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A valve control system for a wellbore includes a fiber composite actuator functionally coupled to a valve operating member and means for controllably charging an interior of the actuator with fluid under pressure. A valve for a wellbore includes a valve stem and a valve seat associated with a valve

A valve control system for a wellbore includes a fiber composite actuator functionally coupled to a valve operating member and means for controllably charging an interior of the actuator with fluid under pressure. A valve for a wellbore includes a valve stem and a valve seat associated with a valve body. The valve stem and valve seat are configured to enable fluid flow from an inlet port in the valve body to an outlet port in the valve body when the stem is moved from the seat. An axial contraction fiber composite actuator is functionally coupled to the valve stem. The valve includes means for controllably charging an interior of the actuator with fluid under pressure.

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What is claimed is: 1. A valve control system for a wellbore, comprising: a fiber composite actuator functionally coupled to a valve operating member; a plunger disposed in a valve body to controllably charge an interior of the actuator with fluid under pressure; and a mechanism having a spring, a

What is claimed is: 1. A valve control system for a wellbore, comprising: a fiber composite actuator functionally coupled to a valve operating member; a plunger disposed in a valve body to controllably charge an interior of the actuator with fluid under pressure; and a mechanism having a spring, a magnet and a solenoid disposed within the valve body to reciprocate the plunger within the valve body, the spring arranged to transmit its force to the plunger and react its force against the valve body, the magnet arranged to urge the plunger in a selected direction along the interior of the valve body opposed to the direction of the spring force, the solenoid arranged to produce a magnetic field at least one of opposed to and aligned with a magnetic field induced by the magnet. 2. The system of claim 1 wherein the actuator comprises a fiber layer wound at a selected angle with respect to a longitudinal axis of the actuator, the fiber layer disposed in a flexible matrix. 3. The system of claim 2 wherein the selected angle is such that the actuator axially contracts when the interior of the actuator is charged with fluid under pressure. 4. The system of claim 3 wherein the selected angle is about 20 degrees with respect to a longitudinal axis of the actuator. 5. The system of claim 1 further comprising check valves associated with the plunger, the check valves arranged such that reciprocation of the plunger urges fluid into the interior of the actuator. 6. The system of claim 5 wherein one of the check valves and the plunger are configured such that plunger motion along a selected direction opens the one check valve to enable release of fluid from the interior of the actuator. 7. The system of claim 1 wherein the valve operating member comprises a valve stem coupled to one end of the actuator. 8. The system of claim 1 further comprising a pressure compensated reservoir. 9. A valve for a wellbore, comprising: a valve stem and a valve seat associated with a valve body, the valve stem and valve seat configured to enable fluid flow from an inlet port in the valve body to an outlet port in the valve body when the stem is moved from the seat; an axial contraction fiber composite actuator functionally coupled to the valve stem; and a mechanism to controllably charge an interior of the actuator with fluid under pressure. 10. The valve of claim 9 wherein the actuator comprises a fiber layer wound at a selected angle with respect to a longitudinal axis of the actuator, the fiber layer disposed in an elastomer matrix. 11. The valve of claim 10 wherein the selected angle is about 20 degrees with respect to a longitudinal axis of the actuator. 12. The valve of claim 9 wherein the mechanism to controllably charge comprises a plunger disposed in the valve body, and a reciprocating mechanism to reciprocate the plunger within the valve body. 13. The valve of claim 12 wherein the reciprocating mechanism comprises a spring, a magnet and a solenoid disposed within the valve body, the spring arranged to transmit its force to the plunger and react its force against the valve body, the magnet arranged to urge the plunger in a selected direction along the interior of the valve body opposed to the direction of the spring force, the solenoid arranged to produce a magnetic field at least one of opposed to and aligned with a magnetic field induced by the magnet. 14. The valve of claim 12 further comprising check valves associated with the plunger, the check valves arranged such that reciprocation of the plunger urges fluid into the interior of the actuator. 15. The valve of claim 14 wherein one of the check valves and the plunger are configured such that plunger motion along a selected direction opens the one check valve to enable release of fluid from the interior of the actuator. 16. The valve of claim 9 further comprising a pressure compensated reservoir. 17. A wellbore penetrating subsurface Earth formations, comprising: a borehole formed through the formations; a casing disposed in the borehole to a selected depth; a tubing disposed to a selected depth within the casing; and at least one valve disposed in the wellbore at a selected depth; the valve configured to control fluid flow through at least one of the casing and the tubing, the valve including a valve stem and a valve seat associated with a valve body, the valve stem and valve seat configured to enable fluid flow from an inlet port in the valve body to an outlet port in the valve body when the stem is moved from the seat, the valve including an axial contraction fiber composite actuator functionally coupled to the valve stem, the valve including a mechanism that is selectively movable to control charging of an interior of the actuator with fluid under pressure. 18. The wellbore of claim 17 wherein the actuator comprises a fiber layer wound at a selected angle with respect to a longitudinal axis of the actuator, the fiber layer disposed in an elastomer matrix. 19. The wellbore of claim 18 wherein the selected angle is about 20 degrees with respect to a longitudinal axis of the actuator. 20. The wellbore of claim 17 wherein the mechanism comprises a plunger disposed in the valve body. 21. The wellbore of claim 20 further comprising a spring, a magnet and a solenoid disposed within the valve body, the spring arranged to transmit its force to the plunger and react its force against the valve body, the magnet arranged to urge the plunger in a selected direction along the interior of the valve body opposed to the direction of the spring force, the solenoid arranged to produce a magnetic field at least one of opposed to and aligned with a magnetic field induced by the magnet. 22. The wellbore of claim 20 further comprising check valves associated with the plunger, the check valves arranged such that reciprocation of the plunger urges fluid into the interior of the actuator. 23. The wellbore of claim 17 further comprising a pressure compensated reservoir.