Patent ID: 8534509
Filing Date: 2013-09-17
Classification: B65D

Abstract:
1. A fluid dispenser head for mounting on a variable-volume fluid reservoir having a movable wall, the head comprising: a dispenser orifice where a user may recover the dispensed fluid; a sealing closure member that closes the dispenser orifice when the fluid present in the head is at a pressure that is less than a predetermined threshold, and that opens the orifice when the fluid present in the head is at a pressure that is greater than the predetermined threshold; resilient means for urging the sealing closure member against the orifice; and a fluid inlet in communication with the reservoir; the head further comprising a flexible differential membrane defining a bottom face facing towards the inlet and a top face facing towards the dispenser orifice and at least a passage connecting the two faces of the membrane, the bottom and top faces respectively defining bottom and top surface areas that are simultaneously subjected to opposite pressure forces that are exerted by the fluid under pressure on the both faces of the membrane, the bottom surface area being substantially smaller than the top surface area, the closure member being formed by the flexible membrane.