TheBaguley valve gear is a type ofsteam enginevalve gear invented byErnest E. Baguley, the Chief Draughtsman of theW.G. Bagnall company oflocomotive manufacturers and patented in 1893.[1] It was used by Bagnall during Baguley's time there, then by his own company ofBaguley Cars Ltd.[1][2]
Thevalve gear was invented byErnest E. Baguley, the Chief Draughtsman of theW.G. Bagnall company oflocomotive manufacturers and patented in 1893.[1] A modified version was introduced in 1895 which eliminated a curved link.[1]
Following Baguley's departure from Bagnall's in 1901 that company developed theBagnall–Price valve gear which was primarily based onWalschaerts valve gear. Baker identifies one common feature retained from Baguley in Bagnall–Price: "the application of the lap and lead motion by oscillating the expansion link (or sector) bodily, and thus superimposing this motion on the. normal die block travel, the lead remaining constant in all positions of the gear."[2]
Baguley formed his own company,Baguley Cars Ltd, in 1911, which constructedinternal combustion engine vehicles.[1] In 1920 a petrol-hydraulic engine, works No. 621, which had been started in 1914 but delayed byWorld War One, was completed as an0-4-0ST steam locomotive works No. 2001 with original Baguley valve gear, the only standard gauge locomotive to ever be so fitted.[1] The Company went on to complete 30 more steam locomotives through to 1928 all of which were fitted with Baugley value gear, mostly the modified variant.[3]
The valve gear is used to operate the inlet and outlet valves ofreciprocating steam locomotives. It uses arocking sector whose motion is driven via a link from acrankpin between thecoupling andconnecting rods. The ends of this link are circular and offset from thepivots. On these circular bosses the sector is oscillated by a second link from the rod to an extension to the rear of the sector.[citation needed]
Only a few locomotives with Baguley valve gear remain, the list is known to include:
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