Importance

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Abstract

A valve device includes a valve element unit for closing or opening a first opening formed in a casing; a valve element driving unit for rotating the valve element unit around an axis to move to a position facing the first opening, and for moving the valve element unit in a radial direction to seat at the first opening; a first sealing member provided on the valve element unit; and a stopper for restricting a rotation of the valve element unit. The valve element driving unit includes a support for supporting the valve element unit to be rotatable; a shaft part having an eccentric shaft portion connected to the valve element unit and having a center located at a position apart from a rotational center by a predetermined distance; and a driving source for rotating the shaft part. The stopper restricts a rotation of the support in one direction at a position where the valve element unit faces the opening.

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First Claim