Duke of GloucesterCaprotti valve gear on BR no. 73129
The Caprotti valve gear is a type of steam engine valve gear invented in the early 1920s by Italian architect and engineer Arturo Caprotti. It uses camshafts and poppet valves rather than the piston valves used in other valve gear. While basing his design on automotive valves, Caprotti made several significant departures from this design to adapt the valves for steam. Having agreed a joint-venture with Worcester-based engineering company Heenan & Froude from 1938, Heenan & Froude fully acquired Caprotti post-World War II in 1947.
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The Caprottivalvegear is a type of steam engine valvegear invented in the early 1920s by Italian architect and engineer Arturo Caprotti. It uses camshafts...
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locomotives of the LMS Stanier Black Five type, fitted with Caprottivalvegear, in 1948; the BR Caprotti Black Fives. These were numbered 44738-57, 44686 and...
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across the class was the valvegear, with 142 using Walschaerts valvegear and the remaining 30 using British Caprottivalvegear. There was little difference...
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(the "cut-off") using the reversing gear and this reduces steam usage under cruising conditions. Caprottivalvegear is more closely related to that of...
been used on steam locomotives, often in conjunction with Lentz or Caprottivalvegear. British examples include: LNER Class B12 LNER Class D49 LNER Class...
trip valvegear while in railway locomotives a valvegear such as Caprotti is used. It was invented around 1800 by Jonathan Hornblower. His valve is in...
Gab valvegear was an early form of valvegear used on steam engines. Its simplest form allowed an engine to be stopped and started. A double form, mostly...
locomotives for the Central Argentine Railway (F.C.C.A) in 1930, with Caprottivalvegear and modern boilers. They were the most powerful locomotives on the...
fitted with Caprottivalvegear. 73129 was outshopped from Derby Works in August 1956. It was one of 30 built fitted with Caprottivalvegear. Originally...
Arturo Caprotti (22 March 1881 – 9 February 1938) was an Italian engineer and architect. In 1915 or 1916 he invented the Caprottivalvegear rotary cam...
were rebuilt by the LMS with larger boilers, and ten of these had Caprottivalvegear. Twelve others were rebuilt as the initial engines of the Patriot...
longer boiler. Of the latter, 30 were built from the beginning with Caprottivalvegear, after it had been tested first on a FS Class 740 locomotive and...
A safety valve is a valve that acts as a fail-safe. An example of safety valve is a pressure relief valve (PRV), which automatically releases a substance...
poppet valve fitments (such as Class B12), Gresley chose to use Caprottivalvegear. This was driven from the driving axle by a longitudinal shaft along...
built, bringing the total to 2,941, was a BR standard class 5 with Caprottivalvegear, number 73154. In 1948 the first British main-line diesel electric...
Instead of Caprottivalvegear system of ZF class, the ZF1 class Locomotives were based on improved design with Walschaerts valvegear. The years 1976–1977...
trialled on #5699 was its use of Caprottivalvegear, a poppet valvegear invented in Italy. The greater efficiencies of this gear gave the locomotive a higher...
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