An actuation member is disposed within the body and responsive to a fluid pressure to cause {TAIL ~ the flow control member} to move between {HEAD ~ the first and second positions} 
An actuation member is disposed within the body and responsive to a fluid pressure to cause { TAIL ~ the flow control member } to move between { HEAD ~ the first and second positions }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD