| 摘要 |
A closure cap for openings on motor vehicle radiators is provided with a cap inner part that is held on a cap outer part. A valve assembly for opening and blocking a flow connection between the inside of the reservoir and the outside of the reservoir is held inside said cap inner part. The valve assembly comprises a valve body, which can move in a to-and-fro manner, is pressed in a pretensioned manner by spring action against a sealing seat on the cap inner part, and which can be lifted from the sealing seat when a specified limit value of the internal pressure of the reservoir is exceeded. The aim of the invention is to provide a closure cap of the aforementioned type whose sealing seat, which is located between the cap inner part and the valve body facing said cap inner part, undergoes a definable reduction of tension when the venting flow path is opened. To this end, the sealing seat on the cap inner part is formed by an O-ring, which is held inside an axially open annular groove, and this annular groove is radially enlarged by venting pockets provided on a circumferential edge.
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