baker vs walschaerts valve gear

Slide valves largely used in the 19th century; 2. The Baker, the Young, and the Southern valve gears, other well-known locomotive valve gears, are simply variations of the Walschaert gear. 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. It was extensively used in steam … The inventor's name was (Egide) Walschaerts (pronunciation: ay-gee-da val-sherts), but the design was patented under the name Walschaert for political … Would not British Caprotti Valve Gear be better suited to the 5AT than Walschaerts? Western United States and British railroads tended to continue with the Walschaerts pattern, as did the Pennsylvania Railroad. Because it had no sliding elements, Baker was said to require less maintenance than Walschaerts. 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. Further Methods of Distributing Steam to the Cylinders. ASTT assists HRA on Carbon Emissions and Offsets. 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 general adoption of the Walschaert valve gear has been accompanied by a number of variations which, do not eliminate its esential elements. All Activity; 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.  Obviously opinion was divided even in America on the relative value of Walschaerts and Baker as some of the better railways (e.g. Purpose. The Baker Valve Gear was developed in the very early 1900s as a competitor to the long-established Walschaerts Valve Gear. Similar function, but not quite the same. 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. 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. Kingan-Ripken valve gear. DESIGN AN D INVENTION - 14. In forward motion, the yoke was pushed forward, so that its upper pivot was in front of the bell crank-main link connection. 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. Ron H Member DIGITAL SUBSCRIBER. First edition, fourth printing. 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. Purpose. Baker valve gear became the main competitor to Walschaerts valve gear. The design originated in the A.D. Baker Company, of Swanton, Ohio; a builder of steam traction engines. 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. Baker Locomotive Valve Gear: Instuction Paper with Examination Questions. 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 … The Baker valve gear did not have any slider/block joints. Since you shouldn't press bronze bushings into bronze cas… This is for our understanding and instruction, as well as to teach others. Southern Valve Gear. ... it doesn't need to in order to look right! 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 function of the valve gear is to control the flow of steam into and out of the cylinder. After about 1910 Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotives in the United States. Category: Tony's Tips, Locomotives & Miscellaneous. Animating the Walschaerts valve gear on my locos. 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. Unknown Author. Why was Walschaerts Valve Gear chosen over Baker? 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. I hope this helps answer the question about why the Southern changed from Baker to Walschaerts. 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 … 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. Share this post. This motion was translated by the bellcrank into back and forth motion of the radius rod. The Baker Locomotive Valve Gear was produced by the Pilliod Co. of Swanton, Ohio. 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"). 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. Young Valve Gear . Wardale’s response to arguments for using Caprotti Valves on the 5AT. The Walschaerts valve gear was slow to gain popularity. 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. Go To Topic Listing. Piston valves which superseded slide valves in the 20th century; 3. Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotive s in the United States. There was always debate about the advantages of Baker gear, the main criticism being the number of pin joints and possible lost motion. 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. Jim Kreider posted on Facebook, August 2018: 1. 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. 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. Share: Go to Turbine Lift Off! The idea came from an employee called Gifford but was developed by the Baker company with the first patents being issued in 1903.[1]. The angle of the yoke controlled the relative motion, and therefore the cutoff; tilting the yoke backwards reversed the motion of the radius rod. Hope he'd do one about Baker and Southern valve gear. 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. 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. Basically I have precision machined drill rod pins running in 660 bearing bronze bushings. Staff, I. E. S. ... Walschaerts Valve Gear. Some older American locos used bolt-on Walschaerts' or 'Baker' gear to update … Published by Percival Marshall & Co. Ltd ... Hardcover. Poppet valves similar in principle to those used i… 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. Note that the radius bar is set to reverse. In 1874, New Zealand Railways ordered t… July 24, 2009 Previous Next Go to Decoders for HO Atlas Genset: November 1, 2010 Wishlist Data. One of our mechanics is hoping to construct a wooden model of the Baker valve gear on the locomotive. It was made up completely of pin joints, thus requiring less maintenance. After about 1910 Baker valve gear was the main competitor to Walschaerts valve gear for steam locomotives in the United States. Stephenson 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. 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. // 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. Instead of a sliding die piece, Baker used a series of pin joints to achieve the same result. It can also serve as a reversing gear.It is sometimes referred to as the "motion". The Baker valve gear shares many of the same operating principles as that of the Walschaert valve gear. 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. This topic is now archived and is closed to further replies. In the simple case, this can be … In the early 1900s there were many efforts to create a new valve gear to replace the by-then-standard Walschaerts valve gear. Patented in Canada by James B. Kingan and Hugo F. Ripken, patent CA 204805, issued 12 October 1920. It can also serve as a reversing gear.It is sometimes referred to as the "motion". 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. I'm going to lower the radius rod in the … 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. Walschaerts valve gear Last updated December 15, 2020 A set of Walschaerts valve gear on 60163 Tornado. 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 … Several types of valves were developed over the years, but most fall within three main catagories: 1. The gear is sometimes named without the final "s", since it was incorrectly patented under that name. the Pennsylvania) preferred the former to the end. 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. It's hardly intuitive.  I suspect it is also heavier. 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 most commonly used valve gear and require adjustment â Obviously opinion was even... Question about why the Southern changed from Baker to Walschaerts answer the question about why the Southern from... On the relative value of Walschaerts and Baker as some of the cylinders gear replace... Pivot was in front of the cylinders pin joints and possible lost motion gear, the main competitor to valve! Used Baker gear, the yoke was pushed forward, so that its upper pivot was in of. The Locomotive of the Baker valve gear was developed in the simple case, can., August 2018: 1 catagories: 1 Pilliod Co. of Swanton, Ohio the valves on the value. The main competitor to the end most fall within three main catagories: 1 Walschaerts valve gear was developed the. 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