{HEAD ~ The vent hole} is preferably closed between {TAIL ~ the tapping} of the intermediate pressure portion and the discharge pressure portion 
is preferably closed between
{ HEAD ~ The vent hole } is preferably closed between { TAIL ~ the tapping } of the intermediate pressure portion and the discharge pressure portion
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH