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1. (WO2010129225) SUBMERSIBLE PUMP HAVING A TWO-STEP CONTROL HYDRAULIC VALVE
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CLAIMS I claim:

1. A hydraulically actuated submersible pump comprising: a pump body; a piston configured to reciprocate between extended and retracted axial positions relative to the pump body; a pump valve deployed in the pump body, the pump valve in fluid communication with a fluid supply, the pump valve having first and second states, the first state supplying fluid operable to move to the piston to the extended position and the second state supplying fluid operable to move the piston to the retracted position; wherein the pump valve comprises first and second components configured to move between corresponding first and second positions in the pump body, the pump valve being in the first state when the first and second components are in the corresponding first positions, the pump valve being in the second state when the first and second components are in the corresponding second positions.

2. The pump of claim 1, wherein the first and second components are configured to be hydraulically actuated between the corresponding first and second positions.

3. The pump of claim 1, wherein the pump valve is configured such that the second component is hydraulically urged towards its first position when the first component is in its first position and the second component is hydraulically urged towards its second position when the first component is in its second position.

4. The pump of claim 1 further comprising: a first stop mechanically coupled with the first component, wherein retraction of the piston to the retracted position engages the first stop and moves the first component to its first position; and a second stop mechanically coupled with the first component, wherein extension of the piston to the extended position engages the second stop and moves the first component to its second position.

5. The pump of claim 1, wherein the first and second components are deployed coaxially with one another and the pump body.

6. A hydraulically actuated submersible pump comprising: a pump body; a piston configured to reciprocate between extended and retracted axial positions relative to the pump body; a pilot spool deployed in the pump body, the pilot spool configured to be hydraulically actuated between corresponding first and second axial positions with respect to the pump body; a main spool deployed in the pump body, the main spool configured to be hydraulically actuated between corresponding first and second axial positions with respect to the pump body; and a fluid supply port in fluid communication with the piston, the fluid operable to extend the piston when the pilot spool and the main spool are in their corresponding first axial positions, the fluid operable to retract the piston when the pilot spool and the main spool are in their corresponding second axial positions.

7. The pump of claim 6, further comprising: an upper stop mechanically coupled with the pilot spool, wherein retraction of the piston to the retracted position engages the upper stop and moves the pilot spool to its first position; and a lower stop mechanically coupled with the pilot spool, wherein extension of the piston to the extended position engages the lower stop and moves the pilot spool to its second position.

8. The pump of claim 6, wherein: the main spool is hydraulically urged towards its first position when the pilot spool is in its first position; and the main spool is hydraulically urged towards the second position when the pilot spool is in the second position.

9. The pump of claim 6, wherein the pilot spool comprises a through bore providing a first fluid passageway between the fluid supply port and the piston.

10. The pump of claim 9, wherein the pilot spool comprises: a first radial port connecting the through bore with a first annular chamber when the pilot spool is in its first position, high pressure fluid in the first annular chamber operative to urge the main spool towards its first position; and a second radial port connecting the through bore with a second annular chamber when the pilot spool is in its second position, high pressure fluid in the second annular chamber operative to urge the main spool towards its second position.

11. The pump of claim 9, wherein the pilot spool comprises a radial port providing a second fluid passageway between the through bore and the piston when the main spool is in its first position.

12. The pump of claim 11, wherein actuation of the main spool to its second position closes the second fluid passageway and opens a third fluid passageway between the piston and a fluid return port.

13. The pump of claim 6, wherein the main spool is deployed radially between and substantially coaxial with the pump body and the pilot spool.

14. A hydraulically actuated submersible pump comprising: a pump body; a piston configured to reciprocate relative to the pump body between extended and retracted axial positions; a pilot spool deployed in the pump body, the pilot spool configured move between corresponding first and second axial positions with respect to the pump body; an upper stop mechanically coupled with the pilot spool, wherein retraction of the piston to the retracted position engages the upper stop and moves the pilot spool to its first position; a lower stop mechanically coupled with the pilot spool, wherein extension of the piston to the extended position engages the lower stop and moves the pilot spool to its second position; a main spool deployed radially between and substantially coaxial with the pump body and the pilot spool, the main spool configured to be hydraulically actuated between corresponding first and second axial positions with respect to the pump body such that the main spool is hydraulically urged towards its first position when the pilot spool is in its first position and the main spool is hydraulically urged towards its second position when the pilot spool is in its second position, and a fluid supply port in fluid communication with the piston, the fluid operable to extend the piston when the pilot spool and the main spool are in their corresponding first axial positions, the fluid operable to retract the piston when the pilot spool and the main spool are in their corresponding second axial positions.

15. The pump of claim 14, wherein the pilot spool comprises a through bore providing a first fluid passageway between the fluid supply and the piston.

16. The pump of claim 15, wherein the pilot spool comprises: a first radial port connecting the through bore with a first annular chamber when the pilot spool is in its first axial position, high pressure fluid in the first annular chamber operative to urge the main spool towards its first axial position; and a second radial port connecting the through bore with a second annular chamber when the pilot spool is in its second axial position, high pressure fluid in the second annular chamber operative to urge the main spool towards its second axial position.

17. The pump of claim 15, wherein the pilot spool comprises a radial port providing a second fluid passageway between the through bore and the piston when the main spool is in its first axial position.

18. The pump of claim 17, wherein actuation of the main spool to its second axial position closes the second fluid passageway and opens a third fluid passageway between the piston and a fluid return port.

19. The pump of claim 15, wherein the pilot spool comprises: a first radial port connecting the through bore with a first annular chamber when the pilot spool is in its first axial position, high pressure fluid in the first annular chamber operative to urge the main spool towards its first axial position; a second radial port connecting the through bore with a second annular chamber when the pilot spool is in its second axial position, high pressure fluid in the second annular chamber operative to urge the main spool towards its second axial position; and a third radial port providing a second fluid passageway between the through bore and the piston when the main spool is in its axial first position; wherein actuation of the main spool to its second axial position closes the second fluid passageway and opens a third fluid passageway between the piston and a fluid return port.