For {HEAD ~ example} in {TAIL ~ one embodiment}, the valve seat is dome shaped with the top of the dome truncated or sliced off 
in
For { HEAD ~ example } in { TAIL ~ one embodiment } , the valve seat is dome shaped with the top of the dome truncated or sliced off
OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH