Perhaps a bit above most folk. All its components were large, and the vast majority of them were out in the open on the side of the locomotive, in plain view; easy to maintain, and if anything were to go wrong, it would be obvious. New!! Here the rotary motion of the shaft was translated using gearing and cams to actuate four valves - a seperate inlet and exhaust valve for each side of the cylinder. 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. Although more expensive to manufacture than its rivals, this improved Caprotti valve gear is considerably more efficient than any other. Thanks to the 71000 Duke of Gloucester site at http://www.dukeofgloucester.co.uk/caprotti.html and a number of other sites for small details. It uses camshafts and poppet valves rather than the piston valves used in other valve gear. Type of steam engine valve gear invented in the early 1920s by Italian architect and engineer Arturo Caprotti. The restored Duke of Gloucester, with its flaws eliminated, has proved the concept. Caprotti Valve Gear On The GWR; Caprotti Valve Gear On The LMSR; Caprotti Valve Gear On The LNER; Hope Springs Eternal; Machines With Souls - British Culture And The Enduring Allure Of Steam Locomotives; Other; Latest News (External Link) 71000 âDuke of Gloucesterâ HOW IT WORKS by Peter Scarborough Updated with an account of the improvements made during the overhaul completed in 2004 By Dr Gary Shannon See more » BR Standard Class 5. Share. It uses camshafts and poppet valves rather than the piston valves used in other valve gear. Unlike other valve gears such as the Walschaerts and Stephenson types which used piston valves, the Caprotti type consisted of poppet valves, rotary camshafts, and closed mechanisms. 44686 and 44687 were fitted with a modified form of valve gear, with an external shaft on each side, driven by a worm gear mounted on a ⦠Benefits include much of the mechanism being enclosed thus leading to reduced wear and tear from the harsh steam locomotive environment and completely independent control of admission and exhaust. On the London Midland Region of British Railways the Class 8 4-6-2 Duke of Gloucester, No 71000, was built with Caprotti gear in 1954 and a further thirty 'Black Fives', Nos 73125-54, were built with it in 1956. The Caprotti valve gear is a type of valve gear that was invented in the early 1920s by Italian engineer and architectArturo Caprotti. The Walschaerts valve gear, for all its problems, was simple. The Caprotti gear was made of a multitude of small parts that had to fit to tight tolerances, hidden away in a box atop the cylinder. Caprotti valve gear is similar to these topics: Walschaerts valve gear, Expansion valve (steam engine), Gab valve gear and more. In addition, it was fitted to a large number o⦠25 page PDF booklet describing the Caprotti Valve Gear of BR Class 8P 4-6-2 Steam Locomotive No 71000 Duke of Gloucester - How it Works. Its main drawback was that for heavy-duty, low maintenance, service it ⦠In addition, it was fitted to a large number of export locomotives, for India in particular, from the North British Locomotive Company among others. The British Railways Standard Class 5MT 4-6-0 was one of the 12 standard classes of steam locomotive built by British Railways in the 1950s. British Caprotti valve gear: lt;p|>The |Caprotti valve gear| is a type of |steam engine| |valve gear| invented in the early 19... 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