| 摘要 |
A liquid drainage system comprising, a receptacle having a chamber to receive liquid, and a depending annular wall in an upper portion of the receptacle. The system has a valve comprising a cup-shaped member of elastic material having a lower wall extending across the cup-shaped member, an upper annular wall extending from the lower wall, with an upper portion of the valve annular wall being snugly received on a lower portion of the receptacle wall, and a hinge member extending outwardly from the cup-shaped member at one side of the lower wall. The cup-shaped member has a slit extending through the cup-shaped member to the hinge member at a location slightly above the lower wall. The slit defines a valve seat above the lower wall with the lower wall serving as a valve element which may sealingly engage against the seat, with the hinge member connecting the lower wall and valve annular wall.
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