本文件已被宣布为“稳定”，不再接受货币定期审查。用户负责验证参考文件和技术要求的持续适用性。新技术可能存在。人们发现，使用等边三角形截面的液压密封支承环可以提高高压O形密封圈的寿命和可靠性，尤其是在高温应用中。本航空航天信息报告（AIR）描述了这些支承环的设计和操作，列出了推荐的密封槽和压盖尺寸，提供了将其安装到液压元件中的建议，并概述了其使用的优点和局限性。

This document has been declared "Stabilized" and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability of technical requirements. Newer technology may exist.The use of equilateral triangle cross-section hydraulic seal backup rings has been found to improve the life and reliability of high pressure O-ring seals especially for high temperature applications. This Aerospace Information Report (AIR) describes the design and operation of these backup rings, tabulates recommended seal groove and gland dimensions, offers recommendations and suggestions for their installation into hydraulic components, and outlines their advantages and limitations of their use.