| 摘要 |
PROBLEM TO BE SOLVED: To provide a seal device by which a part of an O-ring is prevented from being broken by being forced out when a working condition is under high temperature and high pressure, and in which stable sealing properties can always be obtained even under high temperature and high pressure. SOLUTION: In a seal device 30 in which a seal ring 36 and an O-ring 37 are mounted in an annular recessed groove 35, a positioning groove 38 by which the O-ring 37 is positioned in the approximately center part of the seal ring 36 is formed to a contact surface with the O-ring 37 in the seal ring 36 so that the O-ring 37 is always guided to be fallen in the positioning groove 38. |
