To conserve the number of valves, the system in {HEAD ~ one embodiment} uses a three way valve to supply {TAIL ~ 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 
To conserve the number of valves , the system in { HEAD ~ one embodiment } uses a three way valve to supply { TAIL ~ 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
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