| 摘要 |
The invention relates to a sealing device for a rotary shaft. This device 41 uses differential pressures to maintain a seal, formed from two elements 52, 66, compressed gradually as it wears. The sealing elements 52, 66 have a shape which is inclined or in multiple coils in order to ensure hydrodynamic lubrication of the shaft 14 which they surround. Application field: linings for drilling wells for oil, gas, etc. <IMAGE>
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