| 摘要 |
A butterfly-type valve for controlling toner material flow to a toner container, including, a valve plate which is pivotally disposed in an elongate flow path defined by a passage way, wherein the valve plate is pivotal from a closed position which substantially closes a fluid communication along the path to an open position which maximally permitting fluid communication along the path, a gap area defined between the valve plate and the passage way when the valve plate is in the closed position which allows minimum toner material flow therethrough without compressing the toner material, and a pump for supplying air to the gap area when the valve plate is in the closed position to stop the minimum toner material flow.
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