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