To conserve {HEAD ~ the number} of {TAIL ~ valves}, the system in one embodiment uses 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 
of
To conserve { HEAD ~ the number } of { TAIL ~ valves } , the system in one embodiment uses 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 HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH