The manufacture of 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 {TAIL ~ aligned position} by filling the voids between the bushings and {HEAD ~ the walls} of their openings with the same elastomeric compound from which the valve seat is molded 
The manufacture of 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 { TAIL ~ aligned position } by filling the voids between the bushings and { HEAD ~ the walls } of their openings with the same elastomeric compound from which the valve seat is molded
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