Introduction
AmeriSeal 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 spring back characteristics are important when used in cavities that experience large amounts of separation during normal operation. Applications include gas turbines engine housings, hot air ducting, exhaust manifold couplings and ball valve seat seals. This type of metallic seal exhibits very good fatigue resistance. AS 1895 E-seals are available, please consult our sales department.
Load and Spring Back
E-Rings have excellent load deflection relationships. The compression load requirements are very low with higher spring back compared to other metallic seal types. The load requirements will increase proportionally to system pressure, extending the spring back capability in extreme conditions.
Materials
Inconel X-750: Specifications AMS 5598, 5667 and service temperature up to 1350°F
Inconel 718: Specifications AMS 5596, 5663 and service temperature up to 1475°F
Waspaloy: Specifications AMS 5544 and service temperature 1700°F
Plating and Coatings
In static applications, plating 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 in between the seal and 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 us for assistance with plating and coating selection for your specific applications.
