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Walschaerts valve gear

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The eccentric rod provides motion to the expansion link (7) which is pivoted in a central location back to the body of the locomotive. The expansion link holds the radius bar (8), captive by a die block which is integral with the radius bar but is free to move vertically in a constrained curved path
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Contrast this to when the die block is at the bottom of the expansion link (7), giving maximum steam injection and exhaust. This is the most powerful forward setting and is used in accelerating forward from rest. Conversely when the die block is at the top of the expansion link (7), maximal power in
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The Walschaerts gear can be linked to inside or outside admission valves. This article has only considered inside-admission piston valves until now, but outside-admission valves (slide valves and some piston valves) can use Walschaerts valve gear. If the valves have outside admission the radius bar
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When greater power is necessary, e.g. when gaining speed when pulling out of a station and when ascending a gradient, the Walschaerts valve gear enables the engine driver to set the cutoff point near the end of the stroke, so that the full pressure of the boiler is exerted on the piston for almost
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To lay out Walschaerts gear, the proportions of the combination lever must be chosen. A displacement of the union link end by half the piston travel must cause a valve rod displacement of the valve lead plus the valve lap. The ratio of distance from union link end to pivot with radius rod to the
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This sudden pulse of pressure causes the loud puffing sound that members of the public associate with steam engines, because they mostly encounter engines at stations, where efficiency is sacrificed as trains pull away. A steam engine well adjusted for efficiency makes a soft hissing sound that
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In an economical setting, steam is admitted to the expanding space for only part of the stroke; at a point set by the driver, the intake is cut off. Since the exhaust is also shut, during the rest of the stroke the steam that has entered the cylinder expands in isolation, and so its pressure
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The Walschaerts valve gear is an improvement on the earlier Stephenson valve gear in that it enables the driver to operate the steam engine in a continuous range of settings from maximum economy to maximum power. At any setting, the valve gear satisfies the following two conditions:
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The valve gear operation combines two motions; one is the primary lead motion which is imparted at the bottom of the combination lever (12). The secondary is the directional/amplitude motion which is imparted at the top. Consider that the driver has adjusted the
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the entire stroke. With such a setting, when the exhaust opens, the steam in the cylinder is near full boiler pressure. The pressure in the steam at that moment serves no useful purpose; it drives a sudden pulse of pressure into the atmosphere and is wasted .
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Once the locomotive has accelerated the driver can adjust the reverser toward the mid-gear position, decreasing cut-off to give a more economical use of steam. The engine's tractive effort is then less than it was at starting, but its power is greater.
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See The Encyclopedia of Railroads, O. S. Nock, 1977 The name is Walschaert, changed by the family in 1830 when Belgium became independent of the Netherlands. It was patented under the name Walschaert because that is how the name was spelled in
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The eccentric crank (UK: return crank) (1) is rigidly attached to the con-rod pin connected to the main drive wheel. Note that this is the only suitable attachment point on any of the drive wheels that is not fouled by the passage of the
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The vertical position of the radius bar is controlled in the cab by the driver adjusting the reverser which in turn controls the mechanical linkage; reach rod (3), lifting link (4), lifting arm (5) and reverse arm and shaft (6).
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remained the most commonly used valve gear on 19th-century locomotives. 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
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When the piston is at either dead centre movement of the radius rod should not move the valve rod. Therefore the expansion link die slot should be an arc of a circle of radius equal to the length of the radius rod.
191:, who invented the mechanism independently in 1849. Heusinger's gear was closer to the form generally adopted, but most authorities accept Walschaerts' invention as sufficiently close to the final form. 226:. For economy, a steam engine is used of a size such that the most economical settings yield the right amount of power most of the time, such as when a train is running at steady speed on level track. 362:
The combination lever combines these two motions with the resultant acting upon the valve stem (13), suitably restrained by the valve stem guide (10), which in turn acts upon the piston valve (14).
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such that the die block is at mid-gear. In this position the secondary motion is eliminated and the piston valve travel is shortest, giving minimal injection and exhaust of steam. The travel of the
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The primary lead motion is provided by the crosshead arm (9) and the union link (11). This pivoting bar gives the in phase component of motion to the bottom of the combination lever (12).
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reverse is obtained. (On some engines the die block was in the top of the link in forward gear. This type was generally used on tank engines, which worked in forward and reverse equally.)
