E2H90 Series

ESD Valve Rotary Actuator

The E2H90 Electro-Hydraulic Rotary Actuator is designed & engineered for Emergency Shut-Down (ESD) Valve Applications.

electro hydraulic actuator

Compact Self-Contained Electro-Hydraulic Rotary Actuator for ESD Valve Applications

Cowan E2H90 Series Self-Contained Electro-Hydraulic Rotary Valve Actuators are used for industrial process valves where highly reliable, controlled and Emergency Shut-down are required. They are used to automate rotary type valves such as: ball and butterfly valves.

For ESD valve applications that require emergency shutoff valves when no power source is available, we recommend the ZE-ESD module.


  • Torque up to 2,650,000 in-lbs
  • On/Off Service
  • Fail-Last, Fail-Close or Fail-Open
  • Spring-Return configuration available
  • Manual Override is Standard
  • Dual Hydraulic Filtering System: allows ease of maintenance

Independent and Adjustable Open/Close Time

The system flow rate is designed to be 20L/min. For example, the measure ESD time of a size 09 electro-hydraulic actuator is less than three seconds. By independently setting an open/close adjustment valve in the hydraulic control system, the length of time to operate the valve by the actuator can be strictly controlled. For example it can close or open the valve in a natural gas pipeline quickly (less than 10s) to block it, or slowly close (more than 120s) the valve to avoid the water hammer effect in a production oil pipeline.



Isolation, on/off


Double or single acting

Fail system

Hydraulic Accumulators or Springs

Driven by

Accumulators, sized to 2 strokes


200-240 Vac/1 Phase/3 Phase
380-480 Vac/3 Phase
500-690 Vac/3 Phase & Custom

Control panel

Integral or remote

Ambient temperature

(-40 to +70 C)



Classification for hazardous areas

Explosion-proof rating: Ex d IIB/IIC T4


Digital (standard)
Feedback by HART,PROFIT NET,PROFIT BUS (options)


Local, remote and ESD function can be configured
Open and close indication
Program partial stroke test (PST)


Duty cycle S5 (15 min continue service)

Power consumption

Only when recharging accumulators

Movement Lock

Complete after each operation

Manual override

Manual hydraulic pump


Speed control for Open and Close


Horizontal or vertical (ISO, MSS, Custom)

Safety Integrity level

SIL 2 (HFT)=0 ; SIL 3 (HFT>=1)

Valve Compatibility

Our Series E2H90 Self-Contained Electro-hydraulic Rotary Actuator is compatible with any process valve that requires rotary motion.

Learn More About: Valve Types

knife gate valve actuator

Butterfly Valve

gate valve actuator

Plug Valve

Segmented Ball Valve

Trunion Ball Valve

Design and Materials

Roll-over the red circle hotspots for more details: 

electro hydraulic actuator



Integrated Hydraulic Control System




Power & Drive Modules

Quarter turn stroke: -5° to 95° adjustable
The cylinder features dual seals to guarantee zero leakage
Symmetric and canted yokes are available to satisfy various valve torque profiles


Explosion Proof Electronic Control Panel

Configure Valve Actuator