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    • 78. 发明申请
    • VALVE THAT IS NORMALLY CLOSED IN THE FREE STATE
    • 在自由状态下正常关闭的阀
    • US20080077077A1
    • 2008-03-27
    • US11860606
    • 2007-09-25
    • David Williams
    • David Williams
    • A61M35/00
    • F16K1/12
    • A valve system comprising a valve design in which the valve is normally closed is disclosed. The normally closed valve can comprise a circular valve seal face formed by the underside of a rim of an elastomeric valve boss and a circular valve seat, which is formed by the rim of a through-hole molded into, for example, a plastic cassette, such that the valve seal face, the valve seat, and the through hole are concentric. The valve boss can be a hollow “mushroom” shaped valve boss, or a conical-shaped valve boss. If no force is applied to the inside surface of the valve boss, no fluid can pass through the valve as the valve seal face rests against the valve seat as a result of the steady free-state load created by the stretch of the valve boss over the slightly longer through hole. When a force is applied to the inside surface of the valve boss, the valve seal face is displaced from the valve seat, allowing fluid between the valve seal face and valve seat and then to pass between the valve boss and the inside surface of the through hole.
    • 公开了一种阀系统,其包括阀门设计,其中阀门常闭。 常闭阀可以包括由弹性阀凸台的边缘的下侧形成的圆形阀密封面和由模制到例如塑料盒中的通孔的边缘形成的圆形阀座, 使得阀密封面,阀座和通孔是同心的。 阀门凸台可以是一个中空的“蘑菇”形阀门,也可以是一个锥形阀门。 如果阀座的内表面没有施加力,则由于阀门凸起的拉伸产生的稳定的自由状态负载导致阀密封面靠在阀座上,所以没有流体能够通过阀门 稍长一点的通孔。 当力被施加到阀座的内表面时,阀密封面从阀座移位,允许在阀密封面和阀座之间流体,然后在阀凸台和通孔的内表面之间通过 孔。