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6 TORQUE LIMITING DEVICE
6.1 Torque limiter operation
The actuator is protected by a torque limiting device in case of over-
torque.
4 – Closing direction torque scale
3 – Opening direction torque scale
2 – Counterclockwise direction cam
1 – Clockwise direction cam
The torque limiter is triggered as cams (1) or (2) trigger their
corresponding switches when rotating.
The torque limiter is fitted with 2 scale disks (3) and (4) to adjust
the torque limits for both directions. They have torque graduations
from 40 to 100% of the maximum torque deliverable by the actuator.
The torque limiter provides a maintained contact.
If the actuator stops in a position which is not the one required,
please check that:
• The valve stem is clean and well lubricated.
• The valve stem does not jam in the nut.
• The valve stuffing box is not too tight.
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