| 摘要 |
The stopper (10) of the valve consists of an eccentric plate equipped with two elastic seals (16, 21) interacting with seats (17, 18) carried by the valve body (7). The upstream seat (18) may be moved axially upstream and constitutes, together with the corresponding seal (21), a standby seal allowing the working seal (16) to be overhauled without having to drain the hydraulic installation. <IMAGE>
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