| 摘要 |
<p>The invention relates to an isolating valve comprising a body (1) comprising a canal (4) for the passage of fluid, which is intended to be shut off by upstream and downstream spherical plugs (5, 6), that can be actuated independently of one another between positions allowing the passage of fluid through said canal (4) and positions of shutting off the canal (4), and sealing checking means (34), opening into said canal (4) and between the two spherical plugs (5, 6). The upstream plug (5) is equipped with an upstream seat (14) of the "simple piston effect" type and has no downstream seat. The downstream plug (6) is equipped with an upstream seat (16) of the "simple piston effect" type and with a downstream seat (17) of the "double piston effect" type.</p> |
