| 摘要 |
A cap with valve where a seal member is disposed in a fluid flow path of a cap body and urged against a prescribed seal portion. The seal member is of disk-like form or ring form, and provided with lip elements projecting throughout whole circumference of periphery and with recesses formed throughout whole circumference at rear side of the lip elements and having constant length in the radial direction. The seal member is assembled and held to the support plate from rear side of the lip elements and disposed in the cap body so that the lip elements are urged against the prescribed seal portion through biasing means. The cap with valve is provided at opposite surface on rear side of the lip elements in the support plate with an arc-shaped projection fitted corresponding to whole circumference of bottom portion in the radial direction of the seal member at the recesses.
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