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