To conserve the number of valves, {HEAD ~ the system} in one embodiment uses {TAIL ~ a three way valve} to supply pressurized air to either a positive pressure tank for operating the fluid pumps or to a line that supplies a cassette sealing bladder and a tubing pumping occluder bladder 
uses
To conserve the number of valves , { HEAD ~ the system } in one embodiment uses { TAIL ~ a three way valve } to supply pressurized air to either a positive pressure tank for operating the fluid pumps or to a line that supplies a cassette sealing bladder and a tubing pumping occluder bladder
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH