| abstract |
A dispenser (1) for a liquid product (P), provided with a dispensing head (7) has an axially movable push button (26) defining a pumping chamber (22) having an intake opening (14) for the product, obturated by an admission valve (16) carried by a piston (12). The piston has at least one sealing lip (12a, 12b) in contact such that the internal sides are displaced between a high position and a low position, the passing from the low position to the high position causing the product to be drawn in and the reverse passing causing the drawn-in product to emerge through a dispensing valve (40). A spring (32) is provided for restoring the push button (26) into its high position. The admission valve (16) and the piston (12) are mounted on a collar (4) having a seat (18) for the admission valve (16). The sealing lip (12a, 12b) is made of a rigid or semi-rigid material, and the admission valve (16) is formed by a membrane made of a flexible material. |