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 the opening degree in {TAIL ~ respective operation modes} 
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 the opening degree in { TAIL ~ respective operation modes }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL