Walschaerts Valve Gear Explained Archived. The design originated in the A.D. Baker Company, of Swanton, Ohio; a builder of steam traction engines. I hope this helps answer the question about why the Southern changed from Baker to Walschaerts. The Baker valve gear did not have any slider/block joints. The Baker arrangement used more pivot bearings or "pin joints", but avoided the die slip inherent to the expansion link, with the aim of lessening wear … In the simple case, this can be … In 1844 Egide Walschaerts invented a valve gear that by 1848 appeared very much as it does … The valve gear of a steam engine is the mechanism that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle. Walschaerts valve gear Last updated December 15, 2020 A set of Walschaerts valve gear on 60163 Tornado. Animating the Walschaerts valve gear on my locos. The first group of Ms 4s were delivered from Baldwin with Baker valve gear in 1926 but after that they were delivered from Alco and Baldwin with Walschaerts valve gear. The company’s efforts were devoted to supplying original and replacement parts for the Baker gear, which had been applied to 10,000 locomotives at that time. Animating the Walschaerts valve gear on my locos. The Baker valve gear had one operating advantage over the Walschaerts in that it could be set up for a larger valve w/longer valve travel, 8-1/2" vs. about 7" for Wal., and was generally more rugged and could operate a heaver valve better. Strictly speaking it was not a valve gear but a variable expansion mechanism adapted to the Walschaerts layout replacing the expansion link and sliding die block.  Obviously opinion was divided even in America on the relative value of Walschaerts and Baker as some of the better railways (e.g. Here's some photos of the pin and bushing sets that I made for the Baker Valve Gear and sold along with the gear if a builder wanted them. Category: Tony's Tips, Locomotives & Miscellaneous. Walschaerts and Young valve gear have sliding blocks running in tracks - which wear and require adjustment. Stephenson Valve Gear. Moving the eccentric arm back and forth lowered and raised the top of the main link. Working with New England Steam Corporation on the restoration of Maine Central 470. Similar function, but not quite the same. Baker valve gear became the main competitor to Walschaerts valve gear. Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotive s in the United States. Unknown Author. The big advantage of Baker valve gear is that all moving parts were rotary, and were fitted with roller bearings. The Walschaerts valve gear is a type of valve gear invented by Belgian railway mechanical engineer Egide Walschaerts in 1844 used to regulate the flow of steam to the pistons in steam engines. This is a Walschaerts-type gear in which the combination lever is linked to an arm on the connecting rod, near its small end, instead of to the crosshead. Baker Locomotive Valve Gear: Instuction Paper with Examination Questions. 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 framesclear and allowing easy access for service and adjustment; which resulted in it being ado… This topic is now archived and is closed to further replies. Southern Valve Gear. Hope he'd do one about Baker and Southern valve gear. Why was Walschaerts Valve Gear chosen over Baker? Western United States and British railroads tended to continue with the Walschaerts pattern, as did the Pennsylvania Railroad. The remainder of the gear is the same, so that the return crank and combination lever take the same form, although the proportions are usually modified. Jim Kreider posted on Facebook, August 2018: 1. By the way, Walschaert gear is correct; Walschaerts gear is not (unless it is used in the possessive case, with an apostrophe, eg: "Walschaerts' design"). ASTT assists HRA on Carbon Emissions and Offsets.  I suspect it is also heavier. After about 1910 Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotives in the United States. Wardale’s response to arguments for using Caprotti Valves on the 5AT. The Baker valve gear replaces the expansion link of the Walschaerts gear with an assembly of levers and links which produces the same effect of allowing continuous variation valve travel. Patented in Canada by James B. Kingan and Hugo F. Ripken, patent CA 204805, issued 12 October 1920. In the simple case, this can be … Several types of valves were developed over the years, but most fall within three main catagories: 1. Further Methods of Distributing Steam to the Cylinders. In the United States the Young, Southern, Caprotti and Franklin patterns were used on a few classes, but only the Baker pattern won more than limited acceptance. Slide valves largely used in the 19th century; 2. In forward motion, the yoke was pushed forward, so that its upper pivot was in front of the bell crank-main link connection. The Pilliod Co. sold the gear as a single assembly which was mounted on the frame in the location ordinarily occupied by the Walschaerts expansion link. Note that the radius bar is set to reverse. The Stephenson valve gear remained the most popularly used valve gear on 19th-century locomotives. After about 1910 Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotives in the United States. The