Bagnall–Price valve gear

Bagnall–Price valve gear is a type of steam engine valve gear developed at locomotive manufacturer W.G. Bagnall as an alternative to the more common Walschaerts valve gear. The gear was patented in 1903 by W.G. Bagnall and T. S. Price, the manager of the works.[1]

Layout
Schematic diagram showing the major components of the Bagnall–Price valve gear
Bagnall–Price valve gear on an 18 in gauge Bagnall product at the Kimberley diamond mine museum, South Africa

The valves are driven from an eccentric cam mounted on one of the driving axles and linkage from the crosshead. The driving axle cam drives a rocking shaft that is mounted inside a cylindrical sleeve (known as the rocking shaft bush) above the cylinder. A drop lever and connecting link from the crosshead oscillates the sleeve to control the lap and lead of the cylinder.[2]

Comparison to Walschaerts

W.G. Bagnall claimed that Bagnall–Price valve gear eliminated some of the complexity of the Walschaerts gear, specifically the combination lever and return gear; this in turn meant the externally mounted gear had greater ground clearance which was an advantage in industrial locations where lineside obstructions could damage the gear of passing locomotives.[3]

gollark: > are they thoyes.> 40 years for us to figure out mass recycling idkI mean, maybe, but you still have to go out to the deserts and replace all of them, and they'll slowly degrade in effectiveness before that.
gollark: I think because the main advantage was that it wouldn't produce neutrons in some sort of fusion reaction, and neutrons cause problems, except it still would because of the fuels each fusing with themselves.
gollark: I think I read somewhere that it wasn't very useful (he3) but i forgot why.
gollark: I too want vast swathes of land to be covered in generators which will not even work half the time because of "night" and "poor weather", which are hilariously energy-expensive to produce in the first place, and which will break after 40 years.
gollark: I mean, in a sense, maybe it is.

References
  1. "Bangall locomotive valve gears". Retrieved 27 January 2015.
  2. Baker, Allan C. (1966). "Bagnall Locomotive Valve Gear". The Industrial Railway Record. 11: 264–270.
  3. "Side Tank Locomotive 3050". Retrieved 27 January 2015.
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