Patent ID: 8606463

Claim:
A hydraulic steering system for a vehicle, comprising a first steering member and a second steering member, wherein the first steering member is operationally connected to a first steering valve unit comprising a first steering valve, and wherein a priority valve controls a flow of a hydraulic fluid to one or more steering cylinders which provide for steering of the vehicle in a desired steering direction, wherein the priority valve gives priority to steering with the first steering member over steering with the second steering member, wherein a second steering valve unit is provided comprising a second steering, valve, wherein the priority valve is connected to the second steering valve unit by a hydraulic fluid load line, and the second steering valve is functionally operable in series with a proportional flow control valve with respect to the hydraulic fluid load line, wherein in a first operational mode when the first steering member is not operated the second steering valve and/or the proportional flow control valve are controlled at least by the second steering member and in a second operational mode the second steering valve unit and the first steering valve unit are used simultaneously when the first steering member is operated.