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