inventor's name was (Egide) Walschaerts (pronunciation: ay-gee-da val-sherts), but the design was patented under the name Walschaert for political … The New York Central Railroad and the Baltimore and Ohio Railroad also had large classes which used Baker gear. Purpose. The function of the valve gear is to control the flow of steam into and out of the cylinder. Share: Go to Turbine Lift Off! The Walschaerts valve gear was slow to gain popularity. It was made up completely of pin joints, thus requiring less maintenance. It was extensively used in steam … ... it doesn't need to in order to look right! Most locos built since the 1920s use piston valves as per the diagram; some earlier locos with lower superheat & pressure used slide valves - look at the animation 'wals_out' notice the radius rod links with the combination lever below the valve axis. It was extensively used in steam … There was always debate about the advantages of Baker gear, the main criticism being the number of pin joints and possible lost motion. All Activity; Subsequent versions were produced up to the end of steam service. One of our mechanics is hoping to construct a wooden model of the Baker valve gear on the locomotive. The Walschaerts valve gear was slow to gain popularity. Staff, I. E. S. ... Walschaerts Valve Gear. The general adoption of the Walschaert valve gear has been accompanied by a number of variations which, do not eliminate its esential elements. After about 1910 Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotives in the United States. Published by Percival Marshall & Co. Ltd ... Hardcover. Strictly speaking it was not a valve gear but a variable expansion mechanism adapted to the Walschaerts layout replacing the expansion link and sliding die block. 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. At this point, the back and forth motion of the lower end of the main link left the top relatively motionless as main link swung back and forth on the swing links. Some older American locos used bolt-on Walschaerts' or 'Baker' gear to update … the Pennsylvania) preferred the former to the end.  The only advantage of Baker that I know of is elimination of the sliding link/dieblock, and as you rightly surmise that problem is dealt with by mechanical lubrication as on the SAR 25 Class.”, Copyright © AST Group 2021. The Baker, the Young, and the Southern valve gears, other well-known locomotive valve gears, are simply variations of the Walschaert gear. The Baker arrangement used … // July 24, 2009 Previous Next Go to Decoders for HO Atlas Genset: November 1, 2010 Wishlist Data. 2 replies. The valve gear of a steam engine is the mechanism that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle. Ron H Member DIGITAL SUBSCRIBER. In 1874, New Zealand Railways ordered t… The Baker valve gear shares many of the same operating principles as that of the Walschaert valve gear. Curiously, one of its criticisms was that it had too many pin joints! In Britain Baker gear was popular amongst model engineers but in full-size practice the length of the yoke and the width of the assembly may have been difficult to accommodate within the restricted loading gauge. The Walschaerts valve gear is a type of valve gear invented by Belgian railway mechanical engineer Egide Walschaerts in 1844 used to regulate the flow of steam to the pistons in steam engines.The gear is sometimes named without the final "s", since it was incorrectly patented under that name. The valves on a steam engine control the flow of steam in and out of the cylinders. DESIGN AN D INVENTION - 14. This is for our understanding and instruction, as well as to teach others. The Walschaerts valve gear is a type of valve gear invented by Belgian railway mechanical engineer Egide Walschaerts in 1844 used to regulate the flow of steam to the pistons in steam engines.The gear … Kingan-Ripken valve gear. It can also serve as a reversing gear.It is sometimes referred to as the "motion". Late in the day, several variants on poppet valves were developed and tested. Instead of a sliding die piece, Baker used a series of pin joints to achieve the same result. The gear is sometimes named without the final "s", since it was incorrectly patented under that name. Share this post. First edition, fourth printing. After about 1910 Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotives in the United States. Walschaerts Valve Gear. Because it had no sliding elements, Baker was said to require less maintenance than Walschaerts. Link to post Share on other sites. Young Valve Gear . Although a brief glance into history (except on the Continent) might place Stephenson’s gear as being largely replaced by Walschaerts’ gear around the turn of the 20 th century, both gears were invented almost simultaneously. The remainder of the gear is the same, so that the return crank and combination lever take the same form, although the proportions are usually … Strictly speaking it was not a valve gearbut a variable expansion mechanism adapted to the Walschaerts layout replacing the expansion link and sliding die block. In the early 1900s there were many efforts to create a new valve gear to replace the by-then-standard Walschaerts valve gear. Strictly speaking it was not a valve gear