The system also includes a pressure differential switch which senses {HEAD ~ a drop} in {TAIL ~ pressure} across a pedal valve 
in
The system also includes a pressure differential switch which senses { HEAD ~ a drop } in { TAIL ~ pressure } across a pedal valve
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH