Seals
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United States of America Patent
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Feb 21, 2006
Grant Date -
Dec 25, 2003
app pub date -
Jun 17, 2003
filing date -
Jun 24, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A composite seal face ring has an inner ring (60) made of material with good tribological properties, the inner ring (60) being pre-compressed by an outer ring (64) with a high tensile strength and a thermal coefficient of expansion substantially equal to that of the inner ring (60). The seal face ring is assembled by compressing the inner ring (60) and/or expanding the outer ring (64) by fluid under pressure, before inserting the inner ring (60) into the outer ring (64).
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