| 摘要 |
<p>Unidirectional opening valve comprising a flap (4) consisting of a partially elastic element comprising, on the one hand, a rigid part (5), fastened by a catching means (6) to an enclosure (1) containing a viscous product (2) and, on the other hand, an elastic part (8), held elastically so as to bear on a leaktightness zone (9) integral with the enclosure, the said valve comprising adjusting means (11, 12) for the bearing force of the said elastic part on the said leaktightness zone, the said adjustment means also constituting the said catching means. …<IMAGE>… </p> |
