In {TAIL ~ the absence} of an open configuration of {HEAD ~ the second valve apparatus, fluid pressure increases} in the second flow path 
In { TAIL ~ the absence } of an open configuration of { HEAD ~ the second valve apparatus , fluid pressure increases } in the second flow path
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH