| 摘要 |
<p>The undesired manipulation of the ball valves that have a visible lever for the action may cause problems and also serious accidents. These drawbacks or problems, and others that are derived from them, can be solved with the valve described in this invention, which has a cap (5) covering the part of the shaft (3) projecting from the tubular body (1) and which has inside means to engage to the shaft (3) and turn it and also means to secure it on the shaft (3) that can be manipulated from outside using a key (M) that accesses it through an opening (15) at the top of the cap (5).</p> |
