Patent ID: 7866513

Claim:
Device for dispensing and intaking a liquid or semi-liquid product by means of a dosage chamber of a pump body, said device comprising a piston which is mounted fixed in the pump body, said piston comprising one end inserted in a watertight manner in said chamber, the end of the piston being covered with an elastically deformable membrane, characterised in that said membrane comprises an elastically deformable transversal wall having an at least partially flat top face extending across the end of the piston, the transversal wall forming an intake valve being provided with a central supply orifice extending through the transversal wall, and an elastically deformable cylindrical attachment skirt equipped with at least one sealing peripheral lip in sliding contact with an inner wall of the chamber, wherein the sealing peripheral lip of the elastically deformable cylindrical attachment skirt is pressed between the inner wall of the chamber and an outer wall of the piston, wherein said device further comprises a projecting element forming a valve seat on the end of the piston for blocking the central supply orifice in a watertight manner on a bottom face of the transversal wall, and wherein said device comprises a connection element wholly within the pump body for connecting said piston to said pump body, wherein said connection element is an independent part from said membrane and said pump body and is connected to a bottom part of said pump body over a conduit extending up from the bottom part of said pump body.