Preferably, the valve member is compressed within the chamber to provide the resilient bias required to move {HEAD ~ the valve member} into {TAIL ~ sealing engagement} with the valve seat 
Preferably , the valve member is compressed within the chamber to provide the resilient bias required to move { HEAD ~ the valve member } into { TAIL ~ sealing engagement } with the valve seat
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 OTH OTH OTH OTH