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