Abstract: A control valve arrangement for a servo-steering mechanism which includes a valve control member responsive to arbitrary steering motions of a steering wheel by executing relative movement with respect to a valve housing. The control member is subdivided into two coupling elements movable relative to each other, which coupling elements are mutually resiliently supported. One of the coupling elements is, in a geared manner, connected to the steering wheel with the other coupling element being provided with four control edges cooperating with corresponding control edges of a valve housing. Two of the control edges control a throttling of two pressure medium connections of one working pressure chamber of the servo-steering mechanism with the other two control edges controlling a throttling of two pressure medium connections of a second working pressure chamber of the servo-steering mechanism.

Abstract: A servo-steering mechanism with a steering nut threadably movably connected with a steering worm and being supported with respect to the working piston of a servomotor to be rotatable and also axially movable by way of compression springs in directions of the steering worm axis. The steering nut is additionally supported in the directions of the steering worm axis with respect to the working piston by way of at least one hydraulic support connected with a hydraulic system of the servomotor of the servo-steering mechanism.