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An assembly includes a first enclosed flexible pressure chamber. A first extension arm extends from a first endwall of the first enclosed flexible pressure chamber. A second enclosed flexible pressure chamber includes a second extension arm extending from a second endwall of the second enclosed flex

An assembly includes a first enclosed flexible pressure chamber. A first extension arm extends from a first endwall of the first enclosed flexible pressure chamber. A second enclosed flexible pressure chamber includes a second extension arm extending from a second endwall of the second enclosed flexible pressure chamber. A lever arm is disposed on a pivot. A first end of the lever arm is attached to the first extension arm and a second end of the lever arm is attached to the second extension arm. A variable restriction element is connected to the second end of the lever arm.

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1. An assembly comprising: a first enclosed flexible pressure chamber with a first extension arm extending from a first endwall of the first enclosed flexible pressure chamber, wherein the assembly is fluidly connected to a regulating valve with a regulating valve element, wherein the first flexible

1. An assembly comprising: a first enclosed flexible pressure chamber with a first extension arm extending from a first endwall of the first enclosed flexible pressure chamber, wherein the assembly is fluidly connected to a regulating valve with a regulating valve element, wherein the first flexible pressure chamber is fluidly connected to an inlet of the regulating valve;a second enclosed flexible pressure chamber with a second extension arm extending from a second endwall of the second enclosed flexible pressure chamber;a lever arm disposed on a pivot, wherein a first end of the lever arm is attached to the first extension arm, and wherein a second end of the lever arm is attached to the second extension arm; anda variable restriction element connected to the second end of the lever arm. 2. The assembly of claim 1, wherein the variable restriction element comprises: a pintle. 3. The assembly of claim 1, wherein the second flexible pressure chamber is fluidly connected to an outlet of the regulating valve. 4. The assembly of claim 1, wherein the regulating valve is fluidly connected to an anti-icing system for a nacelle inlet of an aircraft engine. 5. The assembly of claim 1, wherein the variable restriction element comprises a pintle, and further comprising: a solenoid valve fluidly connected to the pintle and to a pressure chamber of the regulating valve. 6. The assembly of claim 5, wherein the solenoid valve is electrically connected to a full authority digital engine control of an aircraft. 7. The assembly of claim 5, wherein the regulating valve element comprises: a hole on a first face of the valve element facing the inlet of the regulating valve. 8. The assembly of claim 1, wherein the variable restriction element comprises a pintle, and further comprising: a solenoid valve fluidly connected to the pintle, to a pressure chamber of the regulating valve, and to the inlet of the regulating valve. 9. A method of regulating pressure of a fluid in an assembly, the method comprising: biasing a fluid inlet pressure of a regulating valve, wherein biasing the fluid inlet pressure comprises: receiving fluid in a first flexible pressure chamber;exerting a first force onto the first flexible pressure chamber from the fluid;actuating a lever arm attached to a first extension arm connected to the first flexible pressure chamber;actuating a pintle connected to the lever arm;adjusting an amount of the fluid released into an ambient environment from the assembly;changing a fluid servo pressure within a pressure chamber of the regulating valve;modulating a regulating valve element of the regulating valve; andadjusting a fluid outlet pressure of the fluid flowing out of an outlet of the regulating valve. 10. The method of claim 9, wherein actuating the lever arm further comprises: receiving the outlet pressure in a second flexible pressure chamber;exerting a second force onto the second flexible pressure chamber; andapplying a moment balance to the lever arm about a pivot upon which the lever arm is attached. 11. The method of claim 9, further comprising: biasing the lever arm by adjusting a spring force of a first spring element connected to a first end of the lever arm. 12. The method of claim 9, further comprising: energizing a solenoid valve which actuates a solenoid valve element of the solenoid valve. 13. The method of claim 12, further comprising: controlling the solenoid valve with an electrical signal from a full authority digital engine control. 14. An assembly comprising: a regulating valve with an inlet;a controller fluidly connected to the inlet of the regulating valve, wherein the controller comprises: a first enclosed flexible pressure chamber;a second enclosed flexible pressure chamber fluidly connected to an outlet of the regulating valve;a lever arm disposed on a pivot;a first end of the lever arm, wherein the first end of the lever arm is connected to a first extension arm extending from a first endwall of the first enclosed flexible pressure chamber;a second end of the lever arm, wherein the second end of the lever arm is connected to a second extension arm extending from a second endwall of the second enclosed flexible pressure chamber;a pintle connected to the second end of the lever arm; anda solenoid valve fluidly connected to the pintle and to a pressure chamber of the regulating valve. 15. The assembly of claim 14, wherein the regulating valve is fluidly connected to an anti-icing system for a nacelle inlet of an aircraft engine. 16. The assembly of claim 14, wherein at least one of the first enclosed flexible pressure chamber and the second enclosed flexible pressure chamber comprise: a bellows with rigid endwalls. 17. The assembly of claim 14, wherein the solenoid valve is fluidly connected to the inlet of the regulating valve. 18. The assembly of claim 17, wherein the regulating valve element comprises: a hole on a first face of the valve element facing the inlet of the regulating valve.