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In hydrostatic steering systems, occasionally, the need arises of exerting large forces as, for example, is the case in steering actuators of articulated dumpers (see Fig. 1) or in rudder actuation on ships. Consequently, linear motors with large bore diameters are required not to exceed system operational pressure limits. Such actuators, whose travel is dependent on the specific application, absorb a quite large flow rate (up to 400 L/min) to respond, within an appropriate time frame, to steering commands. The flow rate, generated by a properly sized feed unit, cannot in full be handled by the hydro-steering (see Fig. 2), as this, beside other aspects, would necessarily imply too large an orbital motor.