a sealing portion disposed between {HEAD ~ the guide portion} and the tip portion and disposed adjacent {TAIL ~ the valve seat} and 
a sealing portion disposed between { HEAD ~ the guide portion } and the tip portion and disposed adjacent { TAIL ~ the valve seat } and
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH