In this manner the bearings are free to float with respect to the stem openings in the valve housing and thus maintain their precise alignment with the stem irrespective of {HEAD ~ inaccuracies} of {TAIL ~ the stem openings} existing in the rough casting either before or after an initial rough machining 
of
In this manner the bearings are free to float with respect to the stem openings in the valve housing and thus maintain their precise alignment with the stem irrespective of { HEAD ~ inaccuracies } of { TAIL ~ the stem openings } existing in the rough casting either before or after an initial rough machining
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