| 摘要 |
<p>1. A device for maintaining the seal between two parts capable of moving in relation to one another, characterized in that it comprises at least two independent so-called sealing assemblies (39, 40) and (39a, 40a), each of these sealing assemblies having at least two possible states, a first state (39, 40) in which it provides the seal between said two parts, and a second state (39a, 40a) in which it does not provide the seal, in that each of said sealing assemblies is deformable and in that it additionally comprises control means operating said sealing assemblies intermittently.</p> |
