ACTUATING DEVICE AND METHOD OF OPERATING AN ACTUATING DEVICE

摘要

An actuating device for displacing a control device, such as a gate valve or other control mechanism, in particular for use in oil or gas production systems, comprises a motor-gear unit (3) and a threaded spindle drive (4), which is operable by said motor-gear unit (3) and which comprises at least a threaded spindle (5) and a screw nut (6), said threaded spindle (5) being displaceable in an essentially axial-direction so as to displace the control device (2) between an advance position (7) and a retracted position (8), and further comprises a position holding means (9) holding the attained position of the threaded spindle (5). To simplify the structural design and the operation of such an actuating device, whereby this actuating device will become less expensive, and whereby the fault-proofness of the system in question will simultaneously be maintained, the position holding means (9) is directly connected to a motor shaft (10) of the motor-gear unit (3) so as to apply a holding torque to said motor shaft (10). Also a corresponding method of operating an actuating device is disclosed.