| 摘要 |
PROBLEM TO BE SOLVED: To provide a piston attaching-detaching tool of a control valve for smoothly attaching-detaching (extracting and inserting) a piston of the control valve. SOLUTION: This attaching-detaching tool 8 is composed of a screw part 8A threadedly engaging with a female screw 2A of the piston 2, an air vent 8B formed up to a side end part of the screw part 8A from a head part, and communicating with an air vent 2B of the piston 2, and a knob part 8C.
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