Patent ID: 8262057

Claim:
An apparatus comprising: a housing assembly having an internal chamber, a fluid inlet in fluid communication with the internal chamber, and an actuator stem extending from the housing assembly, wherein the actuator stem is moveable in response to the addition or removal of a fluid into or out of the internal chamber; and a fluid control valve in fluid communication with the fluid inlet of the housing assembly, wherein the fluid control valve comprises a movable flow control element having an aperture therethrough, wherein the movable flow control element is to move between a first position against a first sealing surface at which fluid flows from the fluid inlet to the internal chamber through the aperture at a first flow rate and a second position against a second sealing surface opposite the first sealing surface at which fluid flows from the internal chamber to the fluid inlet adjacent an outer surface of the flow control element and through two or more apertures of the second sealing surface at second flow rate, wherein the second flow rate is substantially greater than the first flow rate.