| 摘要 |
<p>Double closing member valve (10) comprising:
- a valve body (13) having two sleeves (14, 15) in series and joined together by a breaking area (16);
- two closing members (17, 18) inside said valve body (13), upstream and downstream of said breaking area (16), said closing members being mobile between a rest position, in which they free the passage, and a work position, in which they obstruct the channel upstream and downstream of said breaking area (16);
- spring elements (22) pre-loaded to force said closing members (17, 18) to said work position;
- releasable constraining means (23) acting on said closing members (17, 18) to keep them in said rest position and comprising a bridge element of the breakable, withdrawable or non flame resistant type, arranged outside said valve body (13) astride of said pre-arranged breaking area (16) and with ends associated with said drive shafts (20, 21).</p> |
