| 摘要 |
PROBLEM TO BE SOLVED: To reduce a reaction force at the time of charge action than before. SOLUTION: The second gas circulation control means composed of a check valve 21 which makes an insulation gas flow from the expansion chamber 13 side into the buffer room 6B side when a pressure of expansion chamber 13 is higher than that of a buffer room 6B is mounted on a stationary piston 7.
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