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Civil Engineering

Rolarams Provide Fail Safe Operation of Ventilation Dampers

Application
Failsafe operation of ventilation dampers.

Solution
Power Jacks Rolaram linear actuator with ball screw drive is fitted onto each damper. This Rolaram actuator is a special design with a pre-loaded spring and is fitted with a high temperature brake motor. The internal spring and drive configuration will allow the ram to retract automatically in the event of power failure. Three adjustable limit switch positions are provided and the stroke can be set within allowable 120mm, by adjusting these switches. All components are selected for the appropriate approved temperature requirement. The actuator has a fire test certificate for operation at 250°C for 1 hour.