Gm Global Technolgoy Operations, Inc.

Dieter Kaimann

Steven G Goebel

Balasubramanian Lakshmanan

John P Salvador

Thomas W Tighe

Gary M Robb

David A Arthur

Daniel I Harris

Joseph Nicholas Lovria

Thorsten Rohwer

Daniel T Folmsbee

A method for reducing the probability of an air/hydrogen front in a fuel cell stack is disclosed that includes closing anode valves for an anode side of the fuel cell stack to permit a desired quantity of hydrogen to be left in the anode side upon shutdown and determining a schedule to inject hydrogen during the time the fuel cell stack is shutdown. The pressure on an anode input line is determined and a discrete amount of hydrogen is injected into the anode side of the stack according to the determined schedule by opening anode input line valves based on the determined pressure along the anode input line so as to inject the hydrogen into the anode side of the stack.

Fuel cell operational methods for hydrogen addition after shutdown

A product comprising a phase transfer valve, and wherein said phase transfer valve comprises an actuating valve housing having a housing interior; a liquid hydrogen inlet, a gaseous hydrogen inlet and a hydrogen outlet provided in said valve housing; an actuating valve slidably mounted in said housing interior; and wherein said actuating valve is moveable between a first position for sealing said gaseous hydrogen inlet from said hydrogen outlet and a second position for sealing said liquid hydrogen inlet from said hydrogen outlet.

Multiple phase transfer valve for liquid hydrogen tank

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Mainz, Germany

Dieter Kaimann