency actuation via integrated hand pump

Local and remote control (open/close, off)

Collective fault message (oil level, motor protection switch)

System pressure monitoring (KTI) with pressure gauge

Motor rated output: max. 1.5 kW, solenoid valves: max. 20 W

Control voltage: 24 V DC (110 / 220 V DC, 115 / 230 V AC)

Power supply: 400 V AC (24 V DC, 115 / 230 / 380 V AC)

Signalling of the end positions (open/close)

Actuator protection class: IP68, control: IP65

Temperature range: -60°C to +70°C


  • Functions: ESD / SSV / Regulating
  • Pressure monitoring (high pilot and/or low pilot)
  • Line break system (pneumatic/electronic)
  • Partial stroke test (PST)
  • Control for separate assembly
  • Galvanic separation from the cathode-protected pipeline
  • Oil fill level limit switch (SIL 2)
  • Accumulator pressure monitoring with min. alarm message
  • End position signalling for underwater applications (IP68)
  • Profibus DP or Modbus interface, o.a.

Model overview

Type breakaway torque (Nm)
EHAZ double-acting
EHAZ-A-1-50-SP 20 – 200
EHAZ-A-1-63-SP 50 – 1.000
EHAZ-C-1-80-SP 500 – 4.500
EHAZ-D-1-125-SP 4.000 – 25.000
EHAZ-E-1-125-SP 20.000 – 60.000
EHAZ-E-2-125-SP 60.000 – 80.000
EHAZ-F-2-200-SP 80.000 – 150.000
EHAZ-G-2-125-SP 150.000 – 360.000
EHAZ-H-4-SP 350.000 – 1.000.000
EHAZ single-acting  / spring-return
EHAZ-A-1-50-SR-SP 20 – 150
EHAZ-B-1-63-SR-SP 50 – 700
EHAZ-C-1-80-SR-SP 500 – 3.000
EHAZ-D-1-125-SR-SP 3.000 – 15.000
EHAZ-E-1-125-SR-SP 15.000 – 30.000
EHAZ-F-1-125-SR-SP 30.000 – 60.000
EHAZ-G-1-160-SR-SP 50.000 – 100.000
EHAZ-H-2-160-SR-SP 1.000.000
EHAZ-I-2-200-SR-SP 500.000 – 1.000.000