Active surface for a packing seal intended for a shaft sealing system
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United States of America Patent
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Mar 5, 2019
Grant Date -
Aug 11, 2016
app pub date -
Jul 22, 2014
filing date -
Jul 24, 2013
priority date (Note) -
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Abstract
A packing seal is provided for a system for sealing the shaft of a primary motor-driven pump unit of a nuclear reactor, intended to ensure sealing between the primary circuit and the atmosphere. The packing seal includes a rotary active surface and a floating active surface, and a face of the floating active surface and/or the rotary active surface is covered by a protective layer made from a material having surface energy greater than 30 mJ/m2 and an electron donor component less than 15 mJ/m2.
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