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INTRODUCTION
E-Rings (E cross section seals, convolution seals) are engineered
to operate in applications that require light loading, flexibility and
high temperature capability. E-Rings operate primarily within the
elastic limits of the material. The superior flexibility or springback
characteristics are important when used in cavities that
experience large amounts of separation during normal operation.
Applications include gas turbine engine housings, hot air ducting,
exhaust manifold couplings and ball valve seat seals. This type of metallic seal exhibits very good fatigue resistance.
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MATERIALS
Inconel X-750 Specification AMS 5598, 5667
Service Temperature up to 730ºC
Inconel 718 Specification AMS 559, 5663
Service Temperature up to 800ºC
Waspaloy Specification AMS 5544
Service Temperature 925ºC
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PLATINGS & COATING
In static applications, platings and coatings offer only minor
sealing enhancement due to the low force and resultant low
sealing stress. In higher pressure applications, the stress can
increase to allow the plating to smear into the cavity
imperfections. In dynamic applications where the seal is
subjected to fluctuating loads and cavity changes, the plating
will work between the seal and the cavity improving sealing and
also lubricating the two components. Cobalt-Molybdenum-
Chromium-Silicon alloy coating can be applied to the seal
surfaces to protect the seal from wear and fretting. Please
consult ASE engineering for assistance with plating and coating
selection for your specific application.
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HEAT TREATMENT
E Seals will be annealed, depending on complexity of form. Final form is solution annealed and age hardened (long cycle). |
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LOAD & SPRINGBACK
E-Rings have excellent load deflection relationships up to the
cavity depths shown in table 1. Seating loads shown in the
tables are typical for the various cross sections compressed
to the cavity depth shown. The compression load requirements
are very low with higher springback compared to other metallic
seal types. The load requirements will increase proportionally
to system pressure, extending the springback capability in
extreme conditions.
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