Air shut-off valve apparatus for fuel cell system

An air shut-off valve apparatus for a fuel cell system, comprising:

• a valve body having an inlet-side air passage through which supply air supplied into a fuel cell stack flows and an outlet-side air passage through which exhaust air released from the fuel cell stack flows;
• a valve flap pivotally installed within the valve body to open or close the inlet-side air passage and the outlet-side air passage;
• an inlet-side check valve configured to be opened when pressure of the supply air is greater than or equal to a predetermined pressure, to guide the supply air into the fuel cell stack through the inlet-side air passage even while the valve flap is closed;
• and
• an outlet-side check valve configured to be opened when pressure of the exhaust air is greater than or equal to a predetermined pressure, to guide the exhaust air released from the fuel cell stack to flow through the outlet-side air passage even while the valve flap is closed.