In a contemplated design employing such a seal post 502 and ring 504, as the valve 345 articulates or moves outwardly from the fully recessed position illustrated in dashed lines in FIG 14 to a more outwardly position, the periphery of the valve central wall 370 and portion of the skirt 374 may tend to be compressed slightly in {HEAD ~ the radially inwardly direction} to accommodate {TAIL ~ the movement} of the valve 345 
to accommodate
In a contemplated design employing such a seal post 502 and ring 504 , as the valve 345 articulates or moves outwardly from the fully recessed position illustrated in dashed lines in FIG 14 to a more outwardly position , the periphery of the valve central wall 370 and portion of the skirt 374 may tend to be compressed slightly in { HEAD ~ the radially inwardly direction } to accommodate { TAIL ~ the movement } of the valve 345
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