Invention Grant
US09010761B2 Redundant seal apparatus and method 有权
冗余密封装置及方法

Redundant seal apparatus and method
Abstract:
An apparatus includes a rotatable shaft having a shaft surface and a first seal disposed in a sealing engagement with the shaft surface. At least a second seal is disposed in a first position relative to the rotatable shaft where the second seal is not in sealing engagement with the shaft surface and is movable to a second position relative to the rotatable shaft where the second seal is in sealing engagement with the shaft surface.
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