The formed welded unit may then be placed in {HEAD ~ a mold} that consists of {TAIL ~ two halves} to facilitate formation of an internal flexible membrane that defines part of the valve 
consists of
The formed welded unit may then be placed in { HEAD ~ a mold } that consists of { TAIL ~ two halves } to facilitate formation of an internal flexible membrane that defines part of the valve
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH