Importance

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Abstract

A control device for the position (x) of a valve slide (3), with a d.c. voltage (U.sub.B) operated set point transmitter (11), which produces a set point value (U.sub.w) proportional to the position (w) of a control lever (10) and the operating d.c. voltage (U.sub.B), with an actual value transmitter (15) operated with the same d.c. voltage (U.sub.B) as the set point transmitter (11), which produces an actual value signal (U.sub.x) proportional to the position (x) of the valve slide (3) and the operating d.c. voltage (U.sub.B), the proportionality factors (k.sub.1, k.sub.2) being equal to the dependence of the set point and actual value signals (U.sub.w, U.sub.x) on the position (x) of the valve slide (3) or the position (w) of the control lever (10), respectively, and on the operating d.c. voltage (U.sub.B), and with a regulating device (14) having a comparator (12), which regulating device (14) makes the position (x) of the valve slide (3) follow the position (w) of the control lever (10) in dependence of a difference between the set point signal and the actual value signal (U.sub.w, U.sub.x) detected by the comparator (12). To simplify the embodiment of the control device and to improve its working reliability, the actual value transmitter (15) converts the position (x) of the valve slide (3) touchfree into the actual value signal (U.sub.x).

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