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A pump arrangement and method of regulating pressure of a pump arrangement are provided. The pump arrangement includes an actuation pump, a pressure regulating valve, and a control valve. The actuation pump has an actuation pump outlet providing an actuation pump discharge flow. The actuation pump d

A pump arrangement and method of regulating pressure of a pump arrangement are provided. The pump arrangement includes an actuation pump, a pressure regulating valve, and a control valve. The actuation pump has an actuation pump outlet providing an actuation pump discharge flow. The actuation pump discharge flow is piped to opposite sides of a regulator valve member that selectively adjusts an amount of fluid that is bled from the actuation pump outlet such that the actuation pump outlet pressure is used to regulate the actuation pump discharge pressure. The actuation pump discharge flow is separated into first and second portions to provide opposing forces on the regulator valve member. The control valve is operably interposed between the actuation pump outlet and the valve member to selectively adjusts the amount of biasing applied by the second portion of the actuation pump discharge flow on the regulator valve member.

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1. A pump arrangement for a fuel system for use in an aircraft, the pump arrangement comprising: an actuation pump having an actuation pump outlet having an actuation pump discharge flow at an actuation pump discharge pressure;a pressure regulating valve comprising: first, second and third ports;a r

1. A pump arrangement for a fuel system for use in an aircraft, the pump arrangement comprising: an actuation pump having an actuation pump outlet having an actuation pump discharge flow at an actuation pump discharge pressure;a pressure regulating valve comprising: first, second and third ports;a regulator valve member selectively adjusting a flow path from the first port to the second port;wherein the first port is operably fluidly coupled to the actuation pump outlet such that a first portion of the actuation pump discharge flow operably biases the regulator valve member in a first direction;wherein the third port is operably fluidly coupled to the actuation pump outlet such that a second portion of the actuation pump discharge flow operably biases the regulator valve member in a second direction opposite the first direction;wherein movement of the regulator valve in either of the first or second directions operably adjusts a pressure of the first portion of the actuation pump discharge flow to correspondingly adjust the actuation pump discharge pressure; anda control valve operably interposed between the actuation pump outlet and the third port selectively adjusting the amount of biasing applied by the second portion of the actuation pump discharge flow. 2. The pump arrangement of claim 1, wherein the control valve includes a control valve inlet operably fluidly communicating with the third port;a control valve outlet operably fluidly communicating with a control pressure source; anda control valve member interposed between the control valve inlet and the control valve outlet adjusting the amount of restriction between the control valve inlet and the control valve outlet to adjust the amount of biasing applied by the second portion of the actuation pump discharge flow. 3. The pump arrangement of claim 2, wherein control valve member controls the amount of the second portion of the actuation pump discharge flow that is permitted to flow to the control pressure source to adjust the amount of biasing applied by the second portion of the actuation pump discharge flow. 4. The pump arrangement of claim 3, wherein the control pressure source is operably fluidly coupled to a low pressure source. 5. A pump arrangement for a fuel system for use in an aircraft, the pump arrangement comprising: an actuation pump having an actuation pump outlet having an actuation pump discharge flow at an actuation pump discharge pressure;a pressure regulating valve comprising: first, second and third ports;a regular valve member selectively adjusting a flow path from the first port to the second port;wherein the first port is operably fluidly coupled to the actuation pump outlet such that a first portion of the actuation pump discharge flow operably biases the regulator valve member in a first direction;wherein the third port is operably fluidly coupled to the actuation pump outlet such that a second portion of the actuation pump discharge flow operably biases the regulator valve member in a second direction opposite the first direction;wherein movement of the regulator valve in either of the first or second directions operably adjusts a pressure of the first portion of the actuation pump discharge flow to correspondingly adjust the actuation pump discharge pressure;a control valve operably interposed between the actuation pump outlet and the third port selectively adjusting the amount of biasing applied by the second portion of the actuation pump discharge flow;wherein the control valve includes a control valve inlet operably fluidly communicating with the third port;a control valve outlet operably fluidly communicating with a control pressure source; anda control valve member interposed between the control valve inlet and the control valve outlet adjusting the amount of restriction between the control valve inlet and the control valve outlet to adjust the amount of biasing applied by the second portion of the actuation pump discharge flow;a sharing valve operably fluidly coupled to the actuation pump outlet;a main pump having a main pump outlet fluidly coupled to the sharing valve; andwherein the sharing valve is the control pressure source, and the sharing valve has a first pressure regulating configuration operably fluidly coupling the control valve outlet to a low pressure source and a second pressure regulating configuration operably fluidly coupling the control valve outlet to the main pump outlet. 6. The pump arrangement of claim 5, wherein the sharing valve has a first flow sharing configuration wherein the sharing valve operably combines the actuation pump discharge flow with a main pump discharge flow to provide a combined flow, and a second flow sharing configuration wherein the sharing valve operably isolates the actuation pump discharge flow from the main pump discharge flow. 7. The pump arrangement of claim 6, wherein the sharing valve is in the second pressure regulating configuration when the sharing valve is in the first flow sharing configuration. 8. The pump arrangement of claim 6, wherein the first portion of the actuation pump discharge flow acts on a first portion of the regulator valve member having a first effective surface area that is greater than a second effective surface area of a second portion of the regulator valve member upon which the second portion of the actuation pump discharge flow acts. 9. The pump arrangement of claim 8, wherein the first effective surface area is between about five percent and fifteen percent greater than the second effective area and further comprising a biasing member acting on the regulator valve member in the second direction, wherein the biasing member provides a biasing force of between about five percent and fifteen percent of a maximum actuation pump discharge pressure. 10. The pump arrangement of claim 9, further comprising a flow restriction interposed between the actuation pump outlet and the third port providing a pressure drop in the second portion of the actuation pump discharge pressure to an intermediate pressure, the control valve operably interposed between the flow restriction and the third port. 11. The pump arrangement of claim 9, wherein the actuation pump is a variable displacement pump and the pressure regulating valve operably controls a displacement controller coupled to the actuation pump; the pressure regulating valve further comprising first, second and third displacement regulating ports, the first displacement regulating port operably coupled to the actuation pump discharge, the second displacement regulating port operably fluidly coupled to the low pressure source, the third displacement regulating port operably fluidly coupled to the displacement controller for providing a displacement control pressure that acts on a first side of a piston of the displacement controller for controlling the displacement controller due to changes in the displacement control pressure in the third displacement regulating port acting on the first side of the piston;the regulator valve member movable between a first position wherein the regulator valve member operably couples the first displacement regulating port with the third displacement regulating port to increase the displacement control pressure, a second position wherein the regulator valve member operably couples the second displacement regulating port with the third displacement regulating port to decrease the displacement control pressure, and a third position wherein the regulator valve member does not couple the third displacement regulating port with either the first or second regulating ports so as to maintain a constant displacement control pressure acting on the first side of the piston; andwherein movement in the first direction reduces the actuation pump displacement and movement in the second direction increases the actuation pump displacement. 12. The pump arrangement of claim 11, wherein the pressure regulating valve further comprises first, second and third reference pressure ports, the first reference pressure port operably coupled to the actuation pump outlet, the second reference pressure port operably fluidly coupled to the low pressure source, the third reference pressure port operably fluidly coupled to the displacement controller for providing a reference pressure that acts on a second, opposite, side of the piston of the displacement controller opposing the force provided by the displacement control pressure acting on the first side of the piston; the regulator valve member operably coupling the first reference pressure port with the third reference port to increase the reference pressure in the second position, the regulator valve member operably coupling the second displacement regulating port with the third displacement regulating port to decrease the reference pressure in the first position, and the regulator valve member does not couple the third reference pressure port with either the first or second reference pressure ports so as to maintain a constant reference pressure acting on the second side of the piston. 13. The pump arrangement of claim 12, wherein the first, second and third displacement regulating ports cooperate with a second stage of the regulator valve member and the first, second and third reference pressure ports cooperate with a third stage of the regulator valve member. 