Patent ID: 7658290

Claim:
A substrate storage container including: a container body; a door for opening and closing the container body; a valve unit attached to a through-hole formed in the bottom of the container body, for regulating the gas flow with respect to the container body, characterized in that the valve unit comprises: a fixed sleeve for gas flow, fitted in the through-hole; a holding sleeve for gas flow, threadably mated with the fixed sleeve; and an elastic check valve built in between the fixed sleeve and the holding sleeve; wherein the elastic check valve is actuated by gas pressure; and an interior lid sleeve for gas flow, opposing the elastic check valve, and one of the fixed sleeve and the interior lid sleeve is adapted to be opened and closed by the elastic check valve, so that gas will pass through when the elastic check valve is open while gas will be prevented from passing when the elastic check valve is closed; and a deflecting plate, the deflecting plate being attached in the vicinity of the through-hole, and being formed having an approximately L-shaped section with its longer part opposed to the valve unit with a gap therebetween, wherein a rib is formed and extended outward from the periphery of the through-hole and the fixed sleeve is formed with a flange that is in contact with the periphery of the rib while the holding sleeve is formed with a flange that is in contact with the periphery of the through-hole.