Actuating device and method for displacing the actuating device

摘要

An actuating device or displacing a control device, such as a valve, gate valve or other control mechanism, in particular for use in oil or gas production systems, comprises a motor-gear unit (21) and a thread drive (22) which is operable by said motor-gear unit (21) and which comprises at least a threaded spindle (23) and a screw nut (24). The threaded spindle (23) is displaceable in an essentially axial direction so as to displace the control device (2) between a use position (7) and a non-use position (8, 9, 19, 20). To ensure a safe displacement into the non-use position in a simple way and independently of the pressure conditions prevailing between conveying medium and inner medium, the threaded spindle (23) is substantially axially displaceable beyond the use position (7) into a second non-use position (9). The invention also refers to a corresponding method for displacing the actuating device.

主权项

1. A method for displacing an electrical actuating device (1) in motion communication with a control device for controlling the flow of a conveying medium, comprising:
supplying electrical power to the actuating device to controllably displace the control device (2) between at least one use position (7) and a first non-use position (8); in the absence of electrical power supply, automatically displacing the control device (2) and the actuating device (1) into the first non-use position (8) by exerting pressure by means of the conveying medium back towards the first non-use position (8); and displacing the control device (2) and the actuating device (1) beyond the use position into a second non-use position (9) whenever pressure actuation by the conveying medium is carried out with a pressure smaller than a pressure of an inner medium acting in the actuating device (1).