{HEAD ~ The manufacture} of {TAIL ~ a butterfly valve} is described in which the stem openings for the valve are left in their as cast condition, the stem bushings inserted, aligned with a stem replica and then permanently locked in aligned position by filling the voids between the bushings and the walls of their openings with the same elastomeric compound from which the valve seat is molded 
of
{ HEAD ~ The manufacture } of { TAIL ~ a butterfly valve } is described in which the stem openings for the valve are left in their as cast condition , the stem bushings inserted , aligned with a stem replica and then permanently locked in aligned position by filling the voids between the bushings and the walls of their openings with the same elastomeric compound from which the valve seat is molded
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