In intermediate positions the guide vane deflects the in flowing stream of water toward {TAIL ~ the frusto conical wall} so that the water, when the pressure head exceeds {HEAD ~ a certain valve}, is caused to rotate about the axis of the housing to produce the desired brake effect 
In intermediate positions the guide vane deflects the in flowing stream of water toward { TAIL ~ the frusto conical wall } so that the water , when the pressure head exceeds { HEAD ~ a certain valve } , is caused to rotate about the axis of the housing to produce the desired brake effect
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH