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