A main valve has a first chamber on one side downstream from the metering valve, and {HEAD ~ the valves outlet} is connected to {TAIL ~ this first chamber} 
is connected to
A main valve has a first chamber on one side downstream from the metering valve , and { HEAD ~ the valves outlet } is connected to { TAIL ~ this first chamber }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL