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A dual-supply fluid distribution system includes a first pump having an inlet and an outlet. The first pump is configured to supply a first fluid flow. A second pump has an inlet and an outlet, and is configured to supply a second fluid flow. A check valve is coupled between the first and second pum

A dual-supply fluid distribution system includes a first pump having an inlet and an outlet. The first pump is configured to supply a first fluid flow. A second pump has an inlet and an outlet, and is configured to supply a second fluid flow. A check valve is coupled between the first and second pump outlets. The check valve is configured to combine the second fluid flow with the first fluid. A bypass valve is coupled to the outlet of the first pump. The bypass valve has an integral pilot valve and is configured to permit fluid flow from the pump outlets in excess of the fluid demand to recirculate back to the first and second pump inlets. The bypass valve and integral pilot valve are configured to cause the check valve to open when the flow of fluid through the bypass valve is below a threshold amount.

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1. A dual-supply fluid distribution system configured to operate in a single-supply mode or a dual-supply mode, depending on a fluid flow demand, the dual-supply fluid distribution system comprising: a first pump having an inlet and an outlet, the first pump configured to supply a first flow of flui

1. A dual-supply fluid distribution system configured to operate in a single-supply mode or a dual-supply mode, depending on a fluid flow demand, the dual-supply fluid distribution system comprising: a first pump having an inlet and an outlet, the first pump configured to supply a first flow of fluid;a second pump having an inlet and an outlet, the second pump configured to supply a second flow of fluid;a bypass flow valve coupled to the outlet of the first pump, the bypass flow valve having an integral pilot valve, the bypass flow valve configured to, when at least partially open, permit fluid flow from the pump outlets in excess of the fluid flow demand to recirculate back to the first and second pump inlets; anda pressurizing valve coupled between the outlet of the second pump and the first and second pump inlets, the pressurizing valve being configured to, when at least partially open, permit fluid flow from the second pump outlet to recirculate back to the first and second pump inlets, wherein the pressurizing valve is fluidly coupled to the integral pilot valve by a fluid line, the pressurizing valve being configured to open or close based on a signal pressure transmitted via fluid supplied to the pressurizing valve from the integral pilot valve solely through the fluid line;wherein the integral pilot valve is configured to cause the pressurizing valve to close via fluid supplied to the pressurizing valve from the integral pilot valve through the fluid line when the flow of fluid through the bypass flow valve is below a threshold amount; andwherein the closing of the pressurizing valve is configured to cause the second flow of fluid to combine with the first flow of fluid. 2. The dual-supply fluid distribution system of claim 1, further comprising a metering valve, wherein, in single-supply mode, the flow of fluid from the first pump is supplied to the metering valve, and, in dual-supply mode, the flow of fluid from the first and second pumps is supplied to the metering valve. 3. The dual-supply fluid distribution system of claim 1, further comprising an actuator supply unit, wherein, in single-supply mode, the flow of fluid from the first pump is supplied to the actuator supply unit, and, in dual-supply mode, the flow of fluid from the first and second pumps is supplied to the actuator supply unit, and wherein the actuator supply unit is configured to supply pressurized fluid to a hydraulic system. 4. The dual-supply fluid distribution system of claim 1, wherein the integral pilot valve is configured to, when open, bias the pressurizing valve towards a closed position. 5. The dual-supply fluid distribution system of claim 1, further comprising a check valve that, when at least partially open, is configured to allow the fluid flow from the second pump to combine with the fluid flow from the first pump. 6. The dual-supply fluid distribution system of claim 5, wherein the check valve has a check valve member that is biased towards a closed position by a biasing element, and wherein the biasing element includes a coil spring. 7. The dual-supply fluid distribution system of claim 5, wherein the pressurizing valve, when partially or fully closed, is configured to cause the check valve to open. 8. The dual-supply fluid distribution system of claim 1, wherein the pressurizing valve has a pressurizing valve member that is biased towards a closed position by a biasing element, and wherein the biasing element includes a coil spring. 9. The dual-supply fluid distribution system of claim 1, wherein the bypass flow valve includes a bypass valve member, the bypass valve member having both a large-diameter portion and a small-diameter portion. 10. The dual-supply fluid distribution system of claim 9, wherein the bypass valve member is biased towards a closed position by a biasing element, and wherein the biasing element includes a coil spring. 11. The dual-supply fluid distribution system of claim 9, wherein the bypass valve member also operates as the valve member for the integral pilot valve, and wherein the integral pilot valve is configured to open as the bypass valve member moves towards the closed position. 12. The dual-supply fluid distribution system of claim 11, wherein the integral pilot valve is open when a pilot valve flow line is aligned with the small-diameter portion of the bypass valve member, and wherein the integral pilot valve is closed when the pilot valve flow line is aligned with the large-diameter portion of the bypass valve member. 13. The dual-supply fluid distribution system of claim 1, wherein the pressurizing valve is configured to open and close gradually to reduce or eliminate the likelihood of flow transients during transitions between single-supply mode and dual-supply mode. 14. The dual-supply fluid distribution system of claim 1, further comprising a high-pressure relief valve configured to relieve pressure at the outlet of the first pump when that pressure exceeds a threshold level. 15. The dual-supply fluid distribution system of claim 14, wherein the high-pressure relief valve is further configured to relieve pressure from a combined output of the first and second pumps when that pressure exceeds the threshold level. 16. The dual-supply fluid distribution system of claim 1, wherein the dual-supply fluid distribution system comprises a dual-supply fuel distribution system for use in an aircraft. 17. A method of supplying fluid at a metered rate comprising: pumping fluid to a metering valve, wherein pumping fluid to a metering valve comprises: supplying fluid to the metering valve from a first pump;supplying fluid to the metering valve from a second pump when a fluid flow demand exceeds that which can be adequately supplied by the first pump alone;sensing the fluid flow demand via an integrated bypass flow valve and pilot valve;biasing a pressurizing valve between open and closed positions, wherein biasing the pressurizing valve towards the closed position causes a flow output from the second pump to be added to a flow output from the first pump, wherein biasing the pressurizing valve between open and closed positions is controlled based on a signal pressure transmitted via fluid supplied to the pressurizing valve from the pilot valve solely through a fluid line between the pilot valve and the pressurizing valve. 18. The method of claim 17, further comprising operating a check valve configured to allow the flow output from the second pump to combine with the flow output from the first pump when the check valve is at least partially open. 19. The method of claim 17, wherein biasing a pressurizing valve comprises biasing the pressurizing valve towards the closed position via a fluid flow from the pilot valve, when the fluid flow demand is sufficiently high. 20. The method of claim 19, wherein biasing the pressurizing valve towards the closed position causes a check valve to gradually open. 21. The method of claim 17, further comprising relieving pressure at an outlet of the first pump when the pressure exceeds a threshold level, wherein relieving pressure comprises coupling a high-pressure relief valve between an inlet and the outlet of the first pump. 22. The method of claim 17, further comprising supplying fluid from a common supply line to an inlet of the first pump and to an inlet of the second pump. 23. The method of claim 17, further comprising pumping fluid to an actuator supply unit, wherein the actuator supply unit is configured to supply fluid to a hydraulic system. 24. The method of claim 23, wherein pumping fluid to an actuator supply unit comprises supplying fluid to the actuator supply unit from the first pump, and further supplying fluid to the actuator supply unit from the second pump when the fluid flow demand exceeds that which can be adequately supplied by the first pump alone. 25. The method of claim 17, wherein sensing the fluid flow demand via an integrated bypass flow valve and pilot valve comprises sensing the level of bypass fluid flow through the bypass flow valve and configuring the pilot valve to open when the bypass fluid flow through the bypass flow valve falls below a threshold level. 26. The method of claim 17, wherein the step of pumping fluid to a metering valve comprises pumping fuel to the metering valve in an aircraft fuel distribution system.