The closure of tapered slits 2 insures that {HEAD ~ no air} passes through {TAIL ~ the opening} 70 of cap 17 and through valve body 1 into passage 11 
passes through
The closure of tapered slits 2 insures that { HEAD ~ no air } passes through { TAIL ~ the opening } 70 of cap 17 and through valve body 1 into passage 11
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH