Patent ID: 8020732

Claim:
A dispensing device for dispensing a foam, comprising: a manually compressible container having an interior for storing a liquid and air, and a foam-forming assembly to be attached in or on an opening in the container for forming a foam, the foam-forming assembly comprising: a housing having an air passage and a liquid passage, each of which ending in a mouth and being in communication with a dispensing passage which ends in a dispensing opening, and an elastic valve body which, in a rest position, covers the mouth of the liquid passage and the mouth of the air passage in a sealing manner in order to prevent a flow from the liquid passage and the air passage to the dispensing passage, and which, during dispensing, opens the mouth of the liquid passage and the mouth of the air passage in order to allow mixing of air and liquid to take place in the dispensing passage, wherein at least one of the mouth of the liquid passage and the mouth of the air passage is an annular mouth having an annular edge; and wherein the elastic valve body comprises an annular arcuate section, which the annular arcuate section, in a rest position, extends in the annular mouth and sealingly engages the annular edge, and wherein increasing pressure in the interior of the container and on the annular arcuate section initially improves sealing engagement of the arcuate section on the annular edge.