IM-P713-01 CTLS Issue 1
11
AEL7 Series Electric actuator
2.3 Operating principle
The AEL7 Series is a range of linear electric actuators of various voltages and thrusts suitable for the
modulation of Spirax Sarco Group valves either by means of VMD or modulating signal. Independent of the
control method, the actuators typically uses two physical force dependent (torque) switches to determine
the end position of the actuator stroke in both directions and stop the actuator motor i.e. uses the end stops
within the valve in order to determine stroke. The force dependent switches do not require any adjustment
to correspond to valves with different lengths of stroke.
The potentiometer and positioner card (when fitted) are set to a predetermined stroke at the factory. This
can be adjusted locally in order to suit the respective valve and provide optimum position control or feedback.
Torque Switch (DE) – Actuator Extend
Torque Switch Cam
Torque Switch (DE) – Actuator Retract
Fig. 2
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