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A valve apparatus for controlling fluid flow between a fluid passage and a fluid delivery conduit therein includes a valve housing having first and second housing ports spaced therealong, and a driven member driveable toward and away from the first housing port. A closure member having a port is cou

A valve apparatus for controlling fluid flow between a fluid passage and a fluid delivery conduit therein includes a valve housing having first and second housing ports spaced therealong, and a driven member driveable toward and away from the first housing port. A closure member having a port is coupled to the driven member and slidable therealong. The driven member and closure member close and open the closure member port during movement of the driven member toward and away from the first port to induce and relieve a pressure differential, exerted on the closure member by fluid entering the housing, acting to slide the closure member along the driven member to close the first housing port. An inductive coil extends about an open end of the housing to receive a coil-equipped end of a probe therein to communicate the probe with monitoring and control systems across the valve.

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The invention claimed is: 1. A valve apparatus arranged for support within a fluid passage to control fluid flow between the fluid passage and a fluid delivery conduit having one end thereof disposed within the fluid passage to facilitate delivery of fluid between an interior and an exterior of the

The invention claimed is: 1. A valve apparatus arranged for support within a fluid passage to control fluid flow between the fluid passage and a fluid delivery conduit having one end thereof disposed within the fluid passage to facilitate delivery of fluid between an interior and an exterior of the fluid passage via a pressure difference between the fluid passage and the fluid delivery conduit, the valve apparatus comprising: a valve housing having an open end and having a first housing port and a second housing port spaced along the valve housing, each housing port communicating with an exterior and interior of the valve housing; a driven member supported within the valve housing; a drive mechanism coupled to the driven member to effect displacement of the driven member along the valve housing toward and away from the first housing port into extended and retracted positions respectively; and a closure member slidably coupled to the driven member to be slidable relative thereto along the valve housing, the closure member having a closure member port communicating with an interior and exterior of the closure member; the driven member and closure member arranged to close and open the closure member port during movement of the driven member toward the extended position and the retracted position respectively to respectively induce and relieve a pressure differential that, when induced, is exerted on the closure member by fluid entering the valve housing to slide the closure member along the driven member to a closed position in which the closure member closes the first housing port; wherein a sealing arrangement associated with the driven and closure members is defined within the valve housing and arranged to first close off the closure member port between the driven member and the closure member under movement of the driven member from the retracted position toward the first housing port relative to the closure member and to subsequently close off the first housing port between the closure member and the valve housing under movement of the closure member toward the first housing port subsequent to closing of the closure member port. 2. The valve apparatus according to claim 1 wherein stops defined between the closure member and the driven member at spaced apart positions therealong limit relative sliding therebetween to establish movement of the driven member and closure member together after a predetermined amount of relative sliding therebetween in a single direction from engagement with either stop. 3. The valve apparatus according to claim 1 comprising a stop defined between the valve housing and the closure member to prevent movement of the closure member past the closed position. 4. The valve apparatus according to claim 1 wherein the sealing arrangement comprises inner annular seals disposed about an external periphery of the driven member at spaced locations therealong to seal against the closure member and outer annular seals disposed about an external periphery of the closure member at spaced locations therealong to seal against the valve housing, the closure member comprising a sleeve disposed about the driven member, movement of the driven member to situate the closure member port between engagement of adjacent inner annular seals between the driven member and the closure member effecting closing of the closure member port and movement of the closure member to situate the first housing port between engagement of adjacent outer annular seals between the closure member and the valve housing effecting closing of the first housing port. 5. The valve apparatus according to claim 1 wherein the closure member port is in fluid communication with the exterior of the valve housing through an opening in a wall of the valve housing with the driven member in the retracted position and the closure member port closed. 6. The valve apparatus according to claim 1 wherein an inner diameter of the valve housing and an outer diameter of the closure member are each stepped to increase in size toward the first housing port to increase a surface area for pressure of the fluid entering the valve housing through the second housing port to act on toward the first housing port with the closure port closed by the driven member. 7. The valve apparatus according to claim 6 wherein the closure member port is in fluid communication with the exterior of the valve housing through an opening in a wall of the valve housing with the driven member in the retracted position and the closure member port closed. 8. The valve apparatus according to claim 1 wherein an inner diameter of the valve housing and an outer diameter of the closure member are each stepped to increase in size away from the first housing port to increase a surface area for pressure of the fluid entering the valve housing through the open end thereof to act toward the first housing port with the closure member port closed by the driven member. 9. The valve apparatus according to claim 8 wherein the driven member has a passage defined therethrough to allow fluid flow from the open end thereof through the driven member to exert pressure toward the first housing port at the surface area with the closure port closed by the driven member. 10. The valve apparatus according to claim 1 in combination with a wellbore and production tubing which respectively define the fluid passage and the fluid delivery conduit, wherein the valve housing is supported within the production tubing for use of the valve apparatus as a shut-in valve for controlling flow of production fluid from the fluid passage defined by the wellbore through the fluid delivery conduit defined by the production tubing. 11. The valve apparatus according to claim 1 in combination with a wellbore and injection tubing which respectively define the fluid passage and the fluid delivery conduit, wherein the valve housing is supported within the injection tubing for use of the valve apparatus as an injection valve for controlling flow of injection fluid into the fluid passage defined by the wellbore through the fluid delivery conduit defined by the injection tubing. 