An actuator rod is axially movable by the diaphragm in {TAIL ~ response} to {HEAD ~ a predetermined pressure} in the cavity 
An actuator rod is axially movable by the diaphragm in { TAIL ~ response } to { HEAD ~ a predetermined pressure } in the cavity
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH