Preferably, the compressor includes a delivery control mechanism responsive to {HEAD ~ pressure} in {TAIL ~ the suction passageway} to vary the effective cross sectional area of the suction passageway 
in
Preferably , the compressor includes a delivery control mechanism responsive to { HEAD ~ pressure } in { TAIL ~ the suction passageway } to vary the effective cross sectional area of the suction passageway
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH