In {TAIL ~ one aspect}, {HEAD ~ the invention} is a device for controlling a flow of a fluid moving through a pipe 
In
In { TAIL ~ one aspect } , { HEAD ~ the invention } is a device for controlling a flow of a fluid moving through a pipe
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH