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Topic: Walschaert valve gear

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In the News (Fri 25 Apr 14)

  Walschaert valve gear - Wikipedia, the free encyclopedia
The Walschaert valve gear on a Pennsylvania Railroad E6s
The Walschaert gear had the advantage that it could be mounted entirely on the outside of the locomotives, leaving the space between the wheels and frames clear; this caused adoption first among some articulated locomotives.
This condition precludes adjustment of the valve gear by altering the length of the radius rod.
en.wikipedia.org /wiki/Walschaert_valve_gear   (978 words)

 Valve gear - Wikipedia, the free encyclopedia
The Walschaert valve gear on a steam locomotive (a PRR E6s).
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.
A key flaw in all of these valve gears is that the same valve motion operates the exhaust valve as well as the inlet valve, making it much harder to achieve the desirable valve events on both the inlet and the exhaust at the same time.
en.wikipedia.org /wiki/Valve_gear   (645 words)

The reverse arm (reach rod or the yoke in Baker gear) is the lever that changes the valve gear between forward and reverse.
In general, the shorter the length of a swinging rod and the larger the angle of swing, the greater is the distortion added to the valve gear from that rod.
The center of the valve and the center of the cylinder or valve ports are compared and their difference is printed to the screen as valve position.
www.nmia.com /~vrbass/steam/valve/instruct.htm   (7452 words)

 Locomotive Boilers and Engines
68-a it is obvious that the motion of the valve is obtained from the crosshead and an eccentric crank attached to the main crank pin.
The Walschaert gear is operated by a reverse lever in the same manner as the Stephenson gear.
In the Stephenson gear, a movement of the reverse lever causes the link to be raised or lowered, the link block remaining stationary, whereas in the Walschaert gear, the link remains stationary and the link block is raised or lowered.
www.sdrm.org /faqs/boilers/page89.html   (687 words)

If the valve gear has been accurately designed, constructed and adjusted, when the main pin is placed on either dead center the link will be in such a position that when the radius rod is raised and lowered through the link there will be no forward or backward motion of the radius rod.
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.
In such a design the timing relationship between the gear connecting rod and the main pin is correct when the gear connecting rod is moved to the identical point of the swing of the gear connecting rod when the main pin is on either the front or back dead centers.
www.jghtech.com /html/ecc-crank-2.html   (1112 words)

The link of a Walschaert valve gear, or the gear connecting rod of a Baker valve gear, receive their reciprocating motion from the eccentric rod which is driven by the rotary motion of the eccentric crank pin.
In order for either of these valve gears to provide correct steam distribution to the cylinder, the reciprocating motion, or forward and backward swing, of the Walschaert link or the Baker gear connecting rod must occur in specific relation, or timing, to the rotation of the main pin.
After completing the construction and assembly of the valve gear, adjustments are made to the various components in an effort to compensate for any dimensional discrepancies that may exist.
www.jghtech.com /html/ecc-crank-1.html   (876 words)

 The Project Gutenberg eBook of The Traveling Engineers' Association
A piston valve is a cylindrical spool-shaped valve constructed with packing rings much the same as the steam piston that moves through the cylinder, except that a piston valve is double or composed of two pistons connected by center rod or spool working in a bushing of equal diameter.
A direct motion valve gear is one in which the valve moves in the same direction as the eccentric rod, that is doing the work, in many cases no rocker arm is used.
With a direct valve gear and an outside admission valve, the eccentric will be a quarter of a turn or 90 degrees ahead of the crank pin and advanced enough to move the valve the amount of the lap and lead.
www.gutenberg.org /files/17783/17783-h/17783-h.htm   (19812 words)

 Early Locomotive Valve Gear   (Site not responding. Last check: 2007-11-01)
One of the early employees of W. Bagnall Ltd one known instance of a locomotive not built by Bagnall having the Price valve gear and this is KILRUSH a Gresley locomotives of the London and North Eastern Railway brief.
In early one of the valve gears to the Windows the BR in three versions Deutsche Reichsbahn Deutsche Bundersbhan and the K.P.E.V operational Walschaert s valve gear from a pot boiler to a locomotive type boiler from slide Find the best information on railways and railroads around the world.
valve gear as fitted to early Roundhouse Lady Anne and Dylan locomotives and also in a slightly shorter form to the L and B locomotive of this valve gear as fitted This site is an anthology of th and early th century railroading.
vlv.worflume.com /early-locomotive-valve-gear.html   (654 words)

 Willamette Geared Steam Locomotives Were Different
The slide valve system was used on all standard and superheated Shays built up until the introduction of the improved "Pacific Coast" model in 1927.
The superior Walschaert valve gear was used on all Willamettes manufactured.
The square valve chest covers on those units with slide valves and the rounded covers on those with piston valves were turned or positioned facing outward, away from the boiler.
www.gearedsteam.com /willamette/different.htm   (926 words)

