A hydraulic steering system (1) including a hydraulic steering unit (2)
and an auxiliary device (3). Said The steering unit (2) feeds a hydraulic
medium to a steering cylinder (5) according to the movement of a steering
wheel (4). The auxiliary device (3) includes a valve unit (6) and also
feeds a hydraulic medium to the steering cylinder (5) according to the
movement of the steering wheel (4), in order to assist the steering
movement. The hydraulic medium ejected or discharged from the steering
cylinder (5) as a result of the hydraulic medium fed thereinto flows back
into a tank (10) or to a pump (8, 9) through the steering unit (2).