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Soon before the space on one side of the piston starts to contract, the valve starts to release steam from that space to the atmosphere, so as not to impede the movement of the piston.
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The first locomotive fitted with the Walschaerts valve gear was built at the Belgian Tubize workshops, and was awarded a gold medal at the 1873 Universal Exhibition in
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In this way the secondary, out of phase, driver controlled component of motion is imparted to the top of the combination lever (12) by the radius bar (8).
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distance between the valve rod end to the pivot with the radius rod should be in the same proportion as half piston travel to valve lap plus lead.
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The valve opens to admit steam to the cylinder just before the start of a piston stroke. The pressure of this steam provides the driving force.
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The Walschaerts valve gear enables the engine driver to change the cutoff point without changing the points at which intake starts.
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lasts throughout the exhaust stroke, with the sounds from the two cylinders overlapping to produce a nearly constant sound.
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Economy also requires that the throttle be wide open and that the boiler pressure is at the maximum safe level to maximise
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under that name. It was extensively used in steam locomotives from the late 19th century until the end of the steam era.
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In the 20th century, the Walschaerts valve gear was the most commonly used type, especially on larger locomotives. In
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The secondary directional/amplitude motion is derived from a mechanical linkage made up of several components.
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and some neighbouring countries, like Poland and Czechoslovakia, the Walschaerts gear is generally named the
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clear and allowing easy access for service and adjustment, which resulted in it being adopted in some
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0-4-4T of 1878. This was the first British locomotive to be fitted with Walschaerts valve gear
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The throw of the return crank must give the required oscillation of the expansion link.
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in 1844. The gear is sometimes named without the final "s", since it was incorrectly
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decreases. Thus, the most energy available from the steam (in the absence of a
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connects to the combination lever below the valve stem rather than above.
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There have been many variants of Walschaerts valve gear, including:
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Locomotive and Train working in the latter part of the 19th Century
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The Walschaerts valve gear was slow to gain popularity. The
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Online program for designing valve gears semi-automatically
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0-4-4T, exhibited in Paris in 1878 and purchased by the
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used to regulate the flow of steam to the pistons in
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Video: simple explanation of Walschaerts valve gear
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List of locomotives that use Walschaerts valve gear
2207: 486:. Chicago: The World Railway Publishing Company. 579:Sands, T.B. & Jenkins, Stanley C. (1990) . 611:. Vol. 4. Cambridge: Heffer. p. 122. 581:The Midland and South Western Junction Railway 283:The key components of Walschaerts Valve Gear: 1259: 766: 668: 578: 501: 537: 42:Note that the radius bar is set to reverse. 1266: 1252: 773: 759: 680:(Revised ed.). Watford: Argus Books. 597: 521:. London: Sydney White: 620–621, 630. 1902 153:The first application in Britain was on a 652:Locomotive Valve Gears and Valve Setting 381: 278: 241: 159:Swindon, Marlborough and Andover Railway 86:Swindon, Marlborough and Andover Railway 80: 29: 2141:Glossary of steam locomotive components 478: 14: 2208: 603: 550:"History of Walschaerts' Valve Motion" 1247: 780: 754: 726:Charles Dockstader's Valve Gear Demos 746:Danbury Railway Museum - Danbury, CT 702:The Walscheart Locomotive Valve Gear 698: 560:: Baldwin & Rayward. p. 212 274: 543: 369:Inside and outside admission valves 287:Eccentric crank (UK: return crank) 34:A set of Walschaerts valve gear on 24: 1993:National Museum of Scotland engine 25: 2227: 1273: 717: 2175:List of steam technology patents 386:The Walschaerts valve gear on a 1054:Schwartzkopff-Eckhardt II bogie 662: 2160:Murdoch's model steam carriage 2146:History of steam road vehicles 644: 615: 572: 471: 13: 1: 2087:Murray's Hypocycloidal Engine 494: 454:Steam locomotive nomenclature 1810:Return connecting rod engine 510:"The Walschaerts Valve Gear" 311:Crosshead arm (UK Drop link) 189:Edmund Heusinger von Waldegg 161:in March 1882. According to 7: 1734:Condensing steam locomotive 442: 407: 10: 2232: 2041:"Coalbrookdale Locomotive" 352:along the expansion link. 194: 76: 2133: 2104: 2077: 2058: 2047:"Pen-y-Darren" locomotive 2012: 1965: 1918: 1909: 1876: 1857: 1848: 1767: 1724: 1716:Single- and double-acting 1696: 1666: 1618: 1590: 1544: 1535: 1451: 1379: 1326: 1317: 1281: 1211: 1167: 1062: 989:AAR type A switcher truck 978: 884: 851: 789: 740:BR Standard Class 5 73096 623:"Danbury Railway Museum, 484:The Walschaert Valve Gear 432:J. T. Marshall valve gear 377: 237: 131:locomotives, supplied by 1886:Newcomen Memorial Engine 464: 449:Johnson Bar (locomotive) 427:Bagnall–Price valve gear 2190:Timeline of steam power 2185:Stationary steam engine 2068:Woolf's compound engine 1975:Soho Manufactory engine 1830:Steeple compound engine 1497:straight line mechanism 246:Walschaerts In movement 127:locomotives. They were 107:articulated locomotives 2195:Water-returning engine 2169:Lean's Engine Reporter 1942:Chacewater Mine engine 1815:Six-column beam engine 1029:Krauss-Helmholtz bogie 678:Walschaerts Valve Gear 393: 330: 259:is twice the total of 247: 93: 48:Walschaerts valve gear 43: 2216:Locomotive valve gear 2035:London Steam Carriage 1044:Radial steering truck 861:AAR wheel arrangement 730:ValveGear Constructor 388:Pennsylvania Railroad 385: 282: 245: 98:Stephenson valve gear 84: 33: 1981:Bradley Works engine 1805:Reciprocating engine 1628:Babcock & Wilcox 1471:Centrifugal governor 871:Swiss classification 699:Wood, W. W. (1906). 480:Kirkman, Marshall M. 185:Heusinger valve gear 176:, by a wide margin. 121:New Zealand Railways 1522:Sun and planet gear 2022:Richard Trevithick 1620:Water-tube boilers 1434:Gresley conjugated 1119:Klien-Lindner axle 866:UIC classification 843:Dual Control Stand 742:as the visual aid) 422:Baguley valve gear 394: 331: 248: 224:thermal efficiency 94: 44: 27:Type of valve gear 2203: 2202: 2129: 2128: 2008: 2007: 1692: 1691: 1592:Fire-tube boilers 1447: 1446: 1241: 1240: 1144:Road–rail vehicle 1129:Luttermöller axle 999:Articulated bogie 853:Wheel arrangement 625:the reversing bar 544:Fry, Lawford H. ( 320:Combination lever 275:Technical details 67:Egide Walschaerts 56:steam locomotives 16:(Redirected from 2223: 2153:fardier Ă  vapeur 1987:Whitbread Engine 1948:Smethwick Engine 1916: 1915: 1855: 1854: 1674:Feedwater heater 1542: 1541: 1324: 1323: 1268: 1261: 1254: 1245: 1244: 1014:Cleminson system 775: 768: 761: 752: 751: 724:Valve Gear Demos 713: 710:Internet Archive 707: 691: 656: 655: 648: 642: 641: 639: 638: 629:. 