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A valve for reducing fluid pressure in a fluid distribution network uses the energy released from the fluid to generate power. The valve includes a housing, a turbine disposed within the housing, a fluid reservoir, and a flow control device operable to generate a turbine inlet flow having a flow vel

A valve for reducing fluid pressure in a fluid distribution network uses the energy released from the fluid to generate power. The valve includes a housing, a turbine disposed within the housing, a fluid reservoir, and a flow control device operable to generate a turbine inlet flow having a flow velocity from an inlet flow having a fluid pressure. The turbine receives the turbine inlet flow, which rotates the turbine to generate power. The fluid reservoir collects the flow of fluid discharged from the turbine and generates a valve discharge flow having a desired fluid pressure that is less than the fluid pressure of the inlet fluid. Thus, the energy from the inlet flow is used to generate power. Furthermore, the power generated by the turbine can be independent of the fluid pressure of the valve discharge flow. Consequently, the valve can provide a consistent reduction in fluid pressure and/or flow rate in a distribution network while the turbine generates power.

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1. A valve for reducing fluid pressure and generating power, the valve comprising:a housing;a flow-control device mounted to the housing and operable to generate a turbine inlet flow having a flow velocity from an inlet flow having a fluid pressure;a turbine disposed within the housing and operable

1. A valve for reducing fluid pressure and generating power, the valve comprising:a housing;a flow-control device mounted to the housing and operable to generate a turbine inlet flow having a flow velocity from an inlet flow having a fluid pressure;a turbine disposed within the housing and operable to receive the turbine inlet flow and rotate to generate power;a valve outlet operable to discharge fluid having a fluid pressure lower than the fluid pressure of the inlet flow; anda flow-control circuit operable to sense the discharged flow from the valve outlet and in response regulate the flow of fluid that the valve outlet discharges. 2. The valve of claim 1 wherein the fluid pressure of the discharged fluid is independent of the amount of power generated from the turbine. 3. The valve of claim 1 wherein the valve includes a flow-control device operable to generate a turbine inlet flow having a cross-sectional area that is less than a cross-sectional area of the inlet flow. 4. The valve of claim 1 wherein the flow control device includes a nozzle operable to generate the turbine inlet flow. 5. The valve of claim 1 wherein:the flow control device includes a nozzle operable to generate the turbine inlet flow; andthe turbine includes a disk having a circumference, a plurality of buckets located on the circumference operable to divert the turbine inlet flow, and a shaft coupled to the disk. 6. The valve of claim 1 wherein:the flow control device includes a nozzle operable to generate the turbine inlet flow; andthe turbine includes a disk having a circumference, a plurality of vanes radially protruding from the circumference operable to divert the turbine inlet flow, and a shaft coupled to the disk. 7. The valve of claim 1 wherein:the flow control device includes a nozzle operable to generate the turbine inlet flow; andthe turbine includes first and second disks spaced apart from each other and a plurality of vanes extending between the disks operable to divert the turbine inlet flow, and a shaft coupled to at least one of the disks. 8. The valve of claim 1 further comprising a fluid reservoir operable to collect the turbine inlet flow after the flow is discharged from the turbine and operable to generate a valve discharge flow having a fluid pressure that is less than the fluid pressure of the inlet flow. 9. The valve of claim 8 wherein the fluid reservoir is disposed in the housing. 10. The valve of claim 8 wherein the fluid pressure of the valve discharge flow is generated by the weight of fluid contained in the fluid reservoir. 11. The valve of claim 1 further comprising a deflector plate operable to regulate the rotational speed of the turbine. 12. The valve of claim 11 wherein the deflector plate is pivotally attached to the housing and operable to divert the turbine inlet flow before the flow reaches the turbine. 13. The valve of claim 1 wherein the flow-control circuit senses the fluid pressure of the fluid discharged from the valve, compares the sensed fluid pressure with a desired fluid pressure and directs the flow-control device to maintain the fluid pressure of the discharged fluid at a desired value. 14. The valve of claim 13 wherein the flow-control circuit uses the inlet flow to direct the flow-control device to maintain the fluid pressure of the discharged fluid at the desired value. 15. The valve of claim 13 wherein the flow-control circuit uses the inlet flow to direct the flow control device to modify the turbine inlet flow, and includes a housing and a diaphragm disposed in the housing that separates the housing into two chambers, wherein the inlet flow pressurizes each chamber and a portion of the inlet flow flows through the control circuit to reduce the pressure in one of the chambers to open the flow-control device. 16. The valve of claim 1 further comprising a pressure control circuit operable to increase and decrease gas pressure in the housing. 17. The valve of claim 1 further comprising a generator coup led to the turbine and operable to generate power. 18. A fluid distribution network comprising:a first conduit operable to distribute fluid having a first pressure;a second conduit operable to distribute fluid having a second pressure that is less than the first pressure; anda valve that is operable to reduce fluid pressure and generate power, and that includes:a housing;a flow-control device mounted to the housing and operable to generate a turbine inlet flow having a flow velocity from fluid in the first conduit;a turbine disposed within the housing and operable to receive the turbine inlet flow and rotate to generate power;a valve outlet operable to discharge fluid having a fluid pressure lower than the fluid pressure of the inlet flow; anda flow-control circuit operable to sense the discharged flow from the valve outlet and in response regulate the flow of fluid that the valve outlet discharges. 19. The network of claim 18 wherein the network includes at least two first conduits and the valve couples the first conduits with the second conduit. 20. The network of claim 18 wherein the network includes at least two second conduits and the valve couples the second conduits with the first conduits. 21. The network of claim 18 wherein the network includes at least two valves that couple the first and second conduits. 22. A method of reducing pressure in a flow of fluid and generating power, the method comprising:generating, with a flow control device, a turbine inlet flow having a flow velocity from an inlet flow having a first pressure;projecting the turbine inlet flow toward a turbine disposed in a housing;diverting the turbine inlet flow with the turbine to rotate the turbine;generating a valve discharge flow having a desired second pressure that is less than the first pressure; andsensing the valve discharge flow generated and in response regulating the valve discharge flow being generated. 23. The method of claim 22 wherein generating the turbine inlet flow includes forcing the inlet flow through a nozzle to generate a turbine inlet flow having a high flow velocity. 24. The method of claim 22 wherein projecting the turbine inlet flow toward a turbine includes projecting the turbine inlet flow between two disks of the turbine. 25. The method of claim 22 wherein diverting the turbine inlet flow includes diverting the turbine inlet flow with a deflection plate before the turbine inlet flow reaches the turbine. 26. The method of claim 22 wherein diverting the turbine inlet flow includes diverting the turbine inlet flow two or more times with the turbine before the turbine inlet flow is collected in the reservoir. 27. The method of claim 22 further comprising collecting the flow discharged from the turbine in a reservoir. 28. The method of claim 22 further comprising generating power from the turbine. 29. The method of claim 22 wherein:sensing the valve discharge flow includes sensing the pressure in the valve discharge flow; andregulating the valve discharge flow includes directing the flow-control device to maintain the fluid pressure of the discharged fluid at a desired value. 30. The method of claim 22 further comprising injecting gas into the housing to increase the second pressure. 31. The method of claim 22 further comprising removing gas from the housing to decrease the second pressure. 32. A method, comprising:converting energy from an input fluid flow having a first pressure into mechanical work;generating an output fluid flow having a second pressure that is less than the first pressure; andmaintaining the second pressure at a desired level by adjusting the input fluid flow in response to the output fluid flow. 33. The method of claim 32 wherein converting energy from the input fluid flow comprises diverting the input fluid flow with a turbine. 34. The method of claim 32 wherein converting energy from the input fluid flow comprises rotating a shaft of an electrical generator with the input fluid flow. 35. The method o f claim 32 wherein generating an output fluid flow having a second pressure comprises maintaining the output fluid flow at the second pressure by adjusting the pressure of a gas within a housing that receives the input fluid flow and that expels the output fluid flow. 36. A valve for reducing fluid pressure and generating power, the valve comprising:a housing;a flow-control device mounted to the housing and operable to generate a turbine inlet flow having a flow velocity from an inlet flow having a fluid pressure;a turbine disposed within the housing and operable to receive the turbine inlet flow and rotate to generate power;a valve outlet operable to discharge fluid having a fluid pressure lower than the fluid pressure of the inlet flow; anda pressure control circuit operable to increase and decrease gas pressure in the housing. 37. The valve of claim 36 wherein the pressure control circuit is operable to increase and decrease gas pressure in the housing to control the rotational speed of the turbine. 38. The valve of claim 36 further comprising a fluid reservoir operable to collect the turbine inlet flow after the flow is discharged from the turbine and operable to generate a valve discharge flow having a fluid pressure that is less than the fluid pressure of the inlet flow. 39. The valve of claim 38 wherein the pressure control circuit adjusts the level of liquid collected in the reservoir to partially submerge the turbine with the liquid. 40. The valve of claim 38 wherein the pressure control circuit adjusts the level of liquid collected in the reservoir to wholly submerge the turbine with the liquid. 41. The valve of claim 38 wherein the fluid pressure of the valve discharge flow is generated by the weight of the liquid contained in the fluid reservoir and the gas pressure in the housing. 42. The valve of claim 38 wherein the pressure control circuit includes a float operable to sense the level of liquid contained in the fluid reservoir, and a control module operable to open a valve to inject gas into the housing and to close a valve to stop injecting gas into the housing. 43. A fluid distribution network comprising:a first conduit operable to distribute fluid having a first pressure;a second conduit operable to distribute fluid having a second pressure that is less than the first pressure; anda valve that is operable to reduce fluid pressure and generate power, and that includes:a housing;a flow-control device mounted to the housing and operable to generate a turbine inlet flow having a flow velocity from fluid in the first conduit;a turbine disposed within the housing and operable to receive the turbine inlet flow and rotate to generate power;a valve outlet operable to discharge fluid having a fluid pressure lower than the fluid pressure of the inlet flow; anda pressure control circuit operable to increase and decrease gas pressure in the housing. 44. A method of reducing pressure in a flow of fluid and generating power, the method comprising:generating, with a flow control device, a turbine inlet flow having a flow velocity from an inlet flow having a first pressure;projecting the turbine inlet flow toward a turbine disposed in a housing;diverting the turbine inlet flow with the turbine to rotate the turbine;generating a valve discharge flow having a desired second pressure that is less than the first pressure; andinjecting gas into the housing to increase the second pressure. 45. The method of claim 44 further comprising collecting the flow discharged from the turbine in a reservoir. 46. The method of claim 45 further comprising:sensing the level of fluid in the reservoir; andinjecting gas into the housing to increase the second pressure when the level of fluid is less than a desired level. 47. A method of reducing pressure in a flow of fluid and generating power, the method comprising:generating, with a flow control device, a turbine inlet flow having a flow velocity from an inlet flow having a first pressure;project ing the turbine inlet flow toward a turbine disposed in a housing;diverting the turbine inlet flow with the turbine to rotate the turbine;generating a valve discharge flow having a desired second pressure that is less than the first pressure; andremoving gas from the housing to decrease the second pressure. 48. The method of claim 47 further comprising collecting the flow discharged from the turbine in a reservoir. 49. The method of claim 48 further comprising:sensing the level of fluid in the reservoir; andremoving gas from the housing to decrease the second pressure when the level of fluid is greater than a desired level.