Patent ID: 7717302

Claim:
A pump for mounting on a receptacle, comprising: a pump body having at least one opening; a moving assembly movable relative to the pump body and co-operating therewith to form a pump chamber of variable volume, the at least one opening allowing the pump chamber to communicate with an inside of the receptacle and allowing the pump to operate in a head-down position; an air intake passage formed between the pump body and the moving assembly and capable of communicating with the opening of the pump body; a first lip configured, after the moving assembly has moved away from a rest position in a substance-dispensing direction, to press in leaktight manner against the pump body and prevent communication between the inside of the receptacle and the pump chamber via the opening; and a second lip situated above the first lip when the pump is observed in a head-up position, said second lip being configured to close the air intake passage when the moving assembly is in the rest position and to release the air intake passage when the moving assembly is displaced in the substance-dispensing direction, wherein the moving assembly comprises at least one lip selected among the second lip or a third lip and configured to press against the pump body to close the air intake passage when the moving assembly is substantially at the end of a substance-dispensing stroke.