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