| 摘要 |
A reservoir tank having a flexible diaphragm disposed above the liquid received in the reservoir tank for intercepting the liquid from being exposed to atmospheric air. The diaphragm has a corrugated form consisting of at least one annular upwardly projecting portion and at least on annular upwardly projecting portion surrounded by the annular downwardly projecting portion, and at least one cut-out portion is formed in the annular downwardly projecting portion to define a horizontally extending escape passage across the annular downwardly projecting portion.
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