The controller varies the output pressure of {TAIL ~ the pressure source}, {HEAD ~ e.g. a rotary compressor}, based, at least in part, on the head position information provided by the head position sensor 
The controller varies the output pressure of { TAIL ~ the pressure source } , { HEAD ~ e.g. a rotary compressor } , based , at least in part , on the head position information provided by the head position sensor
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH 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