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Retrieved 631:the original 624: 617: 608: 599: 580: 574: 562:. Retrieved 553: 545: 539: 529:– via 523:. Retrieved 518: 515:The Engineer 514: 503: 483: 473: 411: 403: 399: 395: 372: 364: 361: 358: 354: 350: 342:coupling rod 338: 335: 332: 326:Piston valve 296:Lifting link 269: 265: 257:piston valve 249: 232: 228: 221: 218: 210: 198: 184: 178: 167: 152: 141: 123:ordered two 118: 111: 95: 47: 45: 37: 1911:Watt engine 1711:Oscillating 1667:Boiler feed 1512:Plate chain 1491:Tusi couple 1404:Walschaerts 1289:Atmospheric 1154:Train wheel 1134:Radial axle 1114:Journal box 1034:Mason Bogie 970:Walschaerts 808:Cab forward 302:Reverse arm 299:Lifting arm 263:plus lead. 216:) is used. 144:Mason Bogie 125:NZR B class 18:Walschaerts 2120:Ljungström 2106:High-speed 1999:Lap Engine 1955:Resolution 1859:Precursors 1744:Kirchweger 1706:Locomotive 1653:Three-drum 1633:Field-tube 1600:Locomotive 1582:Lancashire 1502:Link chain 1486:Crankshaft 1453:Mechanisms 1381:Valve gear 1074:Adams axle 1039:Pony truck 1009:Blomberg B 965:Stephenson 950:Kuhn slide 886:Valve gear 818:Steeplecab 796:Short hood 782:Locomotive 687:0853441081 637:2007-07-20 564:1 November 558:Wellington 548:) (1906). 531:HathiTrust 525:1 November 495:References 437:Kuhn slide 323:Valve stem 317:Union link 308:Radius bar 137:Cape gauge 52:valve gear 2151:Cugnot's 2094:Salamanca 1795:Hydrolock 1780:Crosshead 1726:Condenser 1562:Egg-ended 1223:Blastpipe 940:Hackworth 833:Cowl unit 828:Hood unit 813:Sharknose 800:Long hood 676:(1980) . 293:Reach rod 214:condenser 119:In 1874, 2210:Category 2134:See also 2060:Compound 1935:Old Bess 1775:Blowback 1698:Cylinder 1684:Injector 1643:Stirling 1638:Sentinel 1552:Haystack 1466:Cataract 1439:Southern 1429:Caprotti 1304:Compound 1228:Smokebox 1216:elements 1193:LemaĂ®tre 1159:Wheelset 1067:elements 960:Southern 920:Caprotti 823:Cab unit 607:(1953). 554:Progress 482:(1909). 443:See also 408:Variants 133:Avonside 71:patented 64:engineer 62:railway 1850:History 1759:Surface 1577:Cornish 1537:Boilers 1419:Corliss 1356:Corliss 1339:D slide 1309:Uniflow 1299:Cornish 1233:Chimney 1212:Common 1203:Lemprex 1183:Kylchap 1079:Axlebox 935:Gresley 915:Bulleid 910:Baguley 593:. OL16. 344:or the 195:Purpose 181:Germany 90:Fairlie 88:Single 77:History 60:Belgian 38:Tornado 2162:(1784) 2156:(1769) 2122:(1908) 2116:(1862) 2097:(1812) 2089:(1805) 2079:Murray 2070:(1803) 2049:(1804) 2043:(1803) 2037:(1803) 2031:(1801) 2001:(1788) 1995:(1786) 1989:(1785) 1983:(1783) 1977:(1782) 1958:(1781) 1950:(1779) 1944:(1778) 1938:(1777) 1930:(1768) 1902:(1795) 1896:(1760) 1888:(1725) 1869:(1698) 1835:Stroke 1800:Piston 1785:Cutoff 1658:Yarrow 1610:Launch 1605:Scotch 1366:Sleeve 1361:Poppet 1346:Piston 1327:Valves 1319:Valves 1198:Lempor 1188:Kylpor 1063:Other 838:Boxcab 784:design 738:(with 684:  672:& 587:  546:trans. 378:Layout 238:Motion 187:after 170:Europe 114:Vienna 103:frames 36:60163 1768:Other 1572:Flued 1557:Wagon 1481:Crank 1424:Lentz 1414:Baker 1409:Allan 1334:Slide 1178:Giesl 1171:types 982:types 980:Bogie 955:Lentz 930:Gooch 900:Baker 895:Allan 888:types 706:(PDF) 695:1844. 465:Notes 1920:Beam 1461:Beam 1371:Bash 1351:Drop 1294:Watt 682:ISBN 585:ISBN 566:2022 527:2022 142:The 46:The 1739:Jet 1567:Box 1399:Joy 1389:Gab 945:Joy 925:Gab 791:Cab 519:102 391:E6s 261:lap 179:In 139:. 2212:: 798:/ 556:. 552:. 517:. 513:. 150:. 116:. 109:. 1267:e 1260:t 1253:v 774:e 767:t 760:v 712:. 690:. 640:. 627:" 568:. 533:. 40:. 20:)

Index

Walschaerts

60163 Tornado.
valve gear
steam locomotives
Belgian
engineer
Egide Walschaerts
patented

Swindon, Marlborough and Andover Railway
Fairlie
Stephenson valve gear
frames
articulated locomotives
Vienna
New Zealand Railways
NZR B class
Double Fairlie
Avonside
Cape gauge
Mason Bogie
North America
Single Fairlie
Swindon, Marlborough and Andover Railway
Ernest Ahrons
Europe
Baker valve gear
Germany
Edmund Heusinger von Waldegg

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