Patent ID: 8262091
Filing Date: 2012-09-11
Classification: F16J

Abstract:
1. A seal assembly for sealing a gap with a high pressure side and a low pressure side between a first component and a second component, the seal assembly comprising: a primary seal configured to be arranged on the first component and spanning the gap on the high pressure side between the first and second component; and a backup ring configured to be arranged on the first component adjacent the primary seal on the low pressure side, the backup ring having an inner diameter and including a scarf cut slit at an angle that is a function of the inner diameter of the backup ring, wherein the backup ring has a first diameter in a first operating condition and a second, expanded diameter during a second operating condition, the backup ring having a first overlapping end portion and a second overlapping end portion during the first operating condition, wherein the slit has a circumferential length and the backup ring has an overall circumference, the slit circumferential length being no more than about 32% and no less than about 5% of the overall circumference, wherein the backup ring has a diameter less than about 0.7 inches.