Patent ID: 8672056

Claim:
A system for drilling a wellbore, comprising: a rotary steerable system having: a drill collar; a plurality of movable steering pads mounted to the drill collar, the plurality of movable steering pads being hydraulically actuated by a fluid directed through a plurality of ports corresponding with the plurality of movable steering pads; a rotational valve positioned in the drill collar, the rotational valve having a plurality of openings and an additional opening to control flow of the fluid to the plurality of ports for actuating the plurality of movable steering pads, the plurality of openings matching the number of ports; and an electric motor coupled to the rotational valve, the electric motor being controlled to rotate the rotational valve in a manner which controls flow of fluid to desired ports of the plurality of ports, the additional valve opening being located to enable flow through specific ports to specific movable steering pads and the plurality of openings being positioned to enable alignment of the plurality of openings with the plurality of ports to enable simultaneous flow of the fluid to all of the plurality of movable steering pads while the additional valve opening is closed.