| 摘要 |
<p>A one-way valve is mounted along or at one end of the tubular shaft supporting the balloon. The valve is externally shaped to deform the neck of the balloon elastically, ensuring maintenance of the inflation pressure whilst allowing sliding inside the neck. An inner shape allows the insertion of internal supporting cylindrical shafts at the ends and the installation of the containment system for the inflation fluid in the centre section. A cylindrical cavity (4) is enclosed by two bases, one (6) smooth surfaced with a central hole communicating with the outside. A second base (5) is provided with raised radial ribs and a central axial hole connecting with the balloon. A seal is freely slidable in the cavity.</p> |
