Claims
- 1. A multiple stage pump, comprising:
a first pump in a first stage; a second pump in a second stage; at least one valve upstream from one of the first pump and the second pump in at least one of the first stage and the second stage; and a common branch line connecting the first stage and the second stage to a common hydraulic system.
- 2. The multiple stage pump of claim 1, wherein the at least one valve includes:
a first valve upstream of the first pump in the first stage of the hydraulic system; and a second valve upstream of the second pump in the second stage of the hydraulic system.
- 3. The multiple stage pump of claim 1, further including:
at least another valve in direct line and upstream from the at least one valve; and a valve system associated with the common branch line upstream from the connection of the first stage and the second stage.
- 4. The multiple stage pump of claim 3, wherein
the at least one valve includes:
a first valve upstream of the first pump in the first stage of the hydraulic system; and a second valve upstream of the second pump in the second stage of the hydraulic system; and the at least another valve includes:
a first other valve upstream from the first valve; and a second other valve upstream from the second valve.
- 5. The multiple stage pump of claim 1, wherein the at least one valve includes three valves associated with both the first stage and the second stage.
- 6. The multiple stage pump of claim 1, wherein the at least one valve is one of a control valve, a flow valve, a pressure control valve and an on/off valve.
- 7. The multiple stage pump of claim 1, further comprising
a first check valve associated with the first stage; and a second check valve associated with the second stage, wherein
the first check valve is adapted to ensure that the second pump in the second stage is not running against a low pressure of a valve of the at least one valve associated with the second stage which is in an “off” position, and the second check valve is adapted to ensure that the first pump in the first stage is not running against a low pressure of a valve of the at least one valve associated with the first stage which is in the “off” position.
- 8. A multiple stage pump, comprising:
at least two pumps; and at least two valve means for regulating fluid from the at least two pumps, respectively, the at least two valve means being upstream from the at least two pumps in a respectively same line as the at least two pumps.
- 9. The multiple stage pump of claim 8, further comprising a merged line upstream from the at least two valve means.
- 10. The multiple stage pump of claim 9, wherein the at least two valve means are control valves, flow valves or on/off valves.
- 11. The multiple stage pump of claim 9, wherein the at least two valve means are pressure regulated valves.
- 12. The multiple stage pump of claim 9, wherein the at least two valve means are pressure relief valves.
- 13. The multiple stage pump of claim 9, wherein the at least two valve means are each a set of valves.
- 14. A pumping system adapted for supplying fluid to an injector, comprising:
a multiple stage pumping system having a multitude of pump stages for supplying the fluid to the injector; and a flow control system for providing a linear flow control throughout the multitude of pump stages while preventing pressure peaks, wherein for each pump stage a pressure control valve regulates the on/off function of a multitude of volumes to supply the each pump stage with the fluid.
- 15. The pumping system of claim 14, further comprising a common branch rail associated with the multiple stage pumping for supply the fluid to the injector, wherein
the fluid flow passes a check valve after each pump stage before the fluid flow is combined in the common branch line, the check valves regulate switching without pressure peaks throughout the multiple stage pumping system, and the check valves ensure that an opposite side pump of the multiple stage pumping system is not running against a low pressure of a valve which is in an “off” position.
- 16. The pumping system of claim 15, wherein the control valves are positioned in parallel and in line to respective reservoirs thereby eliminating pressure drops.
- 17. The pumping system of claim 16, wherein a start position of any of the control valves is a closed position to thus provide a fail safe position when any of the control valves fails.
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] The present application claims priority to U.S. provisional application serial No. 60/283,629, filed on Apr. 16, 2001, the entire disclosure which is incorporated herein by reference.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60283629 |
Apr 2001 |
US |
Divisions (1)
|
Number |
Date |
Country |
Parent |
10079489 |
Feb 2002 |
US |
Child |
10631750 |
Aug 2003 |
US |