A sealing device for hydraulic equipment according to the invention includes an outer member having an annular shape, an inner member inserted into the outer member, and a seal ring housed in an annular groove disposed in the outer circumference of the inner member and abutting on the outer member to prevent a liquid from passing through a gap between the outer member and the inner member. The annular groove of the inner member has a bottom portion including a recess for restraining axial displacement of the seal ring relative to the annular groove.

The present disclosure relates to a body valve assembly and a shock absorber including the same. The body valve assembly includes a body valve main body that adjusts a movement of a working fluid between a compression chamber and a reserve chamber, a body pin having a body injection flow channel in communication with the compression chamber formed therein, a body pilot housing having a body pilot chamber in communication with the body injection flow channel formed therein, a free piston coupled to the body pin so as to move axially when a pressure of the body pilot chamber is higher than a preset pressure, and a pilot disc mounted on the body pin while being in contact with the free piston, wherein an end surface of the free piston facing the pilot disc has a plurality of points having different vertical levels.

A shock absorber includes a first passage (92) through which a working fluid flows out from a chamber that is an upstream side to a chamber (23) that is a downstream side due to movement of a piston (21), a first damping force generating mechanism (41) provided in the first passage (92) to generate a damping force, a second passage (182) provided separately from the first passage (92), a second damping force generating mechanism (183) provided in the second passage (182) and opened to generate a damping force when a piston speed is lower than that of the first damping force generating mechanism (41), a third passage (512) provided separately from the second passage (182), a volume variable mechanism (186) provided in the third passage (512), a fourth passage (521) provided separately from the third passage (512), and a relief mechanism (522) provided in the fourth passage (521) and opened after the second damping force generating mechanism (183) is opened.

A shock absorbing apparatus according to the present disclosure may comprise a block having a through hole vertically penetrating the block, and a first flow path, a second flow path, and a third flow path; and a first tube extending vertically through the through hole and having a penetration portion that penetrates an inner circumferential surface and an outer circumferential surface of the first tube so that an interior of the first tube is in fluid communication with the first flow path.