| 摘要 |
PROBLEM TO BE SOLVED: To provide an air bypass valve which prevents foreign objects from entering into a valve inner part, closing a hole of a throttle part, and causing deterioration of the sliding ability of a piston and sealing failure of a seal member.SOLUTION: An air bypass valve 10 includes: a valve body 11; a valve body 12 mounted on the valve body 11; a piston part 13 incorporated into the valve body 12; and a pilot part 14 positioned on the piston part 13. A piston casing 15, which is fastened to an inner peripheral surface of the valve body 12 and has a stepped cylindrical shape, is provided in a state where at least three or more protrusions 21, which are provided in a circumferential direction and guide an outer peripheral surface of a piston 16 to a small diameter part 20 of the piston casing 15, are oriented to a longitudinal direction of the piston 16. |
