Safety in a new dimension


The new SEHAZ® Eco is currently the most advanced automation unit. It is the advancement of the thousandfold proven SEHAZ® Eco, which is in use worldwide since 1994 with all leading oil and gas providers to automate their pipeline networks.


The SEHAZ® Eco automation unit is designed for maximum operator safety and combines a compact design with minimal weight of the body.

Figure: Sehaz® Eco // explosion-proof Ex II 2G Ex db eb IIB T5 Gb

Product information

The SEHAZ® Eco has up to four integrated safety systems that ensure 100% availability even in the event of a power failure or separated supply lines. The SEHAZ® Eco automates all 90° valves such as ball valves, butterfly valves and various other valves. Thanks to its special adaptor system the automation unit can be easily mounted on any valve. There is no need for additional supply connections or complex air compressors with long supply lines. The SEHAZ® Eco is approved for use in all potentially explosive atmospheres.


When using the SEHAZ® Eco, the costs for energy, operation, installation and maintenance of your automation application are immediately reduced. Your carbon footprint will improve thanks to the unbeatable low power consumption of our electrohydraulic actuators compared to other actuator concepts.

New features of the SEHAZ® Eco

  • New EasySwitch multifunction switch for easy operation of the unit
  • Optimized hand pump with 50 % more pumping capacity
  • Improved control block, thus ESD function, high pilot or line break detection system (LBCp) can be directly adapted economically
  • New antistatic tank with improved tank form, external level indicator as well as integrated hand pump lever
  • New biodegradable operating media Fahlke Eco Fluid 4870
  • The unit is delivered already pre-filled and in operational state

SEHAZ® 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
  • Pressure-resistant control housing (IP67)
  • Oil tank made of antistatic, impact-resistant PE
  • Integrated motor pump unit: max. 250W
  • Pressure reserve accumulator for up to 3 actuator strokes in case of power failure
  • Emergency actuation via integrated hand pump
  • Integrated EasySwitch multifunction switch (local/remote, open/close, off)
  • Pressure monitoring with system pressure gauge
  • Collective fault message (oil level, motor protection switch, runtime monitoring)
  • Control voltage: Ex II 2G Ex db eb IIB T5 Gb
  • Control voltage: 24V DC / 110V DC / 220V DC // 230V AC
  • Power supply: 24V DC / 110V DC // 115V AC / 230V AC / 400V AC
  • Signalling of the end positions: Open/close, current position (4-20 mA)
  • Actuator/gear protection class: IP68
  • Temperature range: -60°C to +70°C
  • Safety systems: Spring-return, hydraulic pressure accumulator, hand pump, battery backup


  • Functions: Emergency shutdown (ESD) / Safety shutdown unit (SSV) / Regulating
  • Pressure monitoring (high pilot and/or low pilot)
  • Line break detection (LBC, pneumatic or electronic)
  • Partial stroke test (PST)
  • Control on a separate stand
  • Galvanic separation from the cathode-protected pipeline
  • End position signalling for underwater applications (IP68)
  • Profibus DP, Modbus interface or GSM communication via GPRS
  • Oil tank made of stainless steel, mat. 1.4301

Model overview

Type Breakaway torque (Nm)
SEHAZ double-acting
SEHAZ-A-1-50-SP 20 – 200
SEHAZ-B-1-50-SP 50 – 1.000
SEHAZ-C-1-80-SP 500 – 4.500
SEHAZ-D-1-125 4.000 – 25.000
SEHAZ-E-1-125 20.000 – 60.000
SEHAZ single-acting  / spring-return
SEHAZ-A-1-50-SR-SP 20 – 200
SEHAZ-B-1-50-SR-SP 50 – 700
SEHAZ-C-1-80-SR-SP 500 – 3.000
SEHAZ-D-1-125-SR-SP 3.000 – 15.000
 SEHAZ-E-1-125-SR-SP 15.000 – 30.000