A switch valve for use in an extracorporeal blood flow circuit comprises a valve housing having a chamber, four openings communicating with the chamber, and {HEAD ~ a valve member} located in {TAIL ~ the valve chamber} 
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A switch valve for use in an extracorporeal blood flow circuit comprises a valve housing having a chamber , four openings communicating with the chamber , and { HEAD ~ a valve member } located in { TAIL ~ the valve chamber }
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL