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London & North Western Railway Society
Glossary for the LNWR Society

Glossary Results for Word "Allan Valve Gear"

Allan Valve Gear A form of valve gearExplain 'Valve Gear' patented by Alexander Allan in 1859 when Locomotive Superintendent of the Scottish Central RailwayExplain 'Scottish Central Railway (SCR)' at Perth and also known as ‘straight link’ motion. Movement is derived from eccentricsExplain 'Eccentric' on the driving axleExplain 'Drive Axle'. Generally similar to the Stephenson gearExplain 'Stephenson’s Valve Gear' but the valve-rodExplain 'Valve Rod' is raised as the link is lowered and the link itself is straight, whereas on the Stephenson gear it is curved. Allan valve gear was used by WebbExplain 'Webb, Francis William (1836—1906)' for many of the passenger engines used on the LNWR.