| 摘要 |
<p>Detachable insert provided for installation in the tubulure of a pneumatic tyre valve for a bicycle, motorcycle or automobile essentially constituted of a tubular body (10) containing a valve mechanism. This body is provided in its upper part with an external cap thread (14) and in its lower part with a seal (40) for sealing the tubulure. The valve mechanism comprises at least one rod (50) in the lower part of which is installed a valve seal (60) which sits against a valve seat (17) inside the body (10). The body (10) furthermore has, in combination, an inlet pipe (22) whose diameter is at least greater by one and a half times than that of the rod (50), at least one longitudinal groove (30) along the median part of the internal pipe (20) for receiving a possible means of preventing the rotation of the rod (50) and a restriction (18) at its lower outlet retaining, if necessary, the rod (50) at the bottom. <IMAGE></p> |
