| 摘要 |
The one-way valve device for recontamination-protected repeated discharge of a flowable material from a container of a reducible volume includes a valve seat which consists of a rigid plastic material and which is arranged in the container neck and extends transversely across the interior of the container neck and comprises a plurality of passage openings. Moreover, a pin-like projection is formed on the valve seat and extends in the axial direction of the container neck to the exit opening. The valve seat has arranged thereabove an elastic seal which is held with an annular section on the valve seat and comprises a sleeve-like section which surrounds the projection of the valve seat at a radial distance with the exception of its end section which rests on the end section of the projection. A sterilization zone of silver or the like is arranged in the space between the projection of the valve seat and the elastic seal. The application of pressure to the contents of the container has the effect that the sleeve-like part is axially displaced relative to the pin-like projection, so that the contents of the container can exit. Seated on the container neck are also an inner cap and an outer cap which are in threaded engagement with one another. In the closing position of the outer cap, the sleeve-like section of the seal is firmly pressed against the projection of the valve seat, so that no container contents can exit. This system is excellently suited for applying multiple doses without any contamination.
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