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