| 摘要 |
PURPOSE:To provide a structure by which continuous deterioration of sealing performance in an abutment can be prevented. CONSTITUTION:In a piston seal, in which a piston is sealed by jointing end parts 11, 12 constituting abutments of a seal ring 10 together, the first engaging part. 11a formed in one end part constituting the abutment and the second engaging part, 12a, which is formed in the other end part, constituting the abutment and is engaged with the first engaging part 11a in the predetermined position, are provided.
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