Patent ID: 6782952
Filing Date: 2004-08-31
Classification: E21B

Abstract:
A well tubing valve comprising:(a) a tubular housing (10) having at least one fluid flow aperture (28) through a housing perimeter wall; (b) a fluid flow control element (20) cooperative with said flow aperture (28) for obstructing and permitting a predetermined fluid flow rate through said flow aperture; (c) an actuator (60) proximate of said housing for incrementally translating said control element in a first direction to a selected flow rate position, the actuator comprising a piston within a cylinder; (d) a first fluid supply conduit (54) serving said actuator and wherein fluid is delivered to said actuator through said first fluid supply conduit to bear upon a first end of the piston to displace a predetermined quantity of fluid from the cylinder; and, (e) a second fluid supply conduit (50) for translating said control element along a second direction.