load pressure transducer means for measuring {HEAD ~ the pressure} in {TAIL ~ the supply line} between the restrictor and the pressure sensor and providing an output signal indicative thereof which is supplied to the control means; and 
in
load pressure transducer means for measuring { HEAD ~ the pressure } in { TAIL ~ the supply line } between the restrictor and the pressure sensor and providing an output signal indicative thereof which is supplied to the control means ; and
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH