Quarter Turn


Double-acting and spring return electro-hydraulic solutions for on-off valves on heavy duty services, suitable for high pressure supply. Models available for output toques to 60,000Nm.

Features & Benefits:

  • Manifold build reduces risk of oil leakages, eliminating potential leak paths, improving reliability and vibration resistance
  • Easy setting and maintenance
  • Accumulator ensures instantaneous response to commands. Redundant accumulators are availble on request
  • Poppet type solenoid valves guarantee tight shutoff with improved energy saving
  • Double relief valve and hydraulic filters improve reliability, durability and safety while providing protection to motor and system
  • Limit switch box and PST options available
  • Critical parts manufactured from 316 stainless steel as a standard tp prevent corrosion
    -316 L stainless steel cabinet and oil tank as standard
    -316/316L stainless steel tubing and fittings
  • Hydraulic manual override as standard
  • Local and remote operation as standard
  • Low power consumption
  • Low number of components involved(reduced fail capability)


EHA/EHAS electro-hydraulic actuators use a self-contained power unit to provide operation and control of 1/4 turn valves in on-off applications when the primary power source (instrument air or hydraulic supply) is unavailable.



Safety integrity level
Suitable for use in SIL2 applications

Area classification
(ATEX) - Ex d IIB (T4)

Enclosure standards
(IEC 60529) - IP65

Pressure equipment directive PED 97/23/EC

Machinery directive


Design pressure:
EHA/EHAS 190 barg maximum

Supply medium:
Hydraulic oil

Output torque:
EHA Double acting torque to 60,000 Nm
EHAS spring starting torque up to 35,000Nm
EHAS spring ending torque up to 25,800Nm

Ambient temperature:
Standard range: -20° C to +55° C (-4°F to + 131°F)

Motor Power: 0.25 KW
Motor voltage: 3-phase 400 V AC 50Hz or 60 Hz (single phase and DC available on request)

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Technical Data Sheets


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Certificates, Approvals & Qualifications

PED Module H H1 2019 07 (English)

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