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 {HEAD ~ a servo motor} is switched to make {TAIL ~ the guide vanes} close at predetermined rates of change of the opening degree in 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 { HEAD ~ a servo motor } is switched to make { TAIL ~ the guide vanes } close at predetermined rates of change of the opening degree in 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH