Patent ID: 8640977

Claim:
A push-button for a dispensing system for a liquid under pressure, said push-button comprising a body having a mounting well on a delivery tube for the liquid under pressure and a housing in communication with said well, said housing being provided with an anvil around which a spraying nozzle is mounted in such a way as to form a dispensing path of the liquid between said housing and a vortex unit comprising a vortex chamber provided with a dispensing orifice as well as at least one supply channel of said chamber, said nozzle having a proximal wall wherein is formed a print of the vortex unit and said anvil having a distal wall whereon the proximal wall of the nozzle is pressing against in order to delimit said vortex unit between them, said distal wall having a recess which is formed across from the print of the vortex chamber, wherein the maximum depth of said recess is between 25% and 300% of the minimum depth of the print of the at least one supply channel, wherein the maximum depth of the recess is limited as not to disturb swirling of the liquid in the vortex chamber, and wherein the recess has an opening a dimension of which is between 80% and 110% of a diameter of the vortex chamber.