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    • 3. 发明授权
    • Method for molding duckbill valve
    • 鸭嘴阀成型方法
    • US6136253A
    • 2000-10-24
    • US263026
    • 1999-03-05
    • Robert Alfread Bennett
    • Robert Alfread Bennett
    • F16K15/14B29C45/26
    • F16K15/147Y10T137/7879Y10T137/788Y10T137/7882Y10T137/7883
    • A duckbill valve is provided which includes a hollow cylindrical elastomeric body with first and second ends. The first end has walls parabolically tapering to an elongate slit, the slit being surrounded by an upper and lower lip. The second end has a non-uniformly round (e.g. oval) outer wall terminating in an open mouth. When inserted into a perfectly round apertured fitting, the non-uniformly round outer walled elastomeric body is bowed to form-fit the round configuration thereby forcing shut the lips and slit. Upon increased air pressure within the elastomeric body, the slit is forced open. In a second embodiment, the inner wall of the second end may be non-uniformly (e.g. oval) round. Insertion of a round tubular fitting within the non-round inner wall of the elastomeric body also achieves a bowed form-fit configuration which forces shut the lips and slit.
    • 提供了一种鸭嘴阀,其包括具有第一和第二端的中空圆柱形弹性体。 第一端具有抛物面地逐渐变细到细长狭缝的壁,狭缝被上下唇包围。 第二端具有终止于开口的不均匀的圆形(例如椭圆形)外壁。 当插入完全圆形有孔的配件时,不均匀的圆形外壁弹性体被弯曲以形成配合圆形构型,从而迫使嘴唇和狭缝闭合。 当弹性体内的空气压力增加时,狭缝被强制打开。 在第二实施例中,第二端的内壁可以不均匀(例如椭圆形)。 在弹性体的非圆形内壁内插入圆形管状配件还实现了弯曲的形状配合构造,其强制关闭唇部和切口。