| 摘要 |
A secondary seal for use in a high temperature and pressure environment, including only non-elastomeric elements, such as an annular wound spring essentially enclosed on three sides by a polymer cladding. Two lips surround the spring, while permitting an exposed spring section to maintain direct contact with a radial wall surface of a disc which retains the secondary seal disposed annularly around the back face of a seal primary ring. Optional ridges having flat sealing surfaces on one sealing surface of the secondary seal defines a number of discrete annular cells to provide a cascading pressure profile across the sealing surface.
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