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A process fluid handling device in an electrochemical cell system having a sealing system assembly between a process fluid compartment and a drive compartment of the fluid handling device. The sealing system includes a double seal configuration forming an interconnection compartment which is supplie

A process fluid handling device in an electrochemical cell system having a sealing system assembly between a process fluid compartment and a drive compartment of the fluid handling device. The sealing system includes a double seal configuration forming an interconnection compartment which is supplied with barrier fluid. The sealing system provides isolation of pressurized process fluids from the drive compartment.

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1. A fluid handling device for a process fluid comprising: a process fluid compartment in contact with process fluids having a first pressure; a drive compartment having a second pressure and having a drive unit for moving the process fluids in said process fluid compartment, wherein said first pres

1. A fluid handling device for a process fluid comprising: a process fluid compartment in contact with process fluids having a first pressure; a drive compartment having a second pressure and having a drive unit for moving the process fluids in said process fluid compartment, wherein said first pressure is greater than said second pressure; and a sealing assembly disposed between said process fluid compartment and said drive compartment, comprising a ring, a first seal, and a second seal, wherein said first seal and said second seal form an interconnection compartment through which said drive unit extends, wherein the ring is fixed to the drive unit inside the interconnection compartment on a first surface of the ring by a first collar and on a second surface of the ring by a second collar, wherein the first collar is sealingly fixed to the drive unit and extends between the drive unit and the first seal and the second collar is sealingly fixed to the drive unit and extends between the drive unit and the second seal; wherein said sealing assembly substantially prevents migration of said process fluids to said drive compartment. 2. The fluid handling device according to claim 1 wherein said interconnection compartment of said sealing assembly has a third pressure greater than said first pressure. 3. The fluid handling device according to claim 2, wherein a pressure difference between said third pressure and said first pressure is less than or equal to about 1.5 bar. 4. The fluid handling device according to claim 2, wherein a pressure difference between said third pressure and said first pressure is between about 0.1 to about 0.5 bar. 5. The fluid handling device according to claim 2, wherein said process fluid is delivered to or from a fuel cell. 6. The fluid handling device according to claim 2, wherein said interconnection compartment contains a pressurized barrier fluid. 7. The fluid handling device according to claim 6, wherein said pressurized barrier fluid comprises a portion of a fluid stream delivered to or from a fuel cell. 8. The fluid handling device according to claim 6, wherein said pressurized barrier fluid comprises a portion of a fluid stream delivered to or from a storage vessel. 9. The fluid handling device according to claim 1, wherein said first seal comprises a first seal head for facing the first surface of the ring and said second seal comprises a second seal head for facing the second surface on an opposite side of said first surface of the ring, wherein the fluid handling device is operable to form a gap between said first or said second surface of said ring and said first seal head and said second seal head, respectively, less than or equal to about 5 μm. 10. The fluid handling device according claim 9, wherein said first surface has at least one groove formed therein for enhancing barrier fluid flow speed between said ring and said first seal head. 11. A method of operating a fluid handling device in a fuel cell, the method comprising: forming an interconnection compartment between a first seal bounded by a process fluid compartment and a second seal bounded by a drive compartment, said interconnection compartment containing a shaft that extends from said process fluid compartment containing process fluids to said drive compartment wherein said interconnection compartment further houses a ring for sealing that rotates with said shaft wherein the ring is fixed to the shaft inside the interconnection compartment on a first surface of the ring by a first collar and on a second surface of the ring by a second collar, wherein the first collar is sealingly fixed to the shaft and extends between the shaft and the first seal and the second collar is sealingly fixed to the shaft and extends between the shaft and the second seal; and supplying a barrier fluid to said interconnection compartment, wherein said barrier fluid has a pressure greater than or equal to said process fluid compartment, thereby preventing migration of process fluids through said first seal to said interconnection compartment. 12. The method according to claim 11, wherein at least a portion of said barrier fluid is supplied from a fluid stream delivered to or from the fuel cell. 13. The method according to claim 11, wherein at least a portion of said barrier fluid is supplied from a fluid stream delivered to or from the cathode. 14. The method according to claim 11, wherein at least a portion of said barrier fluid is supplied from a fluid stream delivered to or from the anode. 15. The method according to claim 11, wherein at least a portion of said barrier fluid is supplied from a fluid stream delivered from a barrier fluid storage vessel. 16. The method according to claim 11, wherein the first seal is biased toward the first surface of the ring to open a gap between the first seal and the first surface while the fluid handling device is operating, and the second seal is biased toward the second surface of the ring to open a gap between the second seal and the second surface while the fluid handling device is operating.