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Reply to "valve gear"

Big Jim, that link is only to a six-page table of contents.

Steam Punk, the combination lever was also known as "lap and lead lever." This is a hint to its function.

As the book describes it, the movement of the radius rod merges with the combination lever before that movement is transmitted to the valve stem and the valve. The bottom end of the combination lever has a backward and forward movement, in an arc, and this, when transmitted to the top of the lever in combination with the action of the radius rod at this point, imparts the required movement to the valve to keep the locomotive in operation. The combination lever acts on the valve in opposition to the crank when passing dead center.

Which I believe is a complicated way to say that the combination lever keeps the valve from getting into a position that would not allow steam to enter when the piston is at the far end of its stroke in either direction.

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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