Purge valve for fuel cell stack, fuel cell system and method for purging the anode sides of fuel cell sub-stacks

摘要

Purge valve (46) for a fuel cell stack (10), the valve (46) comprising: a housing (70) forming a chamber (72); an inlet passage (48) in fluid communication with the chamber (72); a first outlet passage (54) in fluid communication with the chamber (72); a second outlet passage (58) in fluid communication with the chamber (72); a diaphragm (76) positioned in the chamber (72) and operable to provide a flow passage between the inlet passage (48) and the first and second outlet passages (54, 58) and a flow passage between the first and second outlet passages (54, 58) , 58) when the diaphragm (76) is in a closed position, the diaphragm (76) having a hole (86) between the chamber (72) and the first outlet passage (54) which provides pressure equalization between the chamber (76) Intake passage (48) and the chamber (72) effected when the membrane (76) is in a closed position.