EA31 Non-Spring Return Rotary Actuator

Brand: Eurotherm
Does not ship to United States

The Model EA31 actuator is a non-spring return gear driven crankshaft actuator for two position operation of dampers, valves or other equipment that doesn’t require return to normal position upon power interruption.

The hardened steel crankshaft is driven through a train of precision hobbed gears.

The actuator is driven by a shaded pole motor that is completely submerged in oil and sealed in an aluminum case to assure long life and minimum maintenance.

The gear train of the EA31 crank actuator is also sealed in oil.

Working in conjunction with primary loop controllers, these power units are ideal for On-Off control of valves and dampers.

The EA31 travel time is 30 seconds and its shaft rotation is a unidirectional 180° clockwise stroke from 0° to 180° or clockwise from 180° to 0°.
  • Non-spring return two position operation
  • 220 in-lbs torque - 30 seconds travel
  • Oil immersed motor and gear train
  • Optional NEMA 4
  • Compatible with VB series valves



Ambient Temperature Range

  • -40° to 58° C (-40° to 136° F)

Approvals & Certifications

  • UL (C,US)

Control Functions Characteristics

  • Control Action: 3-Wire, from SPDT Switch, On-Off

Enclosure, Body Material

  • Die Cast Aluminum

Environmental Protection

  • IP66
  • NEMA 4


  • 60 Hz


  • 5 to 95 % Relative Humidity, Non-Condensing


  • 6” (152 mm) Clearance Above Wiring

Mounting Position

  • Valve - Upright with Above Centerline of Valve Body


  • Shaft Rotation: Undirectional Clockwise 180°

Switch Type

  • Auxiliary Switch: SPDT Adjustable


  • 220 In/Lbs, 30 seconds Travel


  • 24-240 Vac
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