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A fuel circulation system and methods are provided. The system includes a supply pump for providing an outlet flow of fuel. The system also includes at least a first and a second servo. The first servo is connected to an outlet of the supply pump. A flow regulation device is interposed between the f

A fuel circulation system and methods are provided. The system includes a supply pump for providing an outlet flow of fuel. The system also includes at least a first and a second servo. The first servo is connected to an outlet of the supply pump. A flow regulation device is interposed between the first and second servos. At least a portion of the outlet flow from the supply pump is directed through the first servo, flow regulation device, and second servo and is returned to an inlet of the supply pump.

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1. A fuel circulation system, comprising: a supply pump for providing an outlet flow of fuel:at least a first and a second electro-hydraulic servo valve (EHSV), the first EHSV connected to an outlet of the supply pump, anda flow regulation device interposed between the first and second EHSVs, wherei

1. A fuel circulation system, comprising: a supply pump for providing an outlet flow of fuel:at least a first and a second electro-hydraulic servo valve (EHSV), the first EHSV connected to an outlet of the supply pump, anda flow regulation device interposed between the first and second EHSVs, wherein at least a portion of the outlet flow of fuel is directed through the first and second EHSVs and the flow regulation device and is returned to an inlet side of the supply pump;wherein the first. EHSV, flow regulation device, and second EHSV are connected in series;wherein the flow regulation device is a pressure regulator that regulates an output flow from the first EHSV at a first pressure and provides an output flow to the second EHSV at a second pressure; andwherein the flow regulation device is operable to bypass a portion of the outlet flow from the first EHSV back to the inlet side of the supply pump. 2. A fuel circulation system, comprising: a supply pump for providing an outlet flow of fuel;at least a first and a second electro-hydraulic servo valve (EHSV), the first EHSV connected to an outlet of the supply pump; anda flow regulation device interposed between the first and second EHSVs, wherein at least a portion of the outlet flow of fuel is directed through the first and second EHSVs and the flow regulation device and is returned to an inlet side of the supply pump;wherein the flow regulation device is a combined pressure regulator and switching device operable to change a flow path from the supply pump through the first and second EHSVs between a first and a second flow configuration such that, in the first flow configuration, the first and second EHSVs are arranged in series with one another, and in the second configuration, the first and second EHSVs are arranged in parallel with one another. 3. A fuel circulation system comprising: a supply pump for providing an outlet flow of fuel;a plurality of electro-hydraulic servo valves (EHSVs) arranged in series with one another in a first configuration, wherein a portion of the outlet flow of fuel passes through the plurality of EHSVs and is recirculated to an inlet side of the supply pump; anda EHSV regulator interposed between each adjacent ones of the plurality of EHSVs;wherein the EHSV regulator is a pressure regulator;wherein the pressure regulator regulates an output flow from a first EHSV of the plurality of EHSVs in series with the first EHSV and the pressure regulator at a second pressure; andwherein the pressure regulator bypasses a portion of the output flow from the first EHSV back to the inlet side of the supply pump. 4. The fuel circulation system of claim 3, wherein the second EHSV provides an output flow to the inlet side of the supply pump. 5. A fuel circulation system comprising: a supply pump for providing an outlet flow of fuel:a plurality of electro-hydraulic servo valves (EHSVs) arranged in series with one another in a first configuration, wherein a portion of the outlet flow of fuel passes through the plurality of EHSVs and is recirculated to an inlet side of the supply pump; andEHSV regulator interposed between each adjacent ones of the plurality of EHSVs;wherein the EHSV regulator is a combined pressure regulator and flow switching device, andwherein the combined pressure regulator and flow switching device is operable to modify a flow path between a first EHSV of the plurality of EHSVs and a second EHSV of the plurality of EHSVs from the first configuration such that the first EHSV is arranged in parallel relative to the second EHSV. 6. A method for controlling a flow of fuel in a fuel circulation system, the method comprising the steps of: supplying an outlet flow of fuel from a supply pump;providing at least a portion of the outlet flow of fuel to a plurality of electro-hydraulic servo valves EHSVs that, in a first configuration, are arranged in series with one another,regulating a pressure of an outlet flow of a first EHSV of the plurality of EHSVs with a pressure regulator interposed between the first EHSV and a second EHSV of the plurality of EHSVs and regulating a pressure of an inlet flow to the second EHSV with the pressure regulator;bypassing a portion of the outlet flow from the first EHSV back through the pressure regulator back to an inlet side of the supply pump. 7. A method for controlling a flow of fuel in a fuel circulation system, the method comprising the steps of: supplying an outlet flow of fuel from a supply pump;providing at least a portion of the outlet flow of fuel to a plurality of electro-hydraulic servo valves EHSVs that, in a first configuration are arranged in series with one another;modifying a flow path through the plurality of EHSVs such that, in a second configuration, they are arranged in parallel to one another. 8. The method of claim 7, wherein the step of modifying the flow path through the plurality of EHSVs includes modifying the flow path with a combined pressure regulator and flow switching device.