Patent ID: 8469333

Claim:
A valve actuator assembly, comprising: an actuator housing; an actuator piston disposed within the actuator housing, the actuator piston comprising a first port formed through the actuator piston, wherein the actuator piston and the actuator housing, together, define a counter-biasing chamber connected to the first port and a plurality of control chambers; wherein a first control chamber and the counter-biasing chamber are both positioned on the same side relative to the actuator piston; a first pressure control port, connected to the first control chamber, for passing a pressure control signal to the first control chamber and into contact with a surface of the actuator piston; and a valve comprising a second port formed axially through the valve, the second port at least partially aligned with the first port; wherein the valve has a valve face having a surface area that is greater than the surface area of the portion of the actuator piston forming a portion of the counter-biasing chamber.