the EHS & EHD series

ProControl Valve Actuation & Control - specialized in Scotch Yoke Actuators - canted and symmetric scotch yoke mechanism
ProControl Valve Actuation & Control - specialized in Scotch Yoke Actuators - canted and symmetric scotch yoke mechanism


ProControl EHS & EHD series actuators are composed by a SHS or SHD actuator combined with an electro hydraulic power unit.
ProControl electro hydraulic system is suitable for several applications, such as on/off, total modulating service and partial stroke testing.
It can also achieve an ultra-fast fail safe stroke within < 200 MS by means of the special integrated hydraulic discharging system, complete with damping device to absorb the shock in the last part of the stroke.
ProControl can supply central hydraulic units designed to operate any number of actuators/valves from a single control centre.
ProControl’s electro hydraulic actuators give client peace of mind due to the reliability of the product due to complete independence from pipeline pressure as power source.

  • Category:
    Electro-Hydraulic Actuator
  • Type:
    Quarter Turn
  • Download:
    General Catalogue


Standard equipped with following hardware design:

  • Designed for hazardous areas II2G EEx-de IIC T4-T6 according ATEX.
  • Stainless steel HPU cabinets with min. IP65.
  • ATEX certified electric control system.
  • 2 off 2-way solenoid valves with hand operated lever (optional voltages on request).
  • Electric motor pump 400V AC / 3 Phase 50 Hz (optional voltages on request).
  • Typical power range from 1.1 kW up to 4 kW and from 1000 - 3000 turns in single and three phases.
  • Hydraulic hand pump for emergency operation in case of power failure or pressure drop.
  • Pressure control with analogue signal.
  • Safety valve, oil filter, stainless steel oil reservoir.
  • Hydraulic accumulator (bladder or piston type) sized on client demand for numbers of required powerless strokes.
  • Optional: special insulated control station complete with an internal explosion proof heating system to operate in low temperatures and arctic conditions.

Standard equipped with following signals and contacts:

  • ESD Signal “Emergency-Shut-Down”.
  • Remote & Local PST “Partial Stroke Test”.
  • APST “Automatic-Partial-Stroke-Test”.
  • Remote & Local open / Remote & Local close.
  • Pressure alarm (hydraulic pressure is below the minimum allowed value).
  • Voltage alarm (fuse or voltage failure).
  • Oil-Level-Protection (continuous monitoring to protect the motor pump unit against dry-running), pump will stop by this alarm.
  • Electronic pressure transmitter (4-20mA) to allow custom setting of actuator torque output and min/max operating pressure to suit safe valve operation.
  • Position Feedback-Device 4-20 mA and SPDT switches.
  • Optional: free configurable contacts available for individual customer signals.
  • NEW: STEP by STEP Modulating-Service over 4-20 mA analogue signal.
    • All control signals available by 24VDC hardwire and / or via integrated Software-Solution. The technology provides steady accessibility and is monitoring all process required signals.

Programmable Input and output system:

  • Upgradeable digital and analogue I/O’s for multi-flexibility.
  • Bidirectional Ethernet interface.
  • Integrated web-server for web-visualization, auto reset by system error (Watchdog).
  • Suitable to interact with the most common field bus-systems available on the market (ProfiBus, CAN-Bus, ...).


  • Supply pressure up to 350 bar design.
  • Actuator torque output up to 1.000.000 Nm for single acting and up to 2.000.000 Nm for double acting.
  • Spring starting torque up to 600.000 Nm.
  • Spring ending torque up to 400.000 Nm.
  • Standard operating temperature range -30°C / +100°C.
  • Special low temperature application up to -60°C.
  • All ProControl pressure containing parts are designed according to ASME VIII div.1 and EN 13445.
  • All ProControl actuators are designed for 30 years’ service life.



ProControl developed a dedicated technology for valve automation in remote locations or areas where no proper power sources are available.

In particular, it is a photovoltaic system complete with a solar panel to convert solar energy into electricity, a battery pack to store energy for use during periods of darkness or shade and a proper control unit, which provides battery management, monitoring and protection.

The complete system is suitable for applications in hazardous areas.

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