| 摘要 |
One-way valve having a flap (4) formed by a partially elastic element comprising, on the one hand, a rigid part (5) fixed by a hooking means (6) to a container (1) containing a viscous product (2) and, on the other hand, an elastic part (8) bearing elastically against a sealing zone (9) integral with the container, the said valve having adjusting means (11, 12) for adjusting the bearing force of the said elastic part on the said sealing zone, the said adjusting means also forming the said hooking means.
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