| 摘要 |
This invention relates to a seal cartridge comprising at least two back-to-back lip seals. A first, generally L-shaped sleeve is applied against the back wall of the seal ring such that its axially extending cylindrical surface retracts the lip portion of the outboard seal into a non-deployed position. A second, generally L-shaped sleeve is fitted up against the back of the first sleeve so as to place the lip end of the inboard seal in a similarly raised or retracted position. Upon installation of the seal ring about the shaft and in the shaft housing, the second, innermost sleeve is removed, such that the inboard lip seal is deployed against the surface of the shaft. Upon detection of leakage past the inboard seal, the first sleeve is retracted to thus deploy the remaining outboard lip seal.
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