wedge valve gear

wedge valve gear

A type of valve gear designed by Isaac Dodds, dating from 1839 and used occasionally until 1872, which had two eccentrics on a two-cylinder locomotive instead of four. The single eccentric for each cylinder was changed from forward to reverse by drawing a wedge along a square section of the axle through the sheave to adjust its eccentricity. The design failed because of the difficulty of keeping the wedges properly adjusted.

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