Multi-turn actuators - Tri-State Technical Sales Corp.

Anti-backdrive device
By using an LMS 07.1 – LMS 16.1 anti-backdrive device
both self-locking and self-braking can be achieved. The
retaining or braking torque corresponds to at least the maximum
settable tripping torque of the actuator.
With anti-backdrive devices, the use of expensive brake
motors is no longer required for many applications. The
anti-backdrive device is less expensive, much simpler and
safer to use.
[1]
[2]
[3] [4]
[1] The anti-backdrive device is directly mounted to the output drive of
the actuator.
[2] The actuator with anti-backdrive device can either be directly
mounted to the valve or a valve gearbox, in our example a GK multi-turn
gearbox [3] and a GS part-turn gearbox [4]. In this case, particularly high
retaining or braking torques are available, since only the comparatively
low torques at the gearbox input act upon the anti-backdrive device.
The only exception are small-size gearboxes where the anti-backdrive device
is installed at the gearbox output.
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