Metal E Ring Seals

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.

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

HARDWARE

Internal Pressure

External Pressure

C ØA GROOVE
FREE HEIGHT TOL DIAMETER RANGE DEPTH (F) MIN WIDTH (G) R MAX
1.90 +0.076/-0.076 38.1 – 304.8 1.55/1.60 2.29 0.38
2.49 +0.076/-0.076 57.2 – 457.2 1.91/2.03 2.79 0.51
2.74 +0.076/-0.076 57.2 – 457.2 2.16/2.26 2.92 0.51
2.74 +0.127/-0.127 50.8 – 457.2 2.16/2.26 4.32 0.51
3.35 +0.076/-0.076 63.5 – 812.8 2.84/3.00 3.68 0.76
3.56 +0.127/-0.127 63.5 – 812.8 2.95/3.05 4.06 0.76
3.56 +0.127/-0.127 57.2 – 812.8 2.95/3.05 5.84 0.76
5.54 +0.127/-0.127 88.9 – 1219.2 4.55/4.65 5.84 1.02
7.49 +0.152/-0.152 152.4 – 1524.0 6.22/6.35 8.00 1.52

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 contact Moontown for assistance with plating and coating selection for your specific application.

HEAT TREATMENT

E Seals will be annealed, depending on complexity of form. Final form is solution annealed and age hardened (long cycle).

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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