| 摘要 |
PURPOSE: An unlock prevention valve is provided to prevent the malfunction of the valve by restricting the movement of a rotary handle within a fixed range. CONSTITUTION: An unlock prevention valve comprises a body(10), a first side plate(20), a second side plate(30), an insertion bar(40), a valve unit(50), a fixing ring(60), a rotary handle, and a spring(80). The body has a body(12) and an extension part(14). The first side plate is coupled to an end of the body. The second side plate is coupled to the other end of the body. The insertion bar comprises a protruding male thread part(46) to which the extension part is inserted. The valve unit allows or blocks the connection of a first through hole and a second through hole according to the rotation of the insertion bar. In the fixing ring, a fixed male thread part(64) is coupled to the female thread part of the extension part and fixes the location of the insertion bar. In the rotary handle, an arc projection is inserted into an arc groove(144) of the extension part and is moved only within the arc groove in order to limit the rotation range. The spring prevents the rotation of the rotary handle even in the event of vibration.
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