Patent ID: 7699071

Claim:
A fluid control system, comprising a choke assembly comprising: a housing having an inlet passage, an axial bore, and a chamber, wherein a portion of the axial bore forms an outlet passage; and a choke member adapted for movement in the housing to control the flow of a fluid from the inlet passage to the outlet passage; a controller to control a closing force applied to the choke member, thereby forcing the choke member toward a closed position, and to control a bias force applied to the choke member, thereby reducing an overpressure required to initiate movement of the choke member from the closed position; a linear motor to apply the closing force and the bias force; wherein the fluid applies a force on one end of the choke member; wherein the bias force and the closing force are applied on an other end of the choke member, wherein the difference in applied forces controls the position of the choke member in the housing.