Method for opening tank shut-off valves in gas feeding...

Details Method for opening tank shut-off valves in gas feeding... Method for opening tank shut-off valves in gas feeding...

2005-07-12

2008-05-06

Lee, Kevin (Department: 3753)

Fluid handling

Processes

Involving pressure control

C137S255000, C137S488000, C429S006000

Reexamination Certificate

active

07367349

ABSTRACT:
A method for opening tank shut-off valves in a fuel cell system that includes multiple pressurized tanks. A flow control device is positioned in a supply line downstream of the tank shut-off valves. When the system is started up, only one of the tank shut-off valves is opened to allow the pressure in the supply line to increase between the tank shut-off valves and the flow control device before the other tank shut-off valves are opened. Therefore, only one of the tank shut-off valves is subjected to the high pressure difference that induces significant valve wear and tear. The valve opening sequence is controlled so each of the tank shut-off valves is selected as the one to be opened at system start-up by a cycling process.

REFERENCES:
patent: 6145535 (2000-11-01), Louchart, III
patent: 6371145 (2002-04-01), Bardon
patent: 7127937 (2006-10-01), Thyroff

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