| 摘要 |
A flexible, resilient, slit valve (10) including a flexible, resilient head (12) centered on a central axis (27) and extending laterally therefrom, an annular, peripheral attachment portion (19) centered on the central axis, and an annular, flexible, resilient, intermediate portion (20). The head has a convex interior surface (16) and a concave exterior surface (14). The intermediate portion (20) has an interior surface (26) an exterior surface (24). The exterior surfaces (14, 24) intersect at a circular line of intersection (32) having a diameter D |
