Patent ID: 7516874

Claim:
A one-way device for discharging a flowable material from a container of a reducible volume comprising an outer cap which includes an exit opening for the material, said one-way device comprising: a valve seat arranged in a neck of the container and comprising a base body which extends transversely across the opening of the container neck and rests on the inner wall of the container neck and includes at least one passage opening, and a projection which extends in axial direction of the container neck towards the exit opening; an elastic seal which comprises an annular section resting on the base body, and a sleeve-like section which surrounds the projection at a radial distance where in the closed state, the one-way valve device rests on the projection; and an annular inner cap secured to the container neck and grips over said neck with an outer annular wall and an inner annular wall, the outer cap being arranged to be movable between a rearward closing position and an advanced opening position, and comprising an inner annular attachment which in the closing position presses the sleeve-like section of the seal into abutment with the projection.