Mechanical seal with PFA bellows
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United States of America Patent
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Jul 26, 2016
Grant Date -
Apr 9, 2015
app pub date -
Dec 15, 2014
filing date -
Nov 28, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A mechanical seal has a stationary face and rotating assembly adjacent to the stationary face. The rotating assembly includes an upper bellows ring, a lower bellows ring and a runner between the lower bellows ring and the stationary face. A bellows extends between the upper bellows ring and the lower bellows ring. In preferred embodiments, the bellows is constructed from a perfluoroalkoxy polymer and is secured within the upper bellows ring and the lower bellows ring by a selected locking mechanism. The locking mechanism may include the use of crimp rings configured for a press fit engagement within the upper and lower bellows rings. Alternatively, the locking mechanism may employ locking rings configured for threaded engagement with the upper and lower bellows rings.
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