14. A pump arrangement for a fuel system for use in an aircraft, the pump arrangement comprising: an actuation pump having an actuation pump outlet having an actuation pump discharge flow at an actuation pump discharge pressure;a pressure regulating valve comprising: first, second and third ports;a regulator valve member selectively adjusting a flow path from the first port to the second port;wherein the first port is operably fluidly coupled to the actuation pump outlet such that a first portion of the actuation pump discharge flow operably biases the regulator valve member in a first direction;wherein the third port is operably fluidly coupled to the actuation pump outlet such that a second portion of the actuation pump discharge flow operably biases the regulator valve member in a second direction opposite the first direction;wherein movement of the regulator valve in either of the first or second directions operably adjusts a pressure of the first portion of the actuation pump discharge flow to correspondingly adjust the actuation pump discharge pressure;a control valve operably interposed between the actuation pump outlet and the third port selectively adjusting the amount of biasing applied by the second portion of the actuation pump discharge flow;wherein the control valve includes a control valve inlet operably fluidly communicating with the third port;a control valve outlet operably fluidly communicating with a control pressure source; anda control valve member interposed between the control valve inlet and the control valve outlet adjusting the amount of restriction between the control valve inlet and the control valve outlet to adjust the amount of biasing applied by the second portion of the actuation pump discharge flow;wherein the control valve member controls the amount of the second portion of the actuation pump discharge flow that is permitted to flow to the control pressure source to adjust the amount of biasing applied the second portion of the actuation pump discharge flow; andwherein the control valve is a three position valve movable between three discrete positions, the control valve including a second control valve outlet, the control valve having a first position preventing fluid communication between the control valve inlet and the first and second control valve outlets, a second position preventing fluid communication between the control valve inlet and the first control valve outlet and permitting fluid communication between the control valve inlet and the second control valve outlet and a third position permitting fluid communication between the control valve inlet and the first control valve outlet, the second control valve outlet being in fluid communication with the control pressure source and including a pressure increasing restriction to maintain a pressure at the control valve inlet at a higher pressure than that which would similarly be provided by the first control valve outlet. 15. The pump arrangement of claim 14, wherein the first portion of the actuation pump discharge flow acts on a first portion of the regulator valve member having a first effective surface area that is greater than a second effective surface area of a second portion of the regulator valve member upon which the second portion of the actuation pump discharge flow acts. 16. A pump arrangement for a fuel system for use in an aircraft, the pump arrangement comprising: an actuation pump having an actuation pump outlet having an actuation pump discharge flow at an actuation pump discharge pressure;a pressure regulating valve comprising: first, second and third ports;a regulator valve member selectively adjusting a flow path from the first port to the second port;wherein the first port is operably fluidly coupled to the actuation pump outlet such that a first portion of the actuation pump discharge flow operably biases the regulator valve member in a first direction;wherein the third port is operably fluidly coupled to the actuation pump outlet such that a second portion of the actuation pump discharge flow operably biases the regulator valve member in a second direction opposite the first direction;wherein movement of the regulator valve in either of the first or second directions operably adjusts a pressure of the first portion of the actuation pump discharge flow to correspondingly adjust the actuation pump discharge pressure;a control valve operably interposed between the actuation pump outlet and the third port selectively adjusting the amount of biasing applied by the second portion of the actuation pump discharge flow; andwherein the actuation pump is a fixed displacement pump and movement of the regulator valve member in the first direction decreases a flow restriction between the first and second ports to decrease the pressure of the first portion of the actuation pump discharge flow to reduce the actuation pump discharge pressure and movement of the regulator valve member in the second direction increases the flow restriction between the first and second ports to increase the pressure of the first portion of the actuation pump discharge flow to increase the actuation pump discharge pressure. 17. The pump arrangement of claim 16, wherein the actuation pump is a variable displacement pump and movement of the regulator valve member in the first direction operably decreases the amount of displacement of the actuation pump to reduce the actuation pump discharge pressure and movement of the regulator valve member in the second direction increases the amount of displacement of the actuation pump to increase the actuation pump discharge pressure. 