| 摘要 |
PROBLEM TO BE SOLVED: To provide a sealing device, of which sealing member is not suscep tible to deformation at the time of operation under ultra high pressure, which is excellent in property for eccentricity following-up and can surely seal an inner circumferential face of a cylindrical portion of a piston. SOLUTION: An approximately cylindrical resin seal 4 is disposed to an outer peripheral portion of an outward flange portion 2c of a cancel plate. An outer peripheral face 4a of the resin seal 4 is a slide-contact face with the cylindrical portion 10a of the piston. An elastic portion 3 is disposed to press the resin seal 4 in a direction of enlarging the diameter. |
