wrist plate

The exhaust valves are both opened and closed by the action of the wrist-plate and connecting rods.

When in operation, the bell-crank is rotated in the direction of the arrow by the action of the wrist-plate and connecting-rod.

The valve gear is of the regular Corliss type, driven by a single eccentric and wrist-plate.

M is a wrist plate pin by which the valve rod C can be released from the wrist plate.

The wrist plate or spider has a rocking motion, being driven by an eccentric rod from the engine-shaft.