| 摘要 |
The invention relates to a controller without auxiliary energy for controlling a working fluid flow of a, in particular, technical process system, comprising a control valve and an actuating drive which is designed to actuate the control valve so as to obtain supply power for providing actuating force exclusively from the working fluid flow and/or the working fluid. According to the invention, a magnetic field source is provided, which is coupled to the control valve such that it follows the movement of the control valve, the movement thereof being detected by a magnetic sensor in order to determine the position of the control valve. |
