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Model Engineering Glossary: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Steam Engine Valve Gear

Over the years many different valve control systems have been designed for steam engines.

  • Allan valve gear: a straight-link valve gear. Invented by Alexander Allan in 1855, this combined the features of the Stephenson and Gooch gears. The reversing and cut-off functions were achieved by simultaneously raising the radius rod and lowering the link or vice-versa. The main advantage over the Stephenson valve gear was that it saved space as the performance was much the same as that of the Stephenson valve gear.
  • Bagnall-Price Valve Gear
  • Baguley Valve Gear
  • Baker Valve Gear - common in the United States, this valve gear has no sliding parts.
  • Bullied Chain-Driven Valve Gear
  • Caprotti Valve Gear
  • Grab Valve Gear
  • Gresley Conjugated Valve Gear
  • Heusinger Valve Gear
  • Hulcroft Valve Gear
  • Joy Valve Gear
  • Hugo Lentz
  • Piston Valve
  • Southern Valve Gear
  • Stephenson Valve Gear - used in early steam locomotives before Walschaerts valve gear took over, the most common valve gear used on traction engines.
  • Walschaerts Valve Gear - the most common valve gear on 20th century steam trains. Popular as all of the valve gear was outside the main frames so freeing up the space between the frames.

See also: Steam Engine, Steam Engine Performance.

Model Engineering Glossary: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z