Abstract: A filling method for filling a reservoir (10) of variable working volume with a fluid, the method being characterized in that the reservoir (10) is firstly emptied of any content, such that its working volume is substantially zero, and the fluid is then injected into the reservoir, thereby increasing the working volume of the reservoir (10).

Abstract: A fluid dispenser comprising: a fluid reservoir (10) serving to contain fluid; and a dispenser head (2) mounted on the reservoir (10) to take fluid from the reservoir, said head (2) defining a dispensing chamber (26) communicating with the reservoir via an inlet valve (25, 215) and communicating with the outside at a dispensing orifice via an outlet valve (237, 222); said dispenser being characterized in that the chamber (26) comprises at least one elastically deformable actuating wall (231) that is depressed in order to generate a pressure inside the chamber that is high enough to close the inlet valve and to open the outlet valve.

Abstract: A method of assembling a fluid dispenser comprising: a dispenser member (2), such as a pump, the member including an inlet tube (22; 61) in which there extends an inlet for admitting fluid into the dispenser member; a reservoir (10) for containing fluid, said reservoir comprising a cylinder (11; 11?) and a follower-piston (14) that is slidably mounted in said cylinder; and an annular dish (32; 32?) presenting an outer periphery (33) that is secured to the cylinder (11; 11?), and an inner periphery (321) defining an opening (20) of section that is small relative to the cylinder, the working volume of the reservoir (10) being defined between the dish (32; 32?) and the follower-piston (14) over a height of the cylinder, the method including the successive steps of: filling the reservoir (10) with fluid; and engaging the tube (22) in leaktight manner in the opening.

Abstract: The invention concerns a fluid product dispenser comprising a gas reservoir (10), a fluid product reservoir (20), a dispensing head comprising at least one dispensing orifice (30). The gas reservoir and the fluid product reservoir are connected to the head so that their contents can communicate with the at least one dispensing orifice. The dispenser comprises a movable actuation wall (14; 24) to simultaneously generate a pressure state in the gas and fluid product reservoirs and thus force the fluid product and the gas through the the at least one dispensing orifice.