When {HEAD ~ a filling level} of fuel reaches {TAIL ~ the closing part} 16, the latter is pressed against the valve seat 15 and closes the valve 11 
reaches
When { HEAD ~ a filling level } of fuel reaches { TAIL ~ the closing part } 16 , the latter is pressed against the valve seat 15 and closes the valve 11
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH