(See Wikipedia article for more information). It was found that the Caprotti-fitted locomotives were more economical on coal and water than those with Walschaerts valve gear, but it was later found that some of the losses of the Walschaerts locomotives was due to leakage of steam past the valve heads, where a single wide ring was used. In August 1926, the London, Midland and Scottish Railway equipped four-cylinder 4-6-0 locomotive no. Download PDF Info . This web publication contains 147,919 pages of I do know something that those of (you) who follow Guatemalan railroads do not, (and) I respectfully say that it is more likely that. To allow room for the firebox between the middle and rear axleboxes the spacing between the driving and rear coupled wheels was increased from 8ft (2.4m) to 8ft 4in (2.5m). The restored Duke of Gloucester, with its flaws eliminated, has proved the concept. Further Methods of Distributing Steam to the Cylinders. 1927 William Beardmore and Co acquired sole license rights for manufacture and sale of Caprotti Valve Gear in the U.K.[2]. The Caprotti valve gear is a type of steam engine valve gear invented in the early 1920s by Italian architect and engineer Arturo Caprotti. All material Copyright SteamLocomotive.com, Very nice animation of Walschaerts valve gear. Simulation confirms its complexity in arriving at valve events predictably similar to Walschaerts yet more costly to produce. DON ASHTONS STEAM LOCOMOTIVE VALVE GEARS. and ease of use. Caprotti valve gear Updated on Jul 14, 2022 Edit Like Comment The Caprotti valve gear is a type of steam engine valve gear invented in the early 1920s by Italian architect and engineer Arturo Caprotti. How Variable Valve Actuation Works. In the long run for 71000 to have new rollers on her and new tyres for its driving wheels , And the caprotti valve gear to new parts to say only 2 locos survive with caprotti valves the other 73129. Specification: Tractive effort: 26120lbs Cylinders: 2 (outside - 19" x 28"stroke) Driving Wheels: 6ft 2ins Boiler pressure: 225 psi Valve Gear: 'Caprotti' Total weight: Loco 76tons 0cwt Number Built: 30 Caprotti valved (Class Total 172) 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. Those of the Hackworth family, most purporting to obviate the necessity for producing a curved slot or guide, are inferior despite the ingenuity employed, and Joy gear which retains the curved guide had the most popularity. The error 114: Worsted trimmings Details of preparation . It was made Typical of railway locomotive history, poppet valves are yet another example of hoping to achieve dramatic overall improvement by the inclusion of a single item, be it a water feed heater, condensing system, exhaust injector or whatever. Please await loading. Allan gear employs a straight link slot and can reduce any tendency to excessive lead variation but otherwise introduces more complication. and characteristics of any of the types of valve gear supported. and then used ImageMagick to The timing distortions of rotary to linear motion and vice versa are similarly present in all swinging arms and rockers - an arc is simply part of a circle and the same principle applies to both. The Caprotti valve gear is a type of steam engine valve gear invented in the early 1920s by Italian architect and engineer Arturo Caprotti. This latter is apparently evident amongst model engineers, who seem to have a hatred of curved links and it has to be admitted that manufacturing these to a fine tolerance can be taxing. download the ZIP files into the folder. Until the 1930s it was fitted on some 334 FS locomotives and on 77 narrow-gauge locomotives . Commons Attribution-ShareAlike License. I, the author accept no responsibility for any claim arising 2) The Journal of the Institution of Locomotive Engineers Vol XV, No 68, Jan-Feb 1925, Pages 86-119. 1) Handbook for Railway Steam Locomotive Enginemen; Ian Allan; ISBN 0 7110 0628 0. The Black Fives had been fitted with Walschaerts valve gear as standard. New piston valves having several narrow rings were fitted to one locomotive, and it was then found that the Walschaerts valve gear could be just as economical as the Caprotti, but with considerably less cost of fitment. In 1947, as part of an experimental programme by George Ivatt to try to improve the already good design, (4)4767 was built with . controls the timing or duration of time boiler pressure steam is allowed It probably suffers more than the primary gears where longer valve travels are required and consequently died a death early in the 20th century. Thought I'd go one more and zoom in even more: Glad to see this blow-up, and yes, it looks like a poppet-valve job--my original guess looking at the original photo posting was wrong, looking at it here reveals the cylinder block is one meant for this application, not a modified slide valve job. Examples caprotti equipped standard five , based at midland railway centre butterley to valgr10m.zip. A CLOSE-UP of the Baker valve gear applied to a New York Central fast freight locomotive.This gear was invented in 1903 and first used on a traction engine. Does any one here have any info on that loco or its Sales Order clones? that it quickly became the most popular valve gear on steam locomotives. Although more expensive to manufacture than its rivals, the improved Caprotti valve gear is considerably more efficient than any other. In the USA it quickly became Prior art keywords cam engine cams shaft valve Prior art date 1925-10-06 Legal status (The legal status is an assumption and is not a legal conclusion. Here is the Baldwin builder's photo of IRCA 152 from the Broadbelt Collection. Set-26 degrees. British Caprotti valve gear designed by Associated Locomotive Equipment in the 1950's for Steam Locomotives improved on the original 1920's. Bar") in the cab. Or make for use with the metric system. valve gear but did not become popular until the very late 1800's. The British Caprotti valve gear was a new development of Caprotti valve gear by the Associated Locomotive Engineers, under the leadership of L.A. Daniels . Their supremacy was never destined to be endangered. Results were mixed, with the performance of the Duke of Gloucester being particularly disappointing. Charles J Dockstader. stroke which would allow the steam to expand throughout the "expansion" The Caprotti valve gear is a type of valve gear that was invented in the early 1920s by Italian engineer and architect Arturo Caprotti. RM P67RN3 - One of the Caprotti valve gear Standard 5 4-6-0s working turn about with the Gresley A4s on the Glasgow-Aberdeen services during the 1960s. The Caprotti valve gear is a type of steam engine valve gear invented in the early 1920s by Italian architect and engineer Arturo Caprotti. The short lifting arms attempting to produce this action by ratio are ill-fitted to suspend the valve gear, through two conflicting lifting links, in any decent manner. Expired . British Caprotti Valve Gear. Feb 2, 2007 at Bitter Creek Western RR. It uses camshafts and poppet valves rather than the piston valves used in other valve gear. Caprotti 5 Stock Photos and Images. This page has been re-styled a little by Bill Purvis. The first batch of Caprotti Black Fives, M4748M4750, emerged from Crewe in February 1948. The Caprotti valve gear was first tested on a Ferrovie dello Stato Italiane Class 740 2-8-0 mixed-traffic locomotive in 1921; although more expensive and complicated than the standard piston valves, it substantially improved the locomotive's performance. 1930 Loco and Car Cyclopedia, page 1392, IRCA, 2-8-2, (it was also built to run at 175psi. Perhaps its culmination is the fascinating reversible single eccentric applied to a German 4-axle outside-hung V8, a simple illustration of which leaves the mind wondering until viewing the short video. Caprotti valve gear invented by Arturo Caprotti, an Italian engineer, and gained some popularity in mid-20th century European locomotive designs. The locomotives with plain bearings also had the longer wheelbase. less dynamic loads on the main driver. Save up to 30% when you upgrade to an image pack Stock photos, 360 images, vectors and videos Enterprise Lightboxes Cart Hi there! Baker valve gear, originally designed for traction engines, enjoyed some success in its home environment, America. locomotive from rest, boiler pressure steam would need to be admitted That was later found to be due to errors elsewhere in the design and construction of the locomotive. Windows XP will unzip. I am sad I never made it down when they were running. British Caprotti Valve Gear on the Duke of Gloucester, https://en.wikipedia.org/w/index.php?title=Caprotti_valve_gear&oldid=1017135438, This page was last edited on 11 April 2021, at 01:20. being cut off earlier in the stroke. a steam locomotive. Caprotti was an engineer with experience of automobileengineering, and he sought to apply and adapt the principles of the valves commonly used on the internal combustion engineto the steam engine. This simulation shows it prepositioned at -26 degrees from the mid position. The twenty locomotives incorporated a number of modifications to the original design. Tests with the first two locomotives demonstrated a saving in coal of 16 percent. 4473844747. They were fitted with Caprotti valve gear, raised running plates without splashers, a double chimney and roller bearings on all axles. The large steam pipes are an obvious visual recognition feature. [1], On the London and North Eastern Railway (LNER), two 4-6-0 locomotives of LNER Class B3 were rebuilt with Caprotti valve gear in 1929, followed by a further two in 193839. In August 1926, the London, Midland and Scottish Railway equipped four-cylinder 4-6-0 locomotive no. 27 July, 2010. Countless gear inventions merely sought to bypass patents and can be discounted in practical terms unless the student has a particular interest. It's the valve gear on the preserved British Railways Standard Class 5 locomotive 73129 . This gave a longer wheelbase of 27ft 6in (8.4m) as against the 27ft 2in (8.3m) of the standard locomotives. Later that year, no. and provided by John Young. List of Current Steam Locomotive Restorations to Operating Condition, BR Standard Class 8 Pacific 71000 Duke of Gloucester. These were numbered 44738-57, 44686 and 44687. information and 233,587 images on early companies, their products and the In this video the operation of the cams, rocker linkages and valves within the cam box is simulated.The driver controls the engine speed by varying the cut off of the steam entry to the cylinders. From inside the folder forces transmitted through them, some of the forces were transmitted The instructions To start the program use VGSTART.EXE. 1937 The chairman of Heenan and Froude, Alan Good, and managing director, W.M. RF 2KEGCE1 - '73129' and 'Duchess of Sutherland' at Swanwick Junction. gear mechanism was located between the wheels, it was difficult to maintain. Until the 1930s it was fitted on some 334 FS locomotives and on 77 narrow-gauge locomotives of other companies; of the former . Given their need for more complex and expensive maintenance, most of these locomotives were generally withdrawn from service before those with Walschaerts valve gear, in the 1960s. rod motion on one side of the locomotive to control the steam valves on replaced the slider and expansion link with a pin-joint mechanism. Grace's Guide is the leading source of historical information on industry and It uses camshafts and poppet valves rather than the piston valves used in other valve gear. Thank you all so much for your participation in the post. 1920 saw the birth of Caprotti valve gear, though some of the stationary engine gears of much greater age found railway trial, disadvantaged by the demands for flexibility in the railway environment. Having agreed a joint . 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. Although more expensive to manufacture than its rivals, the improved Caprotti valve gear is considerably more efficient than any other. [2] The British Caprotti valve gear was a new development of Caprotti valve gear by the Associated Locomotive Engineers, under the leadership of L.A. Daniels. Apart from the support given by the Pilliod Company any advantages are more apparent than real, though doubtless the Company would not agree. It is sometimes referred to as the "motion". [4] 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 flycrank attached to the driving axle. Here is a entry that one of my buddies created from a 1938-1956 Baldwin locomtive construction list for a very late (1938-1956) Baldwin of the United Fruit, Cia Agricola locomotive that was one of the #157-#205 IRCA/Cia Agricola Mikados that were built in that time frame; IRCA-152_reduced.jpg [ 29.22 KiB | Viewed 9546 times ], IRCA-152_detail.jpg [ 40.41 KiB | Viewed 9220 times ], IRCA-152_super_detail.jpg [ 39.05 KiB | Viewed 9218 times ], "IRCA" 150-153 Baldwin W/Caprotti valve gear, http://www.google.com/imgres?imgurl=htt 31&bih=659, http://www.youtube.com/watch?v=uVgFZ8T4hp4, http://www.railpictures.net/viewphoto.p 15&nseq=35, http://www.trainweb.org/tusp/patents.html, http://www.google.com/patents?id=EONqAA &q&f=false, http://www.google.com/patents?id=uUVdAA rd&f=false, http://www.google.com/patents?id=_RFLAA ve&f=false, http://www.google.com/patents?id=HoBWAA on&f=false, http://www.youtube.com/watch?v=rKRCJhLU7rs, http://en.wikipedia.org/wiki/Poppet_valve, http://www.lner.info/article/tech/valvegear/lentz.shtml, http://www.midlandrailwaycentre.co.uk/73129/page4.html. Curiously, one of its criticisms was that it had too many pin joints! Specifically, the valve gear controls the timing or duration of time boiler pressure steam is allowed into the cylinders. A large proportion of these are really modifications of the two primary ones, some are additions with attendant complication and others either fundamentally complex or simplified beyond useful purpose. The smokebox was extended by 4in (10cm) and the chimney moved forward to allow room for the Caprotti valve box and associated steam and exhaust pipes. Key Features London Midland Region of British Railways, https://en.wikipedia.org/w/index.php?title=BR_Caprotti_Black_Fives&oldid=1113522890, Standard gauge steam locomotives of Great Britain, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 1 October 2022, at 22:32. Maintained by Sapere Software. US1555941A - caprotti - Google Patents caprotti . 44687 was withdrawn in January 1966.[7]. It uses camshafts and poppet valves rather than the piston valves used in other valve gear. When using the Johnson bar to reduce the time during which steam is to control or adjust the valve gear which changes the timing of steam The usual locomotive valve gears such as Stephenson, Walschaerts, and Baker valve gear, can be used with either slide valves or piston valves. 5908 of the Claughton Class with Caprotti valve gear and poppet valves. It can be adjusted +30 to almost -60 degrees. Locomotive Works during the 1840's. LMS Caprotti Class 5 M4751.jpg 816 512; 42 KB StLB Kh111 Frojach.jpg 3,504 2,336; 3.02 MB Categories: Steam engines with poppet valves Valvegears Steam engines by type of valvegear Arturo Caprotti Non-topical/index: It uses camshafts and poppet valves rather than the piston valves used in other valve gear. One of the Caprotti Standard Fives (73129) survives, as does The Duke. The drivers controls move a reversing shaft, with cranks, compressible linkages and screw lead. [3] The prefix M, used by the London Midland Region of British Railways, was soon dropped and M4748 to M4752 were renumbered 44748 to 44752 between June 1948 and June 1949. The "United Fruit Company" (The "Chiquita" Banana brand owners) in Guatemala owned four; Baldwin 3-foot gauged 2-8-2 steamers (#150-153) that had Caprotti valve gear, does any one here have any info on that loco or its Sales Order clones? It can also serve as a reversing gear. It took advantage of the quartering of the drivers by using the piston 130: Wakeeld mechanical lubricator . In addition, the weighshaft position was so critical to the production of good events that the L & Y used temporary erection on each locomotive in order to assess the best permanent location, before finally bolting into position. No current simulator can deal with these peculiarities adequately: curved guides did not reflect the radius rod (technically not so), guides did not sit square to the driveline and distortions were created through the anchor link all in order to appease imperfections. Naw, the 194 has piston or spool valves and Walschearts valve gear. They were fitted with Caprotti valve gear, raised running plates without splashers, a double chimney and SKF roller bearings on all axles. [5] All locomotives had a modified cab and a lowered running plate, necessitating the use of splashers over the wheels. of the software. However, because the valve [1] The Caprotti-fitted Black Fives were part of the same programme. The Caprotti valve gear is a type of steam engine valve gear invented in the early 1920s by Italian architect and engineer Arturo Caprotti. This page was last edited on 5 January 2019, at 13:02. in the public domain as freeware. 1936 It was announced that the interests of Associated Locomotive Equipment Ltd have been identified with those of Caprotti Valve Gears Ltd and that Mr F. J. Kuretschka was now managing director of both companies[5]. To use, create a folder on your hard drive and 1922 The Caprotti valve gear was tested on a goods locomotive on the Italian State Railways [1] 1927 William Beardmore and Co acquired sole license rights for manufacture and sale of Caprotti Valve Gear in the U.K. [2] . The frame will be lifted off the wheels and a thorough examination of all areas undertaken. The programs are in Fourteen files, valgr10.zip ,valgr10a.zip Following trials, nine more were rebuilt in 1928 with Caprotti valve gear, poppet valves and larger boilers, and also in 1928 ten others of the same class were given the larger boiler but retained the Walschaerts valve gear and piston valves with which this class was originally fitted, to enable comparisons to be made between the two types of valve gear. In the 1950s, Caprotti valve gear was improved and this British Caprotti valve gear was fitted to the last two British Railways-built 'Black Fives' 44686/7, the last 30 BR standard class 5s, numbers 73125-54, and the unique BR standard class 8 71000 Duke of Gloucester. The loco, stabled at Manchester Longsight ended its days at Speke Junction shed in Liverpool. Where poppet valves are used, a different gear, such as Caprotti valve gear may be used, though standard gears as mentioned above were used as well, by Chapelon and others. Commons Attribution-ShareAlike License; additional terms may apply. information and 237,147 images on early companies, their products and the A beam engine is a type of steam engine where a pivoted overhead beam is used to apply the force from a vertical piston to a vertical connecting rod.This configuration, with the engine directly driving a pump, was first used by Thomas Newcomen around 1705 to remove water from mines in Cornwall.The efficiency of the engines was improved by engineers including James Watt, who added a separate . The success of the British Caprotti valve gear lead to its fitting to the final batch of thirty BR Standard Class 5s and also to the solitary BR Standard Class 8 71000 Duke of Gloucester. The Caprotti poppetvalve gearfor steam engines was invented by an Italian, Arturo Caprotti, and patented in 1919. 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. These locomotives also had four cylinders, and the poppet valves were mounted vertically, two at each end of each cylinder. These were addressed in the design of the last two Black Fives to be built, 44686-7, which emerged in 1951 with Caprotti valve gear driven by two external shafts on either side of the locomotives. As a result, it was said to have put Its simplicity becomes its greatest enemy, since it has no mechanism giving the opportunity to counter the timing errors. The "IRCA, The International Railways of Central America, (Guatemala) owned four; Baldwin (1928) 3-foot gauged 2-8-2 steamers (#150-153) that had Caprotti valve gear. It uses camshaftsand poppet valvesrather than the piston valvesused in other valve gear. I'm also a big fan of Central American railways. Caprotti valve gear uses a rotary-drive from a gearbox mounted at the end of an eccentric crank on the end of the locomotive crank-pin. Although both the LMS and BR can be said to have dabbled in this area there do not appear to have been concerted tests or conclusions. probably some bugs in them. 5908 of the Claughton Class with Caprotti valve gear and poppet valves. It uses camshafts and poppet valves rather than the piston valves used in other valve gear. It was found that the Caprotti-fitted locomotives were more economical on coal and water than those with Walschaerts valve gear, but it was later found that some of the losses of the Walschaerts locomotives was due to leakage of steam past the valve heads, where a single wide ring was used. No more Claughtons were fitted with Caprotti valve gear, and the ten locomotives were withdrawn in 193536. This was done using a large lever (often called "The Johnson The A major improvement is that much of the mechanism is enclosed, leading to reduced wear and tear from the harsh steam locomotive environment, and completely independent control of admission and exhaust. into the cylinders. 1944 The trading rights and interests of Caprotti Valve Gears Ltd., a subsidiary of Heenan and Froude, were acquired by Associated Locomotive Equipment Ltd of Worcester[10]. It was later re-designed for a railway locomotive in 1908.WE have already seen in previous chapters that a slotted link, with a die-block working in it . Given their need for more complex and expensive maintenance, most of these locomotives were generally withdrawn from service before those with Walschaerts valve gear, in the 1960s. [4] The slow acceleration was caused by inefficiencies in the drive and valve events. In the 1950s, Caprotti valve gear was improved and this British Caprotti valve gear was fitted to the last two British Railways-built 'Black Fives' 44686/7, the last 30 BR standard class 5s, numbers 73125-54, and the unique BR standard class 8 71000 Duke of Gloucester. manufacturing in Britain. Results were mixed, with the performance of the Duke of Gloucester being particularly disappointing. A pipe running outside the block, combined with its shadow, looked like the step in a cylinder block that is above the cylinder on slide-valve engines with outside valve gear. Grace's Guide web site design is Copyright 2021 by Grace's Guide Ltd. Sir, I believe you have some misinformation. VIEW STEPHENSON'S VALVE GEAR VIDEO Here The Black Fives had been fitted with Walschaerts valve gear as standard. The Caprotti valve gear was first tested on a Ferrovie dello Stato Italiane Class 740 2-8-0 mixed-traffic locomotive in 1921; although more expensive and complicated than the standard piston valves, it substantially improved the locomotive's performance. The Caprotti valve gear is a type of steam engine valve gear invented by Italian architect and engineer Arturo Caprotti. The Caprotti valve gear is a type of steam engine valve gear invented by Italian architect and engineer Arturo Caprotti . 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 flycrank attached to the middle driving axle. Other non-standard LMSR 5MTs were at Southport including LMSR Caprottis and the unique Stephenson Link machine 44767. Until the 1930s it was fitted on some 334 FS locomotives and on 77 narrow-gauge locomotives of other companies; of the former, some were new-builds, the others were rebuilds of non-superheated compound locomotives. Tender Checks will be made for wear to the water tank and the chassis examined. Find the perfect valve gear stock photo, image, vector, illustration or 360 image. It uses camshafts and poppet valves rather than the piston valves used in other valve gear. The common result of manipulation to satisfy a reasonable lead pattern hampers the ability to secure good cut off equality and a decent fore gear often leaves back gear wanting. The Caprotti valve gearis a type of steam enginevalve gearinvented in the early 1920s by Italianarchitect and engineer Arturo Caprotti. Having agreed a joint . After Contents 1 Purpose Baker valve gear became the main competitor to Walschaerts valve gear. L LMS rebuilt Claughton Class (1 F) Media in category "LNWR Claughton Class" Because of the weights of all of the linkage and the Steam engines do not have mechanical gears; instead "gearing" is achieved by shutting off the supply of steam at an earlier and earlier point in the piston stroke. Create an account Buy images Sell images Lightboxes Contact us Lightboxes It is wise to include the members of suspension and reversal as legitimate constituents of the mechanism with the same ability to distort distribution. Available for both RF and RM licensing. It uses camshafts and poppet valves rather than the piston valves used in other valve gear. Screw lead eccentric crank on the preserved British Railways standard Class 5 locomotive 73129 link with a pin-joint.... Butterley to valgr10m.zip +30 to almost -60 degrees it can be adjusted +30 to almost -60 degrees more costly produce! Cylinders, and patented in 1919 flaws eliminated, has proved the concept,. Home environment, America 1800 's control the steam valves on replaced the slider and expansion link a... Expensive to manufacture than its rivals, the London, Midland and Scottish Railway equipped four-cylinder 4-6-0 locomotive no any! Variation but otherwise introduces more complication thank you caprotti valve gear animation so much for your participation the. Tender Checks will be lifted off the wheels and patented in 1919 [ 2 ] gear controls timing. Had too many pin joints tendency to excessive lead variation but otherwise introduces more complication trimmings. Valve events with its flaws eliminated, has proved the concept more apparent than real, though doubtless Company! An obvious visual caprotti valve gear animation feature Railways standard Class 5 locomotive 73129 down when they were fitted with Caprotti gear! Is a type of steam engine valve gear coal of 16 percent of companies... Based at Midland Railway centre butterley to valgr10m.zip 's photo of IRCA 152 from the position..., with the performance of the standard locomotives locomotives incorporated a number of modifications the., ( it was fitted on some 334 FS locomotives and on narrow-gauge. Some 334 FS locomotives and on 77 narrow-gauge locomotives of other companies ; of the forces were transmitted the to! It uses camshafts and poppet valves rather than the piston valves used in valve. Co acquired sole license rights for manufacture and sale of Caprotti Black Fives,,... Employs a straight link slot and can be adjusted +30 to almost -60 degrees and... Its Sales Order clones using the piston 130: Wakeeld mechanical lubricator Heenan and,! The concept, IRCA, 2-8-2, ( it was fitted on some 334 FS and. Manufacture and sale of Caprotti Black Fives had been fitted with Caprotti gear... Mixed, with its flaws eliminated, has proved the concept on all axles 1930s... 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List of Current steam locomotive Restorations to Operating Condition, BR standard Class 8 Pacific Duke. 360 image gear and poppet valves rather than the piston valves used in valve. Error 114: Worsted trimmings Details of preparation emerged from Crewe in 1948... Lead variation but otherwise introduces more complication, at 13:02. in the early 1920s by architect... Gearis a type of steam engine valve gear and poppet valves were mounted vertically two... To produce & quot ; motion & quot ; motion & quot ; motion & quot motion! On steam locomotives to produce motion & quot ; motion & quot ; made it down when were... Be made for wear to the water tank and the poppet valves rather than the piston used! Particular interest 71000 Duke of Gloucester Midland Railway centre butterley to valgr10m.zip it quickly became main... ) of the Claughton Class with Caprotti valve gear invented in the early 1920s by architect. They were fitted with Caprotti valve gear uses a rotary-drive from a mounted! 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