Joy valve gear

Joy valve gear

Joy valve gear is a type of locomotive valve gear, Patented in 1870, where the movement is derived from a vertical link connected to the connecting rod. The vertical movement is translated into the horizontal movement required by the valve spindle by a die block moving in a slide which can be varied in inclination.

Joy gear was also used by John Fowler & Co. and several other steam traction engine manufacturers.

Designed by David Joy (1825–1903) Locomotive and Marine engineer, Joy valve-gear was used extensively on L&YR and LNWR locomotives, and also by the Manning Wardle-built narrow gauge 2-6-2 locomotives of the Lynton & Barnstaple Railway.

The last locomotives with Joy valve gear to remain in service with British Railways were the LNWR G2 and G2A classes, one of which is preserved.

References

* [http://www.lnwrs.org.uk/Glossary/glossaryj.php LNWR Society]
* [http://www.steamindex.com/people/joy.htm Biography of David Joy]

See also

* Extracts from the Diaries of David Joy: [http://www.steamindex.com/library/joydiary.htm]

* A software simulation of Joy - and other common valve gear configurations - is available for download from: [http://www.modeleng.org/software.htm]


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