18. The pump arrangement of claim 16, wherein the actuation pump is a variable displacement pump and the pressure regulating valve operably controls a displacement controller coupled to the actuation pump; the pressure regulating valve further comprising first, second and third displacement regulating ports, the first displacement regulating port operably coupled to the actuation pump outlet, the second displacement regulating port operably fluidly coupled to a low pressure source, the third displacement regulating port operably fluidly coupled to the displacement controller for providing a displacement control pressure that acts on a first side of a piston of the displacement controller for controlling the displacement controller due to changes in the displacement control pressure in the third displacement regulating port acting on the first side of the piston;the regulator valve member movable between a first position wherein the regulator valve member operably couples the first displacement regulating port with the third displacement regulating port to increase the displacement control pressure, a second position wherein the regulator valve member operably couples the second displacement regulating port with the third displacement regulating port to decrease the displacement control pressure, and a third position wherein the regulator valve member does not couple the third displacement regulating port with either the first or second regulating ports so as to maintain a constant displacement control pressure acting on the first side of the piston; andwherein movement in the first direction reduces the actuation pump displacement and movement in the second direction increases the actuation pump displacement. 19. The pump arrangement of claim 18, wherein the pressure regulating valve further comprises first, second and third reference pressure ports, the first reference pressure port operably coupled to the actuation pump outlet, the second reference pressure port operably fluidly coupled to the low pressure source, the third reference pressure port operably fluidly coupled to the displacement controller for providing a reference pressure that acts on a second, opposite, side of the piston of the displacement controller opposing the force provided by the displacement control pressure acting on the first side of the piston; the regulator valve member operably coupling the first reference pressure port with the third reference port to increase the reference pressure in the second position, the regulator valve member operably coupling the second displacement regulating port with the third displacement regulating port to decrease the reference pressure in the first position, and the regulator valve member does not couple the third reference pressure port with either the first or second reference pressure ports so as to maintain a constant reference pressure acting on the second side of the piston. 20. A method of regulating an output of an actuation pump in a fuel system, the method comprising the steps of: biasing a valve member in a first direction using the actuation pump discharge flow of an actuation pump by applying the actuation pump discharge flow to a first portion of the valve member;biasing the valve member in a second direction, opposite the first direction, using the actuation pump discharge flow of the actuation pump by applying the actuation pump discharge flow to a second portion of the valve member; andselective adjusting the biasing in the second direction applied by the actuation pump discharge flow to the second portion of the valve member to transition the valve member in either the first or second directions;wherein biasing of the valve member in the first direction operably reduces actuation pump discharge pressure and biasing of the valve member in the second direction operably increases actuation pump discharge pressure;wherein the step of biasing in the first direction includes operatively applying a first portion of an actuation pump discharge flow to the first portion of the valve member and the step of biasing in the second direction includes operatively applying a second portion of the actuation pump discharge flow to the second portion of the valve member and wherein the step of selectively adjusting the amount of the actuation pump discharge pressure applied to the second portion of the valve member includes selectively adjusting a reference pressure applied to the second portion of the actuation pump discharge flow that biases the second portion of the valve member; andwherein transitioning of the valve member in the first direction increasingly opens a flow path through which the first portion of the actuation pump discharge flow passes between the actuation pump outlet and a low pressure source decreasing a flow restriction between the actuation pump outlet and the low pressure source thereby reducing the actuation pump discharge pressure and transitioning of the valve member in the second direction increasingly closes the flow path between the actuation pump discharge and the low pressure source increasing the flow restriction between the actuation pump discharge and the low pressure source thereby increasing the actuation pump discharge pressure. 21. The method of claim 20, wherein the fuel system further includes a main pump and a sharing valve, the sharing valve operably selectively coupling the actuation pump discharge flow with a main pump discharge flow to form a combined flow, wherein the step of adjusting the reference pressure applied to the second portion of the actuation pump discharge flow includes the step of switching between a low pressure source and a high pressure source at a main pump discharge pressure. 22. The method of claim 21, further including the step of adjusting the reference pressure by bleeding off a portion of the second portion of the actuation pump discharge flow to a low pressure source. 23. The method of claim 22, further comprising over-riding the low pressure source with a high pressure source to prevent bleeding off of the second portion of the actuation pump discharge flow to a pressure below the pressure of the high pressure source, and wherein the high pressure source is operatively provided by an output of a main pump of the fuel system. 24. The method of claim 23, further comprising the step of adjusting displacement of the actuation pump by transitioning the valve member in the first and second directions.