When the wire is cut off accidentally, the weight drops onto the operation rod to depress the latter to switch the change over valve so that a servo motor is switched to make the guide vanes close at predetermined rates of {HEAD ~ change} of {TAIL ~ the opening degree} in respective operation modes 
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When the wire is cut off accidentally , the weight drops onto the operation rod to depress the latter to switch the change over valve so that a servo motor is switched to make the guide vanes close at predetermined rates of { HEAD ~ change } of { TAIL ~ the opening degree } in respective operation modes
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