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The Stephenson valve gear or Stephenson link or shifting link [1] is a simple design of valve gear that was widely used throughout the world for various kinds of steam engines. It is named after Robert Stephenson [ 2 ] but was invented by his employees.
Stephenson valve gear - most common valve gear in the 19th century, normally inside the locomotive frame. William T. James valve gear 1832, used first by Baltimore and Ohio Railroad, United States. Allan valve gear, a straight-link valve gear. It is fitted to 0-4-0WT "Dolgoch", preserved on the Talyllyn Railway.
Developments after the separate expansion valve led to more sophisticated valve gears that could achieve the same goal of varying inlet lap with a single valve. The first of these were the link valve gears, particularly the Stephenson link valve gear. This uses a pair of eccentrics with a sliding link mechanism between them that acts as a ...
The Stephenson valve gear remained the most commonly used valve gear on 19th-century locomotives. However, the Walschaerts valve gear had the advantage that it could be mounted entirely on the outside of the locomotives, leaving the space between the frames clear and allowing easy access for service and adjustment, which resulted in it being ...
The valve gear used was the Stephenson valve gear which was fitted inside the frames. [2] The grate was fitted between the two driving wheels. The diameter of the driving wheels necessitated splashers to be fitted over the wheels. A small pilot was fitted to the locomotive's buffer beam. The cab was enclosed, with the cab's rear wall being ...
The valve gear was also converted from Stephenson to Walschaert, which was becoming common on modern locomotives. All four members were renumbered Union Pacific 3200-3203, with No. 197 becoming No. 3203; at that time, the OR&N had been previously merged (in 1910) into by Oregon-Washington Railroad & Navigation Company, a subsidiary of Union ...
Among the Big 4, only Fox was down by double digits — and that can be explained by the fact that it ran the Super Bowl in 2023, so of course it’s going to be down. In cable, unless you were a ...
The special valve gear operated four slide valves for each cylinder, two of which were worked by Stephenson valve gear, but used for reversing only, and two more, on top of the first two, for controlling the cutoff, these being operated by a third eccentric through a rocking lever with a sliding block on one arm.