Making {HEAD ~ the cross sectional shape} of {TAIL ~ the channel} 46 a segment of a true circle also contributes to the functional characteristics of the valve 
Making { HEAD ~ the cross sectional shape } of { TAIL ~ the channel } 46 a segment of a true circle also contributes to the functional characteristics of the valve
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH