Substrate storage container with umbrella-shaped seal lip

A substrate storage container, comprising:

• a container body for storing at least one substrate;
• a lid for closing an opening of the container body;
• and
• at least one valve for controlling gas flow to the container body or from the container body,
• wherein the at least one valve comprises a shaft portion that extends along a first direction and an elastic, non-metallic seal lip in a communication passage that extends in the first direction and communicates between an outside of the container body and an inside of the container body, and
• wherein the seal lip extends around the shaft portion when viewed in the first direction to form a substantially umbrella shape which closes to be coupled to the shaft portion on one side in the first direction and opens on the other side in the first direction,
• wherein the communication passage is partitioned by the seal lip into a first passage that communicates with the outside of the container body and a second passage that communicates with the inside of container body, and
• wherein an end of the seal lip on the other side is configured to elastically deform in a manner away from the inner peripheral wall of the communication passage to fluidly connect the first passage to the second passage when a pressure to the seal lip applied from a close side toward an open side of the substantially umbrella shape is higher than a pressure to the seal lip applied from the open side toward the close side of the substantially umbrella shape by a predetermined value or more, otherwise the end of the seal lip on the other side abuts an inner peripheral wall of the communication passage to block the fluid communication between the first passage and the second passage.