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