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Spring-Return Actuators
The operating principle, as explained here, is applicable for actuators with assembly code
C (direct acting).
•
Applying supply pressure to port A will move the pistons outwards to the
"Open" position of the valve.
•
Venting the supply pressure from port A will cause the springs to move the
pistons inwards to the "Close" position of the valve.
•
For assembly codes W, the operating principle is reversed (reverse acting).
Figure 6
Stroke Movements
Outward Stoke
Inward Stroke
