| 摘要 |
PROBLEM TO BE SOLVED: To prevent the liq. from jetting. even if a trigger is pulled when a suction valve is opened by providing a suction valve opening and closing means to prevent the liq. from jetting due to mischief or the like except when desired. SOLUTION: A suction valve 15 is composed of a valve seat 17 provided on the inner face of a main cylinder 7 and a valve element 18 placed on the seat, a hanging part 20 is suspended from the lower part of the valve element, and an operating shaft piercing a through-hole 26 bored in the main cylinder 7 has an engaging position where the valve element 18 is engaged with the lower end of the hanging part 20 and raised to open the suction valve 15 and a disengaging position where the valve element is separated from the lower end of the hanging part 20 to open the suction vale 15. When the suction valve 15 is opened, even if the trigger 10 is pulled back, the liq. discharged into the main cylinder 7 from a cylinder 8 is returned into the vessel, and the liq. is not jetted from an injection cylinder.
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