PISTON STRUCTURE AND CONTROL VALVE

摘要

Disclosed is a piston structure (20) provided with a shaft (21), at least one disc-shaped flange (22) penetrated by the shaft (21), and an annular sealing member (23) outwardly projecting from the outer peripheral surface of the flange (22) in the radial direction and extending in the circumferential direction, wherein the flange (22) is provided with a pair of flange-like members (25) which hold the sealing member (23) therebetween from the opposite sides in the axial direction of the shaft (21). Therefore, it is possible to provide a piston structure wherein assembling and replacing can be easily performed.