| 摘要 |
A shut-off seal for a rotatable shaft penetrating a fluid-holding tank through an opening below the fluid surface. The shut-off seal has a collar secured to the shaft inside the tank and a positionable annular shut-off ring which may be moved into engagement with the collar. The invention enables leakage-free shutdown for servicing an associated rotary seal without moving the rotary seal axially along the shaft.
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