The modulating pressure relief valve means provides, in combination with the flow restricting means, dual preselected modulated increases in fluid pressures in the respective upstream and downstream conduits and also the respective selected first and second force transmitting {TAIL ~ mechanisms} in response to each of the selector valve means initially directing pressurized fluid to their respective selected force transmitting {HEAD ~ mechanisms} 
The modulating pressure relief valve means provides , in combination with the flow restricting means , dual preselected modulated increases in fluid pressures in the respective upstream and downstream conduits and also the respective selected first and second force transmitting { TAIL ~ mechanisms } in response to each of the selector valve means initially directing pressurized fluid to their respective selected force transmitting { HEAD ~ mechanisms }
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD