| 摘要 |
Rotary shaft seal means for effecting a fluid seal between a shaft and wall means defining a space extending outwardly of said shaft and disposed to receive said seal means. Said seal means is subject to fluid compaction and comprises an O-ring of rubberlike material having an annular crown portion sealingly engaging said shaft. Fluid blanking means seals off a portion of said O-ring which would otherwise be exposed to fluid pressure to reduce the fluid compaction of said O-ring at said crown portion.
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