Patent ID: 7658289

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 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; 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 hollow nozzle tower communicating with the valve unit is made to stand, the peripheral wall thereof being formed with gas ejection holes, 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.