12. The valve apparatus according to claim 1 wherein the driven member is arranged to support the closure member in the closed position with the driven member deployed to the extended position. 13. A valve apparatus arranged for support within a fluid passage to control fluid flow between the fluid passage and a fluid delivery conduit having one end thereof disposed within the fluid passage to facilitate delivery of fluid between an interior and an exterior of the fluid passage via a pressure difference between the fluid passage and the fluid delivery conduit, the valve apparatus comprising: a valve housing having an open end and having a first housing port and a second housing port spaced along the valve housing, each housing port communicating with an exterior and interior of the valve housing with the first housing port being adjacent the open end of the housing and the second housing port being on a side of the first housing port opposite the open end of the valve housing; a driven member supported within the valve housing and comprising a piston displaceable therealong; a drive mechanism coupled to the driven member within the valve housing on a side of the second housing port opposite the first housing port to effect displacement of the driven member along the valve housing toward and away from the first housing port into extended and retracted positions respectively; and a closure member comprising a sleeve disposed about and slidably coupled to the driven member for relative sliding between the closure member and the driven member along the valve housing, the closure member having a closure member port communicating with an interior and exterior of the closure member; an inner diameter of the valve housing changing in size at a step defined between the first and second housing ports and an outer diameter of the closure member changing in size at a corresponding step, the sliding of the closure member along the valve housing moving the steps toward and away from one another to close and open an annular space between the closure member and the valve housing, the step of the closure member increasing a surface area for pressure of the fluid entering the valve housing to act on toward the first housing port with the closure member port closed, closing of the closure member port acting to seal off the annular space from a remainder of the interior of the valve housing to create a pressure differential between the remainder of the housing interior and the annular space which is open to the housing exterior through the second housing port, and opening of the closure member relieving the pressure differential, the pressure differential and the pressure of the fluid acting on the increased surface area acting to slide the closure member along the driven member to a closed position in which the closure member closes the first housing port; driving of the driven member from the retracted position toward the extended position moving the driven member along the surrounding closure member to close off the closure member port to induce sliding of the closure member along the driven member Into the closed position, and driving of the driven member from the extended position toward the retracted position moving the driven member along the surrounding closure member to open the closure member port to facilitate withdrawal of the closure member from the closed position. 14. The valve apparatus according to claim 13 wherein a stop is defined between the closure member and the drive member to engage the closure and drive members for movement together away from the first housing port after sufficient movement of the drive member from the extended position toward the retracted position with the closure member in the closed position to open the closure member port. 15. The valve apparatus according to claim 13 wherein the inner diameter of the valve housing and the outer diameter of the closure member, across the step and the corresponding step respectively, each increase in size toward the first housing port and the increased surface area is defined within the annular space, whereby the pressure exerted on the increased surface area to force the closure member toward the first housing port being is provided by fluid entering the annular space through the second housing port. 16. The valve apparatus according to claim 15 wherein the closure member port is in fluid communication with the exterior of the valve housing through an opening in a wall of the valve housing with the driven member in the retracted position and the closure member port closed. 17. The valve apparatus according to claim 13 wherein the inner diameter of the valve housing and the outer diameter of the closure member, across the step and the corresponding step respectively, each increase in size away from the first housing port and the increased surface area is defined outside the annular space within the remainder of the housing interior on a side of the annular space opposite the first housing port, whereby the pressure that is exerted on the increased surface area to force the closure member toward the first housing port is provided by fluid entering the remainder of the housing interior through the open end of the valve housing, the driven member having a passage defined therethrough to allow the fluid from the open end of the valve housing to reach the increase surface area. 18. A combination of a probe and a down hole valve apparatus arranged for support within a fluid passage to control fluid flow between the fluid passage and a fluid delivery conduit having one end thereof disposed within the fluid passage to facilitate delivery of fluid between an interior and an exterior of the fluid passage via a pressure difference between the fluid passage and the fluid delivery conduit, the valve apparatus comprising: a valve housing having an open end and at least one port communicating with an exterior and interior of the valve housing at a distance from the open end thereof; a valve operating mechanism supported within the valve housing and operable to open and close the at least one port to control fluid flow between the interior of the valve housing and the surrounding fluid passage; an electronic system situated on a side of the valve operating mechanism opposite the open end of the valve housing; and an inductive coil electrically coupled to the electronic system, supported proximate the open end of the valve housing in a fixed position relative thereto and wrapped about an axis thereof; the probe being separate from the valve housing, being movable relative thereto and having a respective inductive coil wrapped about a respective axis of the probe at a respective end thereof for movement of the inductive coil with the probe, the respective end of the probe being sized to fit within the open end of the valve housing to facilitate selective insertion of the respective end of the probe into the interior of the valve housing through the open end thereof to situate the inductive coils proximate one another for inductive energy transfer therebetween. 19. The combination according to claim 18 wherein the electronic system comprises a control system coupled to the valve operating mechanism to control operation thereof in response to signals passed from the probe to the electronic system through the inductive coils. 20. The combination according to claim 18 wherein the electronic system comprises a monitoring system arranged to monitor conditions within the fluid passage and send signals to the probe indicative of the conditions through the inductive coils.