| 摘要 |
A cap with valve of the invention comprises a cap body having a fluid flow path with a stepped portion, a seal member disposed in the fluid flow path of the cap body and having outer and inner lip elements and making only the outer lip element abut on the stepped portion of the cap body, a support plate fixing the seal member and urging it to the stepped portion of the cap body and having a fluid flowing hole at the center, and a valve plate abutting on the inner lip element of the seal member and biased to close inner circumference of the inner lip element. An annular groove is formed at inner periphery of an opposite surface of the seal member to the support plate, and a stepped portion corresponding to the annular groove is formed on the support plate, thereby the seal member is fitted and fixed to the support plate through the annular groove and the stepped portion. A recess is formed on at least one of rear surface of the outer and inner lip elements and the support plate so that gap is produced at whole circumference of rear surface of the outer and inner lip elements of the seal member and the support plate at the non-pressed state of the seal member.
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