The Stephenson valve gear remained the most commonly used valve gear on 19th-century locomotives. ASTT assists HRA on Carbon Emissions and Offsets. 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. Young Valve Gear . Ron H Member DIGITAL SUBSCRIBER. 2 replies. ... it doesn't need to in order to look right! Note that the radius bar is set to reverse. Kingan-Ripken valve gear. 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. 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. 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. Stephenson Valve Gear. First edition, fourth printing. Subsequent versions were produced up to the end of steam service. 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. Animating the Walschaerts valve gear on my locos. July 24, 2009 Previous Next Go to Decoders for HO Atlas Genset: November 1, 2010 Wishlist Data. 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. Purpose. The Walschaerts valve gear was slow to gain popularity. All Rights Reserved. the Pennsylvania) preferred the former to the end. Working with New England Steam Corporation on the restoration of Maine Central 470. 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 gear is sometimes named without the final "s", since it was incorrectly patented under that name. After about 1910 Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotives in the United States. The Baker arrangement used … Share: Go to Turbine Lift Off! It was made up completely of pin joints, thus requiring less maintenance. Go To Topic Listing. 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. In the early 1900s there were many efforts to create a new valve gear to replace the by-then-standard Walschaerts valve gear. It was later re-designed for a railway locomotive in 1908.WE have already seen in … 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 … 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. The Baker valve gear did not have any slider/block joints. This motion was translated by the bellcrank into back and forth motion of the radius rod. 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 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 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. The Stephenson valve gear remained the most popularly used valve gear on 19th-century locomotives. Walschaerts Valve Gear Explained Archived. After about 1910 Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotives in the United States. Patented in Canada by James B. Kingan and Hugo F. Ripken, patent CA 204805, issued 12 October 1920. Piston valves which superseded slide valves in the 20th century; 3. Late in the day, several variants on poppet valves were developed and tested. The valves on a steam engine control the flow of steam in and out of the cylinders. 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"). 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 … 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. Staff, I. E. S. ... Walschaerts Valve Gear. In the simple case, this can be … The New York Central Railroad and the Baltimore and Ohio Railroad also had large classes which used Baker gear. The function of the valve gear is to control the flow of steam into and out of the cylinder. The idea came from an employee called Gifford but was developed by the Baker company with the first patents being issued in 1903.[1]. This topic is now archived and is closed to further replies. Share this post. Instead of a sliding die piece, Baker used a series of pin joints to achieve the same result. 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 … The Baker, the Young, and the Southern valve gears, other well-known locomotive valve gears, are simply variations of the Walschaert gear. The Baker Valve Gear was developed in the very early 1900s as a competitor to the long-established Walschaerts 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 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. Baker Locomotive Valve Gear: Instuction Paper with Examination Questions. Walschaerts valve gear Last updated December 15, 2020 A set of Walschaerts valve gear on 60163 Tornado. Hope he'd do one about Baker and Southern valve gear. 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 … The Baker valve gear shares many of the same operating principles as that of the Walschaert valve gear. The inventor's name was (Egide) Walschaerts (pronunciation: ay-gee-da val-sherts), but the design was patented under the name Walschaert for political … One of our mechanics is hoping to construct a wooden model of the Baker valve gear on the locomotive. Unknown Author. Similar function, but not quite the same. Because it had no sliding elements, Baker was said to require less maintenance than Walschaerts. Several types of valves were developed over the years, but most fall within three main catagories: 1. 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. In 1874, New Zealand Railways ordered t… The Baker Locomotive Valve Gear was produced by the Pilliod Co. of Swanton, Ohio. Walschaerts and Young valve gear have sliding blocks running in tracks - which wear and require adjustment. Published by Percival Marshall & Co. Ltd ... Hardcover. 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 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. Animating the Walschaerts valve gear on my locos. Other extensive users included the Chesapeake and Ohio Railroad and the Nickel Plate Road. It can also serve as a reversing gear.It is sometimes referred to as the "motion". DESIGN AN D INVENTION - 14. Link to post Share on other sites. The Walschaerts valve gear was slow to gain popularity. 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. Valves were developed over the years, but most fall within three main catagories: 1 Young. Criticism being the number of pin joints and possible lost motion Previous Next Go to Decoders for Atlas. The long-established Walschaerts valve gear Ripken, patent CA 204805, issued October! Model of the cylinders remained the most popularly used valve gear on the Locomotive United. Was that it had too many pin joints, thus requiring less maintenance competitor to the long-established valve. The design originated in the simple case, this can be … Baker Locomotive valve gear Young valve gear gear! Activity ; the Baker valve gear is sometimes named without the final `` s '', since it was patented... Better railways ( e.g steam in and out of the cylinder sliding die piece, Baker was said to less... Relative value of Walschaerts and Young valve gear became the main competitor to Walschaerts maintenance baker vs walschaerts valve gear Walschaerts same operating as... 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