Patent ID: 8492051

Claim:
An integrated valve system for a fuel cell stack comprising: an air shut-off valve including a first housing disposed in an air supply line between a humidifier outlet and a cathode inlet, and a first valve plate rotatably provided in the first housing, the air shut off valve preventing air from entering a cathode when a fuel cell is shut down; a bypass valve including a second housing and a second valve plate disposed in the second housing, wherein the second housing is disposed at a position at which an air discharge line between a cathode outlet and the humidifier inlet and a branch line communicating with outside air intersect wherein the bypass valve is coaxially coupled to the air shut-off valve as one module so that the bypass valve and the air shut off valve are simultaneously opened or closed; and a drive means that opens and closes the bypass valve and the air shut off valve including: a drive shaft coaxially coupling the first valve plate in the first housing with the second valve plate in the second housing, a reduction gear disposed on an end of the drive shaft, and a motor having a drive gear which engages with the reduction gear.