Patent ID: 8485398

Claim:
A one-way valve for discharging a liquid out of a container having a neck, comprising an outer cap which is fastened to the container neck and comprises an exit channel for the liquid, a valve body of elastic material which is arranged between the container and the outer cap, the valve body extending over the opening of the container neck and comprising a projection which projects into the exit channel of the outer cap and is arranged therein to be movable back and forth, wherein a space remains between an inner wall of the exit channel and an outer circumference of the projection, wherein at least one cut severs a wall of the valve body, through which cut liquid passes into the space of the exit channel upon exertion of pressure on the container; wherein a stop defines an advance movement of the projection in a direction of an opening of the exit channel; wherein the projection comprises an annular shoulder section on an outer circumference of the projection which is spaced apart from and opposite to a rear edge portion of the exit channel of the outer cap in a pressureless initial state of the valve body; and wherein a flow of the liquid to the exit opening of the outer cap is interrupted when the projection is pressed against the stop.