| 摘要 |
A dosing head (1) includes a dosing chamber (30), of axis X, inside which a piston (21) is slidably fitted, a first surface (31) of which is in communication with the interior of a container and a second surface (25) of which is in communication with the dosing chamber (30). The piston (21) is fitted so as to be able to pass from a first position in which the dosing chamber (30) has a maximum volume to a second position in which the dosing chamber has a minimum volume. The dosing chamber (30) includes at least one inlet (12, 13) which is open when the piston (21) is in the first position and is closed when the piston (21) is in the second position. The piston (21) is coupled to a closure member (40) forming at least one passage (27, 28, 100-110) between the said closure member (40) and an outlet (20) for allowing a dose of the product to be expelled.
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