The method 12, comprising, when the closure member is open, releasing {HEAD ~ a pressure fluid} through {TAIL ~ the vent valve} from a conduit extending between the trip control valve to the actuator diaphragm 
through
The method 12 , comprising , when the closure member is open , releasing { HEAD ~ a pressure fluid } through { TAIL ~ the vent valve } from a conduit extending between the trip control valve to the actuator diaphragm
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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