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A split control unit in a distributed flow unit includes a flow inlet configured to receive a fuel flow, a first manifold having flow lines to supply fuel to one or more primary nozzles, and a second manifold having flow lines to supply fuel to one or more secondary nozzles. In an embodiment, the se

A split control unit in a distributed flow unit includes a flow inlet configured to receive a fuel flow, a first manifold having flow lines to supply fuel to one or more primary nozzles, and a second manifold having flow lines to supply fuel to one or more secondary nozzles. In an embodiment, the second manifold is in fluid communication with the flow inlet. A metering valve has a first port in fluid communication with the flow inlet and with the second manifold. The metering valve is configured to supply a metered fuel flow to the first manifold. A flow passage is in fluid communication with, and runs between, a flow line of the first manifold and a flow line of the second manifold to allow for a continuous cooling flow in the second manifold when all of the one or more secondary nozzles are closed.

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1. A split control unit to provide a continuous cooling flow in a distributed flow system, the split control unit comprising: a flow inlet configured to receive a fuel flow;a first manifold having flow lines to supply fuel to one or more primary nozzles;a second manifold having flow lines to supply

1. A split control unit to provide a continuous cooling flow in a distributed flow system, the split control unit comprising: a flow inlet configured to receive a fuel flow;a first manifold having flow lines to supply fuel to one or more primary nozzles;a second manifold having flow lines to supply fuel to one or more secondary nozzles, the second manifold in fluid communication with the flow inlet;a metering valve having a first port in fluid communication with the flow inlet and with the second manifold, the metering valve configured to supply a metered fuel flow to the first manifold; anda flow passage in fluid communication with, and running between, a flow line of the first manifold and a flow line of the second manifolds to allow for a continuous cooling flow in the second manifold when all of the one or more secondary nozzles are closed. 2. The split control unit of claim 1, further comprising a throttling valve disposed between a second port on the metering valve and the first manifold, the throttling valve configured to maintain a relatively constant pressure drop across the first and second ports of the metering valve. 3. The split control unit of claim 2, wherein the throttling valve has a first port in fluid communication with the second port of the metering valve, and a second port in fluid communication with the flow inlet. 4. The split control unit of claim 2, wherein the metering valve includes an enrichment port in fluid communication with the throttling valve, and with a third manifold having one or more non-enriched primary nozzles. 5. The split control unit of claim 4, wherein the one or more primary nozzles of the first manifold comprise enriched primary nozzles to which fuel is supplied via the throttling valve, and wherein the enriched primary nozzles receive a greater fuel flow than the non-enriched primary nozzles. 6. The split control unit of claim 1, further comprising a valve controller configured to control the metering valve. 7. The split control unit of claim 6, wherein the valve controller comprises an electro-hydraulic servo-valve controller with two flow lines in fluid communication with two respective ports located at either end of the metering valve, and wherein the pressure differential between the two respective ports determines the position of a metering valve piston. 8. The split control unit of claim 1, wherein the one or more primary nozzles comprises a plurality of primary nozzles, and the one or more secondary nozzles comprises an equal plurality of secondary nozzles, and further comprising one or more flow passages, wherein each of the one or more flow passages is in fluid communication with a flow line for a primary nozzle, and also in fluid communication with a flow line for a secondary nozzle. 9. The split control unit of claim 1, wherein the metering valve and the throttling valve operate to maintain a higher pressure in the second manifold than in the first manifold, when all of the one or more secondary nozzles are closed. 10. A method of providing a continuous cooling flow in a fuel flow distribution system, the method comprising the steps of: providing a first manifold with flow lines to supply fuel to one or more primary nozzles;providing a second manifold with flow lines to supply fuel to one or more secondary nozzles; andconstructing a flow passage between the flow lines of the first and second manifolds, the flow passage configured to allow for a cooling flow in the second manifold when the one or more secondary nozzles are closed. 11. The method of claim 10, further comprising the step of maintaining a pressure differential between the first and second manifolds when the one or more secondary nozzles are closed. 12. The method of claim 11, wherein maintaining a pressure differential between the first and second manifolds when the one or more secondary nozzles are closed comprises maintaining a pressure differential between the first and second manifolds using a metering valve and throttling valve, the metering and throttling valves also regulating fuel flow to the first manifold. 13. The method of claim 12, further comprising the step of configuring the throttling valve to maintain a predetermined pressure drop across first and second ports of the metering valve when the one or more primary nozzles and the one or more secondary nozzles are open. 14. The method of claim 12, further comprising the step of controlling the metering valve using an electro-hydraulic servo-valve. 15. The method of claim 12, further comprising the step of operating the throttling valve such that its regulating port is fully open when the one or more secondary nozzles are closed. 16. The method of claim 12, further comprising the step of providing a flow inlet in fluid communication with the metering port and with the second manifold. 17. The method of claim 10, wherein providing a first manifold with flow lines to supply fuel to one or more primary nozzles comprises providing a first manifold with flow lines to supply fuel to one or more enriched primary nozzles, and providing a third manifold with flow lines to one or more non-enriched primary nozzles. 18. The method of claim 17, further comprising the step of supplying fuel to the non-enriched primary nozzles from a flow line in fluid communication with an enrichment port of a metering valve. 19. The method of claim 17, further comprising the step of supplying fuel to the enriched primary nozzles from a flow line in fluid communications with a throttling valve. 20. A split flow control unit, comprising: a flow inlet configured to receive a total fuel flow at a first pressure;a metering valve with an inlet connected to the flow inlet wherein the metering valve meters a first portion of the total fuel flow from the flow inlet to an outlet of the metering valve at a second pressure less than the first pressure;a throttling valve connected downstream from, and in fluid communication with, the outlet of the metering valve to sense the second pressure, the throttling valve also connected downstream from, and in fluid communication with, the flow inlet to sense the first pressure, wherein the throttling valve is movable in response to a pressure differential between the first and the second pressures to provide an output flow of the first portion of the total fuel flow at a third pressure, the third pressure less than the first pressure;a first manifold connected to the throttling valve to receive the first portion of total fuel flow at the third pressure;a second manifold connected to the flow inlet to receive a second portion of the total fuel flow at the first pressure; anda flow passage connecting the second manifold to the first manifold such that a flow of fuel is permitted from the second manifold at the first pressure to the first manifold at the third pressure.