{HEAD ~ The edge} of {TAIL ~ the partial ball} is characterized by having a v notch to obtain desired valve characteristics as well as to provide shearing actions at the sharp edges of the valve as it closes 
of
{ HEAD ~ The edge } of { TAIL ~ the partial ball } is characterized by having a v notch to obtain desired valve characteristics as well as to provide shearing actions at the sharp edges of the valve as it closes
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH