Abstract: The invention provides a dispensing assembly to dispense a foam, comprising: ?—a double cylinder element (2) mounted or to be mounted in an opening of a container (100), comprising a liquid cylinder (3) and an air cylinder (4), wherein the liquid cylinder has a smaller diameter than the air cylinder, and wherein the liquid cylinder and the air cylinder are arranged substantially concentrically, and ?—a piston assembly (10) comprising a liquid piston (11) and an air piston (12) for reciprocal movements in the liquid cylinder and air cylinder, respectively, and a common operating part for operating the liquid piston and air piston, ? wherein a liquid pump chamber (14) is at least delimited by the liquid cylinder and the liquid piston, said liquid pump chamber having a liquid inlet (15) and a liquid outlet (16), ? wherein an air pump chamber (25) is at least delimited by the air cylinder, the air piston and the liquid piston, said air pump chamber having an air inlet (26) and an air outlet (27), ? wherein the pi

Abstract: A dispensing assembly to dispense a foam, having: a liquid pump having a liquid inlet (15) and a liquid outlet (16), an air pump having an air inlet (26) and an air outlet (27), a mixing chamber (29), wherein the air outlet and the liquid outlet are in fluid communication with the mixing chamber, a dispensing channel (30). A first end of the dispensing channel is in fluid communication with the mixing chamber (29) and the second end forms a dispensing opening (31) for dispensing of foam. The dispensing channel (30) and the mixing chamber (29) are connected to each other via a constriction. The constriction is formed by an opening having a cross section which decreases towards the dispensing channel.

Abstract: The invention relates to a system for dispensing a foam of a fluid product (P) comprising a head (3) wherein a mixing chamber (4) of said product with air (A) is formed, said head having: a passage for product (23) and a passage for air (25); a unit for foaming (5); a supply valve (30) of the mixing chamber (4) which comprises a product valve (31) and an air valve (32); a passage for return air (33) which is provided with an air return valve (34); the supply valve comprising a membrane (30) whereon the product (31) and air (32) valves are formed, said membrane being arranged in order to be reversibly mobile starting at a pressure that the source of product (24) or that the source of air (26) exerts on it, between a stable position wherein the passages of the product (23) and of the air (25) are closed by the intermediary of the corresponding valve (31, 32) and a stressed position wherein the passages for product (23) and for air (25) are open in order to supply the mixing chamber (4).