| 摘要 |
PROBLEM TO BE SOLVED: To solve some problems found in conventional fire power adjustment devices that when a liquid substance such as boiled-over dew drips on a slot-shaped guide part formed at a main body, the liquid substance is flowed along a clearance part between the guide part and a circumferential surface of a needle valve and enters the main body because an engaging pin is guided by the guide part to advance or retract the needle valve 5, resulting in the prevention of a motion of the needle valve.SOLUTION: An operator's side end part of a needle valve 5 is completely exposed out of a main body 2 to minimize the possibility that a liquid substance enters the main body 2 even if the liquid substance is dripped down to the operator's side end part of the needle valve 5. Further, since a slot-shaped guide part is eliminated, a plate-like guide plate 4 is fixed to the main body 2 and a slit-like guide part 41 is formed at the guide plate 4. |
