| 摘要 |
An open/close valve can decrease the exhaust resistance as much as possible in a usual operation. An open/close valve includes a valve casing and a valve element that is housed in the valve casing in a vertically movable manner. The valve casing includes a cylindrical portion that extends vertically. A through hole is formed in the cylindrical portion. A bottom portion is formed on a bottom of the cylindrical portion. A discharge inlet is formed in an upper portion of the cylindrical portion. The valve element includes a cylindrical body that is arranged along an inner surface of the cylindrical portion and has a height that maintains an opening of the through hole and a seal plate that covers an upper portion of the cylindrical body and has a size capable of closing the exhaust inlet.
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