Seal Device

Abstract: This seal device comprises an annular seal ring centered on a seal axis, and a seal holding ring for holding the seal ring. The seal holding ring has an annular holding groove recessed radially inward. The seal ring has a contact surface that can come into contact with a low-pressure side groove side surface in the axial direction among surfaces that define the holding groove. The seal ring is divided into four or more in a circumferential direction with respect to the seal axis. The thrust load center radius is a radial distance between the seal axis and a thrust load center which is an intermediate position between the radially outer end of the contact surface and the position most radially inward in the seal ring. The inner end radius is the radial distance between the seal axis and the most radially inner end of the contact surface. The ratio of the inner end radius to the thrust load center radius is 1.20 or less.

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