{TAIL ~ The valve} protects the ink in {HEAD ~ the ink supply} from contaminants that can migrate up the ink line during shut down periods 
{ TAIL ~ The valve } protects the ink in { HEAD ~ the ink supply } from contaminants that can migrate up the ink line during shut down periods
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH