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