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