Fluid exchanger devices, pressure exchangers, and related methods

1. A method of exchanging pressure between fluid streams, the method comprising:

supplying a relatively high-pressure fluid into a first port formed in a first end of a housing of a pressure exchanger;

supplying a relatively low-pressure fluid into a second port formed in a second, opposing end of the housing of the pressure exchanger;

rotating a valve element including a first valve positioned on a first end of a plurality of stationary ducts extending along a longitudinal axis of the pressure exchanger and a second valve positioned on a second, opposing end of the plurality of stationary ducts about the plurality of stationary ducts, wherein each of the first valve and the second valve further comprises an axial port at least partially extending along the longitudinal axis of the housing, each axial port being in communication with an associated port formed in the housing extending in a direction along the longitudinal axis of the housing;

transferring the relatively high-pressure fluid from the first port and into at least one duct of the plurality of stationary ducts with the first valve;

transferring the relatively low-pressure fluid from the second port and into at least one duct of the plurality of stationary ducts with the second valve;

pressurizing the relatively low-pressure fluid with the relatively high-pressure fluid to form a pressurized fluid and a spent fluid;

transferring the pressurized fluid from the at least one duct of the plurality of stationary ducts with the second valve and outputting the pressurized fluid from the pressure exchanger through a third port formed in the second end of the housing; and

transferring the spent fluid from the at least one duct of the plurality of stationary ducts with the first valve and outputting the spent fluid from the pressure exchanger through a fourth port formed in the first end of the housing.

2. The method of claim 1 , wherein:

supplying a relatively high-pressure fluid comprises transferring a super saline solution into the pressure exchanger from a reverse osmosis device; and

supplying a relatively low-pressure fluid comprises transferring a saline solution into the pressure exchanger.

3. The method of claim 1 , wherein supplying a relatively high-pressure fluid, supplying a relatively low-pressure, transferring the pressurized fluid, and transferring the spent fluid occur substantially simultaneously.

4. The method of claim 1 , further comprising offsetting the occurrence of the supply of the relatively high-pressure fluid into a duct of the plurality of ducts and the occurrence of the transfer of the pressurized fluid from the same duct of the plurality of ducts with an angular offset formed between the first valve and the second valve.

5. The method of claim 1 , wherein transferring the relatively high-pressure fluid from the first port and into at least one duct of the plurality of stationary ducts with the first valve comprises directing the relatively high-pressure fluid through the axial port formed in the first valve in a direction along the longitudinal axis of the pressure exchanger and wherein transferring the relatively low-pressure fluid from the second port and into at least one duct of the plurality of stationary ducts with the second valve comprises directing the relatively low-pressure fluid through two radial ports formed in the second valve in a direction at least partially transverse to the longitudinal axis of the pressure exchanger.

6. The method of claim 1 , wherein transferring the relatively high-pressure fluid from the first port and into at least one duct of the plurality of stationary ducts with the first valve comprises directing the relatively high-pressure fluid through two radial ports formed in the second valve in a direction at least partially transverse to the longitudinal axis of the pressure exchanger and wherein transferring the relatively low-pressure fluid from the second port and into at least one duct of the plurality of stationary ducts with the second valve comprises directing the relatively low-pressure fluid through the axial port formed in the first valve in a direction along the longitudinal axis of the pressure exchanger.

7. The method of claim 6 , wherein transferring the pressurized fluid from the at least one duct of the plurality of stationary ducts with the second valve comprises directing the pressurized fluid through the axial port formed in the second valve in a direction along the longitudinal axis of the pressure exchanger.

8. The method of claim 7 , wherein transferring the spent fluid from the at least one duct of the plurality of stationary ducts with the first valve comprises directing the relatively spent fluid through two radial ports formed in the first valve.

9. The method of claim 1 , further comprising forming an axial seal between the first valve and the first end of the plurality of stationary ducts and the second valve and the second end of the plurality of stationary ducts while rotating the valve element.

10. A method of exchanging pressure between fluid streams, the method comprising:

supplying a relatively high-pressure super saline solution into the pressure exchanger of claim 1 from a reverse osmosis device through a first port in a first end of the housing;

supplying a relatively low-pressure saline solution into the pressure exchanger through a second port in a second, opposing end of the housing;

pressurizing the relatively low-pressure saline solution with the relatively high-pressure super saline solution to form a pressurized saline solution and a spent super saline solution;

transferring the pressurized saline solution from the pressure exchanger through a third port formed in the second end of the housing; and

transferring the spent super saline solution from the pressure exchanger through a fourth port formed in the first end of the housing.