A floating valve assembly, operated by the shaft and aligned by the shaft, is mounted on the outside of the housing on projections which flexibly support {HEAD ~ a valve stator} containing {TAIL ~ vacuum ports} 
containing
A floating valve assembly , operated by the shaft and aligned by the shaft , is mounted on the outside of the housing on projections which flexibly support { HEAD ~ a valve stator } containing { TAIL ~ vacuum ports }
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL