The value of the supplied reference current (IREF) may be adjusted as a function of the adjustable current (I¿EINSTELL?) generated by the second current balancing circuit (53, 54) by means of an adjustment line (28).

When the lowest control current is supplied, the pressure control valve of the damping force adjusting valve (25) is normally open.

A current source (P8) generates an adjusting current (Iin) in accordance with the result of said comparison, said current being fed to an input of the operation amplifier (OP1).

A setting current switching circuit (120) includes a comparator (127) .

A transmitter (10) coupled to a control loop (16) which carries a loop current senses a process variable which is transmitted over the loop (16).

To this end, a chatter compensating stage (22) is integrated along with the customary position regulator (20) inside the wiper device.

Therefore only the control flow passes through the restrictor (35), whereas the main oil flow goes to a steering motor (20) via the by-pass line (50).