| 摘要 |
A pump of the type comprising a substantially cylindrical body (1) in one piece provided, in its lower part, with a port (11) for admission of a product and with a valve constituted by a cavity (10) containing an element (2) capable of moving between a lower stop (12b) corresponding to the obturation of said admission port (11) and an upper stop (12a) corresponding to the opening of said port (11), and wherein said upper stop (12a) is formed by at least one discontinuous internal projection (12) whose transverse dimension (x) measured in the cavity (10) is at least equal to 20% of the largest transverse dimension of the mobile element (2).
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