A method, {HEAD ~ device}, and system for controlling {TAIL ~ a flow} of a fluid moving through a pipe are presented 
for controlling
A method , { HEAD ~ device } , and system for controlling { TAIL ~ a flow } of a fluid moving through a pipe are presented
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH