The second current {HEAD ~ to pressure converter} is disposed in pneumatic signal transmitting relation to {TAIL ~ the controllable depressurizing valve} means 
The second current { HEAD ~ to pressure converter } is disposed in pneumatic signal transmitting relation to { TAIL ~ the controllable depressurizing valve } means
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH