Seal device

Abstract

A seal device where, even if a fluid to be sealed is under high pressure, a seal surface of a seal ring is prevented from producing heat and the seal surface is prevented from wearing. The seal device has a first seal ring () having a first seal surface (A) at an end surface and having, on the opposite side of the first seal surface (A), a first pressing surface (B) formed on an inclined surface: a first seal retainer () having a first inner periphery fixation surface (A) facing the first pressing surface (B); a first elastic seal ring () for pressing the first pressing surface (B) in an axial direction by elastic force produced by sealed compression between the first pressing surface (B) and the first inner periphery fixation surface (A); a second seal ring () in tight contact with the first seal surface (A) of the first seal ring () and having a second seal surface (A) slidable relative to the first seal surface (A); and a second seal retainer () in which the second seal ring () is sealedly held. The first pressing surface (B) is formed as an inclined surface where the ratio H/L is in the range not exceeding 0.5, with H being the width in a radial direction, L the length in the axial direction of the first pressing surface (B).