| 摘要 |
The invention relates to a pump for fitting to a receptacle, the pump comprising a pump body and a moving assembly movable relative to the body, having a piston that bears in leakproof manner against the body and that co-operates therewith to define a pump chamber of variable volume. The pump also has, outside the pump chamber, an elastically deformable membrane arranged to return the moving assembly into its initial position after delivering a quantity of substance. The moving assembly has a rod with an internal passage for delivering the substance contained in the pump chamber, the internal passage opening out into the pump chamber via at least one outlet orifice and the pump having a piston that is movable relative to the rod between a pre-compression position in which it closes the outlet orifice(s) and a delivery position in which it releases said orifice(s), the piston being moved from its pre-compression position to its delivery position under drive from the pressure of the substance inside the pump chamber.
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