but a variable expansion mechanism adapted to the Walschaerts layout replacing the expansion link and sliding die block. The following comes from a “Is it just a Phantom” – David Wardale’s response to Herr Ebel published in Lok Report in March 2001: “It should be noted that needle roller bearings were an integral part of the American Baker valve gear, and are extensively used on Walschaerts valve gear on Chinese locomotives, operating successfully in a rather harsh environment.”, David has also offered the following response to the same question: “Baker valve gear is primarily rejected because it has too many pin joints (more than Walschaerts, check for yourself). It was particularly popular on the Norfolk and Western Railway, and almost all later N&W engines used it (notably NW 611). It was later re-designed for a railway locomotive in 1908.WE have already seen in … Purpose. The copy below is taken from page 88, Walschaert Valve Gear, of Locomotive Boilers and Engines, A Practical Treatise on Locomotive Boiler and Engine Design, Construction, and Operation, by Llewellyn V. Ludy, M.E., Professor of Experimental Engineering, Purdue University, American Society Of Mechanical … This page presents images from a Spare Parts Catalog for the Baker Locomotive Valve Gear, issued by The Pilliod Company of Swanton, Ohio, probably around 1925-26. The Baker Locomotive Valve Gear was produced by the Pilliod Co. of Swanton, Ohio. Go To Topic Listing. Would not British Caprotti Valve Gear be better suited to the 5AT than Walschaerts? The Baker arrangement used more pivot bearings or pin joints, but avoided the die slip inherent to the expansion link, with th… The following comes from a “Is it just a Phantom” – David Wardale’s response to Herr Ebel published in Lok Report in March 2001: “It should be noted that needle roller bearings were an integral part of the American Baker valve gear, and are extensively used on Walschaerts valve gear on Chinese locomotives, operating successfully … Poppet valves similar in principle to those used i… Basically I have precision machined drill rod pins running in 660 bearing bronze bushings. Since you shouldn't press bronze bushings into bronze cas… The idea came from an employee called Gifford but was developed by the Baker company with the first patents being issued in 1903.[1]. Strictly speaking it was not a valve gear but a variable expansion mechanism adapted to the Walschaerts layout replacing the expansion link and sliding die block. Piston valves which superseded slide valves in the 20th century; 3. On all my steam locos the radius rod is in a neutral position and does not move the valve stem in and out in the steam chest. I'm going to lower the radius rod in the … Other locomotives to use Baker valve gear were the New Zealand Railways J class, Ja class, Jb class, some Ka class, and the South Australian Railways 620 class. This motion was translated by the bellcrank into back and forth motion of the radius rod. The Stephenson valve gear remained the most commonly used valve gear on 19th-century locomotives. The Baker mechanism consisted of the following parts: The parts were arranged so that when the yoke was centered, the connection of the main link to the bellcrank was in a line with the two pivots on the yoke. The Baker valve gear replaces the expansion link of the Walschaerts gear with an assembly of levers and links which produces the same effect of allowing continuous variation valve travel. All Rights Reserved. It's hardly intuitive. The Baker Valve Gear was developed in the very early 1900s as a competitor to the long-established Walschaerts Valve Gear. Other extensive users included the Chesapeake and Ohio Railroad and the Nickel Plate Road. The angle of the yoke controlled the relative motion, and therefore the cutoff; tilting the yoke backwards reversed the motion of the radius rod. The Baker arrangement used more pivot bearings or pin joints, but avoided the die slip inherent to the expansion link, with the aim of lessening wear and the need for service; it could also facilitate longer valve travel. The Walschaerts gear had the advantage that it could be mounted entirely on the outside of the locomotives, leaving the space between the frames clear; this caused adoption first among some articulated locomotives. The same eccentric crank, eccentric crank pin and eccentric rod mechanism, as used on the Walschaert valve gear, is also used to drive the forward and backward swing of the gear connecting rod of the Baker valve gear. Baker Valve Gear. Spare parts brochure from the Pilliod Co. https://en.wikipedia.org/w/index.php?title=Baker_valve_gear&oldid=700324702, Creative Commons Attribution-ShareAlike License, This page was last edited on 17 January 2016, at 20:53. The Baker valve gear had one operating advantage over the Walschaerts in that it could be set up for a larger valve with longer valve travel, 8-1/2" versus about 7" for Walschaerts, and was generally more rugged and could operate a heavier valve … It can also serve as a reversing gear.It is sometimes referred to as the "motion". To replace the by-then-standard Walschaerts valve gear was the main competitor to the 5AT this was. I. E. S.... 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