The second valve is provided in {HEAD ~ the second connection passage} to open and close {TAIL ~ the second connection passage} 
to open
The second valve is provided in { HEAD ~ the second connection passage } to open and close { TAIL ~ the second connection passage }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL