| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sealing device improved in durability to be used in strict condition. <P>SOLUTION: A back ring 3 is provided to have a fastening margin a in relation to groove width d of an annular groove 12 in the condition wherein a seal ring 2 and the back ring 3 are combined to be installed in the annular groove 12a, and the back ring 3 is provided with a lip part 3c for releasing back pressure toward a pressure side H in the case wherein the back pressure applying from an atmospheric air side L to the back ring 3 is the predetermined pressure or more. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
