| 摘要 |
<p>A unidirectional relief valve of flat kind to be applied inside hermetic containers, characterized by the fact that the cap (2), which is of circular shape and has a central hole (3), has a symmetric structure, and on both faces are present identical ribs (5), allowing such identity and symmetry to insert the cap (2) inside the valve body (13) without the need to pre-orient it.</p> |
