As used herein a v notch ball valve is a valve in which the ball has been modified so that {HEAD ~ only a portion} of {TAIL ~ the ball} is used 
of
As used herein a v notch ball valve is a valve in which the ball has been modified so that { HEAD ~ only a portion } of { TAIL ~ the ball } is used
OTH OTH OTH OTH OTH OTH 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 OTH OTH