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