After about 1910 Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotives in the United States. 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. Further Methods of Distributing Steam to the Cylinders. Basically I have precision machined drill rod pins running in 660 bearing bronze bushings. In forward motion, the yoke was pushed forward, so that its upper pivot was in front of the bell crank-main link connection. The Baker Valve Gear was developed in the very early 1900s as a competitor to the long-established Walschaerts Valve Gear. I hope this helps answer the question about why the Southern changed from Baker to Walschaerts. It can also serve as a reversing gear.It is sometimes referred to as the "motion". Because it had no sliding elements, Baker was said to require less maintenance than Walschaerts. 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. Wardale’s response to arguments for using Caprotti Valves on the 5AT. Staff, I. E. S. ... Walschaerts Valve Gear. The function of the valve gear is to control the flow of steam into and out of the cylinder.  Obviously opinion was divided even in America on the relative value of Walschaerts and Baker as some of the better railways (e.g. The idea came from an employee called Gifford but was developed by the Baker company with the first patents being issued in 1903.[1]. Piston valves which superseded slide valves in the 20th century; 3. Jim Kreider posted on Facebook, August 2018: 1. 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. 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. After about 1910 Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotives in the United States. All Rights Reserved. Animating the Walschaerts valve gear on my locos. The Walschaerts valve gear was slow to gain popularity. The Baker, the Young, and the Southern valve gears, other well-known locomotive valve gears, are simply variations of the Walschaert gear. Hope he'd do one about Baker and Southern valve gear. 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… Since you shouldn't press bronze bushings into bronze cas… 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 … Moving the eccentric arm back and forth lowered and raised the top of the main link. Go To Topic Listing. 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. In 1874, New Zealand Railways ordered t… The general adoption of the Walschaert valve gear has been accompanied by a number of variations which, do not eliminate its esential elements. Instead of a sliding die piece, Baker used a series of pin joints to achieve the same result. Walschaerts and Young valve gear have sliding blocks running in tracks - which wear and require adjustment. 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. Western United States and British railroads tended to continue with the Walschaerts pattern, as did the Pennsylvania Railroad. 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. 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 … 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. Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotive s in the United States. Walschaerts Valve Gear Explained Archived. Baker valve gear became the main competitor to Walschaerts 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. 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. 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. Some older American locos used bolt-on Walschaerts' or 'Baker' gear to update … The Stephenson valve gear remained the most commonly used valve gear on 19th-century locomotives. 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. Why was Walschaerts Valve Gear chosen over Baker? Ron H Member DIGITAL SUBSCRIBER. ASTT assists HRA on Carbon Emissions and Offsets.  I suspect it is also heavier. It was extensively used in steam … The Baker valve gear did not have any slider/block joints. 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. There was always debate about the advantages of Baker gear, the main criticism being the number of pin joints and possible lost motion. It was made up completely of pin joints, thus requiring less maintenance. Share: Go to Turbine Lift Off! Link to post Share on other sites. I'm going to lower the radius rod in the … 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 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 … Would not British Caprotti Valve Gear be better suited to the 5AT than Walschaerts? 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"). In 1844 Egide Walschaerts invented a valve gear that by 1848 appeared very much as it does … 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). 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 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. 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. Purpose. 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. Working with New England Steam Corporation on the restoration of Maine Central 470. the Pennsylvania) preferred the former to the end. Poppet valves similar in principle to those used i… It was extensively used in steam … It was later re-designed for a railway locomotive in 1908.WE have already seen in … Share this post. Category: Tony's Tips, Locomotives & Miscellaneous. This topic is now archived and is closed to further replies. First edition, fourth printing. // The Baker Locomotive Valve Gear was produced by the Pilliod Co. of Swanton, Ohio. Walschaerts valve gear Last updated December 15, 2020 A set of Walschaerts valve gear on 60163 Tornado. One of our mechanics is hoping to construct a wooden model of the Baker valve gear on the locomotive. Subsequent versions were produced up to the end of steam service. In the simple case, this can be … Purpose. 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. 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. After about 1910 Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotives in the United States. The Walschaerts valve gear was slow to gain popularity. Several types of valves were developed over the years, but most fall within three main catagories: 1. Young Valve Gear . All Activity; 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 Stephenson valve gear remained the most popularly used valve gear on 19th-century locomotives. 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 … In the simple case, this can be … July 24, 2009 Previous Next Go to Decoders for HO Atlas Genset: November 1, 2010 Wishlist Data. This is for our understanding and instruction, as well as to teach others. Baker Valve Gear. 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. 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. 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. It was particularly popular on the Norfolk and Western Railway, and almost all later N&W engines used it (notably NW 611). 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. Unknown Author. 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! 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. Similar function, but not quite the same. Late in the day, several variants on poppet valves were developed and tested. After about 1910 Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotives in the United States. 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