In the normal operation of {TAIL ~ the pump turbine apparatus} in {HEAD ~ the turbine or pump operation mode}, the fail safe valve 47 is held at the illustrated position by the force of a spring associated therewith 
In the normal operation of { TAIL ~ the pump turbine apparatus } in { HEAD ~ the turbine or pump operation mode } , the fail safe valve 47 is held at the illustrated position by the force of a spring associated therewith
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH