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