Inlet controlled regulating valve

1. A valve comprising:

a restricting element comprising a valve stem and a valve disc coupled together;

a valve body defining a pressure chamber,

wherein the valve body defines a flow path from a high pressure side of the valve to a low pressure side of the valve;

one or more valves in fluid communication with the pressure chamber,

wherein the one or more valves are configured to enable a liquid having a fluid energy to flow to the pressure chamber;

a diaphragm configured to position the restricting element using a first portion of the fluid energy,

wherein the diaphragm is configured to move the restricting element based on a pressure of a fluid in the flow path; and

an energy accumulator configured to generate stored energy using a second portion of the fluid energy,

wherein the energy accumulator is configured to establish a gas-fluid interface between the liquid and a gas in the energy accumulator,

wherein the pressure chamber is configured to deliver the first portion of the fluid energy to the diaphragm,

wherein the pressure chamber is configured to deliver the second portion of the fluid energy to the energy accumulator,

wherein the energy accumulator is configured to exert a pressure on the liquid in the pressure chamber, and

wherein the diaphragm is configured to adjust the position of the restricting element when the energy accumulator exerts the pressure on the liquid in the pressure chamber and the pressure chamber is fluidly isolated from the flow path by the one or more valves.

2. The valve of claim 1 , wherein the energy accumulator is configured to generate the stored energy when a pressure in the pressure chamber increases, and wherein the energy accumulator is configured to discharge at least a portion of the stored energy when the pressure in the pressure chamber decreases.

3. The valve of claim 1 further comprising:

a valve inlet in the flow path; and

an inlet pressure line between the pressure chamber and the valve inlet,

wherein the one or more valves are configured to enable the liquid having the fluid energy to flow to the pressure chamber through the inlet pressure line.

4. The valve of claim 1 , wherein the one or more valves are configured to enable the liquid in the pressure chamber to discharge from the pressure chamber.

5. The valve of claim 4 , wherein the energy accumulator is configured to discharge at least a portion of the stored energy when the one or more valves enable the liquid in the pressure chamber to discharge from the pressure chamber.

6. The valve of claim 4 , further comprising:

a valve outlet in the flow path; and

an outlet pressure line between the pressure chamber and the valve outlet,

wherein the one or more valves are configured to enable the liquid in the pressure chamber to discharge from the pressure chamber through the outlet pressure line.

7. The valve of claim 1 , further comprising:

a pressure sensor configured to generate a signal indicative of a sensed pressure; and

control circuitry configured to:

determine the sensed pressure based on the signal, and

increase or decrease a pressure in the pressure chamber based on a comparison of the sensed pressure and a pressure setpoint,

wherein the control circuitry is configured to:

increase the pressure in the pressure chamber by at least causing the one or more valves to enable the liquid having the fluid energy to flow to the pressure chamber; and

decrease the pressure in the pressure chamber by at least causing the one or more valves to enable the liquid a fluid in the pressure chamber to discharge from the pressure chamber.

8. The valve of claim 1 , wherein:

the pressure chamber is configured to exert a first force in a first direction on the restricting element using a first pressure of the liquid in the pressure chamber, and

the diaphragm is configured to exert a force in a second direction on the restricting element using a second pressure of a fluid in the flow path.

9. The valve of claim 1 , wherein:

the diaphragm at least partially defines a first area, wherein the diaphragm is configured to generate a first force on the restricting element when the first area is in fluid communication with the liquid in the pressure chamber,

the diaphragm at least partially defines a second area, wherein the diaphragm is configured to generate a second force opposite the first force on the restricting element when the second area is in fluid communication with a fluid in the flow path, and

the first area is less than the second area.

10. The valve of claim 1 , wherein the one or more valves include:

a pressurizing valve configured to enable the liquid having the fluid energy to flow to the pressure chamber; and

a venting valve configured to enable the liquid in the pressure chamber to discharge from the pressure chamber.

11. The valve of claim 1 , wherein the one or more valves includes a three-way valve having at least a first position and a second position, wherein the three-way valve is configured to enable the liquid having the fluid energy to flow to the pressure chamber in the first position and to enable the liquid in the pressure chamber to discharge from the pressure chamber in the second position.

12. The valve of claim 1 , wherein the energy accumulator is configured to generate the stored energy by at least compressing the gas using the second portion of the fluid energy.

13. The valve of claim 1 , wherein the diaphragm is configured to be in fluid communication with the fluid in the flow path.

14. A valve comprising:

a valve inlet;

a valve outlet;

a restricting element between the valve inlet and the valve outlet, wherein the restricting element comprises a valve stem and a valve disc coupled together;

a valve body defining a pressure chamber and defining a flow path from the valve inlet to the valve outlet;

an inlet pressure line between the valve inlet and the pressure chamber;

an outlet pressure line between the valve outlet and the pressure chamber;

one or more valves in fluid communication with the pressure chamber, wherein the one or more valves are configured to:

enable a liquid having a fluid energy to flow from the valve inlet to the pressure chamber through the inlet pressure line, and

enable the liquid in the pressure chamber to discharge from the pressure chamber to the valve outlet through the outlet pressure line;

a diaphragm configured to position the restricting element using a first portion of the fluid energy; and

an energy accumulator configured to generate stored energy using a second portion of the fluid energy, wherein:

the energy accumulator is configured to establish a gas-fluid interface between the liquid and a gas in the energy accumulator,

the pressure chamber is configured to deliver the first portion of the fluid energy to the diaphragm,

the pressure chamber is configured to deliver the second portion of the fluid energy to the energy accumulator,

the energy accumulator is configured to exert a pressure on the liquid in the pressure chamber using the stored energy, and

the diaphragm is configured to adjust a position of the restricting element when the energy accumulator exerts the pressure on the liquid in the pressure chamber and the pressure chamber is fluidly isolated from the flow path by the one or more valves.

15. The valve of claim 14 , further comprising:

a pressure sensor configured to generate a signal indicative of a sensed pressure; and

control circuitry configured to:

determine the sensed pressure based on the signal; and

increase or decrease a pressure in the pressure chamber based on a comparison of the sensed pressure and a pressure setpoint,

wherein the control circuitry is configured to:

increase the pressure in the pressure chamber by at least causing the one or more valves to enable the liquid having the fluid energy to flow from the valve inlet to the pressure chamber through the inlet pressure line; and

decrease the pressure in the pressure chamber by at least causing the one or more valves to enable the liquid in the pressure chamber to discharge from the pressure chamber to the valve outlet through the outlet pressure line.

16. The valve of claim 14 , wherein the energy accumulator is configured to generate the stored energy when a pressure in the pressure chamber increases, and wherein the energy accumulator is configured to discharge at least a portion of the stored energy when the pressure in the pressure chamber decreases.

17. The valve of claim 14 , wherein the energy accumulator is configured to discharge at least a portion of the stored energy when the one or more valves enable the liquid in the pressure chamber to discharge from the pressure chamber to the valve outlet through the outlet pressure line.

18. A method comprising:

holding, using a valve, a liquid in a pressure chamber defined by the valve, wherein the valve includes an energy accumulator configured to exert a pressure on the liquid held in the pressure chamber, wherein the energy accumulator is configured to establish a gas-fluid interface between the liquid and a gas in the energy accumulator;

determining, using control circuitry, a sensed pressure based on a signal from a pressure sensor comparing, using the control circuitry, the sensed pressure and a pressure setpoint;

altering, using the control circuitry, the pressure exerted on the liquid held within the pressure chamber based on the comparison of the sensed pressure and the pressure setpoint by:

increasing the pressure exerted on the liquid held within the pressure chamber by causing, using the control circuitry, a pressurizing valve to enable a flow of liquid to flow to the pressure chamber; and

decreasing the pressure exerted on the liquid held within the pressure chamber by causing, using the control circuitry, a venting valve to enable at least some portion of the liquid held within the pressure chamber to discharge from the pressure chamber; and

adjusting, using a diaphragm of the valve, the position of a restricting element of the valve when the energy accumulator exerts the pressure on the liquid held in the pressure chamber and the pressurizing valve and the venting valve fluidly isolate the pressure chamber from a flow path defined by the valve, wherein the diaphragm is configured to move the restricting element based on a pressure of a fluid in the flow path, wherein the restricting element comprises a valve stem and a valve disc coupled together.

19. The method of claim 18 , wherein the flow of liquid flowed to the pressure chamber has a fluid energy, the method further comprising:

delivering a first portion of the fluid energy to the diaphragm;

delivering a second portion of the fluid energy to the energy accumulator;

adjusting the position of the restricting element using the diaphragm and the first portion of the fluid energy; and

storing energy using the energy accumulator and the second portion of the fluid energy.