Also, to conserve the number of solenoid valves needed, the system in one embodiment places a check valve in {HEAD ~ a split} in a line that supplies pressure to the cassette sealing bladder and {TAIL ~ occluder bladders}, such that the occluder bladder cannot steal positive pressure from the cassette sealing bladder 
Also , to conserve the number of solenoid valves needed , the system in one embodiment places a check valve in { HEAD ~ a split } in a line that supplies pressure to the cassette sealing bladder and { TAIL ~ occluder bladders } , such that the occluder bladder can not steal positive pressure from the cassette sealing bladder
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