 Bulleid Society - Rebuild Vave Gear
One of the main reasons for rebuilding the Bulleid Pacifics were the problem encountered with the chain driven valve gear, which was enclosed in an oil bath between the frames.
As Bulleid's valve gear used outside admission it was decided to keep this for the outside cylinders but a new casting was made for the inside cylinder incorporating standard inside admission.
Below is a diagram showing the layout of the valve gear used in the rebuilds.
www.locos-in-profile.co.uk /Bulleid_Society/pages_main/archibald_valve_gear.html   (109 words)

 Stephenson Valve Gear - Trains.com Forums
There is a clevis at the end of the valve stem that fits around the top end of the rocker arm and is pinned to it, with threads for adjustment and a lock nut to keep the adjustment from changing in operation.
The entire gear is rather more complex than Walschaerts valve gear, so modeling it accurately is a job for only the most severely-afflicted rivet counter.
The Spectrum 2-8-0, Union Pacific 618 is suposed to have Stephenson Valve Gear.
www.trains.com /TRC/CS/forums/836478/PrintPost.aspx   (1303 words)

 Railfan.net Forums - Side-Rods
This sets the valves in the steam chest to admit steam to whichever side of the pistons needed to drive the locomotive in the intended direction.
With the reverser in full gear (forward or backward) this sets the length of the valve stroke at its longest possible setting which allows steam to be admitted at full boiler pressure for the entirety of the piston stroke.
This reduces the lenght of the valve stroke which reduces the percentage of time during the piston stroke that live steam from the boiler is actually being admitted to the cylinder.
forums.railfan.net /forums.cgi?board=SteamGeneral&action=display&num=1109285738   (1593 words)

 Steam locomotive basics - section 6, valve gear
he function of the locomotive valve gear is to regulate the movement of the valves so that steam is admitted and exhausted from the cylinders in relation to the position of the pistons.
In the Walschaert valve gear, which was common among many railway companies except for the Great Western, fore-and-aft movement of the valve spindle is controlled by both the combination lever and the expansion link.
Adjustment to the length of valve travel is made by raising or lowering the position of the radius rod within the expansion link.
www.greatwestern.org.uk /basic6.htm   (292 words)

 Trouble Shooting
If the slide valves still do not seat properly, it may be necessary to file the valve block opening slightly so that the valve block is a slip fit in the valve and the valve rest squarely on its face.
Check valve balls occasionally stick shut and can sometimes be freed by tapping the valve body with a small wrench or by topping off the water supply and pumping vigorously for several strokes.
When the piston is at front dead center and the valve gear set for forward running, the edge of the slide valve should be just beginning to uncover the forward steam port.
www.southernsteamtrains.com /manual/trouble-shooting.htm   (1628 words)

 Locomotive Boilers and Engines   (Site not responding. Last check: 2007-11-01)
The factors in favor of the Walschaert gear are largely mechanical ones which may be designated as easily accessible parts and a less amount of care in maintenance.
A study of the action of a valve on a given locomotive, when operated by means of a Walschaert gear and also a Stephenson gear, gave the results shown graphically in Figs.
The conditions for both the head end and crank end of the forward motion, in both Stephenson and Walschaert gears are represented in Figs.
www.sdrm.org /faqs/boilers/page92.html   (403 words)

 Steam Locomotive Valve Gear
Only the five assembled valve gear frame styles and the locomotives are shown...
The function of the locomotive valve gear is to regulate the movement of the valves so that steam is admitted and...
Valves and Valve Gears for Steam Locomotives, GS Lake and A. Reidinger,...
www.3d-perfection.com /steam-locomotive-search/4/steam-locomotive-valve-gear.html   (244 words)

 "St Louis-San Francisco 4-6-2s"
They originally were equipped with Stephenson valve gear and inside piston valves.
In 1930 they were rebuilt with piston valves and Walschaert valve gear.
They were built with Baker valve gear with 1016, 1018, 1023, 1031, and 1037 receiving Walschaert valve gear in the 1930s.
donsdepot.donrossgroup.net /dr661.htm   (260 words)

 phorum - 'Bach Man' Message Board - Re: Correct position of valve gear on Annie?   (Site not responding. Last check: 2007-11-01)
I've got a new Annie with the Walschaert Valve Gear, that experienced a couple of mechanical failures during break-in due to loose screws on the Crank Pins of the center wheelset.
To keep it simple, on the left (firemans side) with the crankpin at 6 o'clock, the return crank should be to the rear of the wheel axle.
Valve timing also varies with left or right lead, type of steam valves and type of valve gear.
www.bachmanntrains.com /home-usa/board/read.php?f=1&i=89273&t=89266   (1086 words)

 myLargescale.com Forums - Most Beautiful IMHO Live Steam Locomotive - All About Your Garden Railroad & G Scale Trains
I was kind of curious to see what you guys were going to do for valve gear on the Bulleid, considering that the real ones were built with a unique chain-driven valve gear encased in an oil bath, which proved to be quite troublesome in operation.
The famous chain driven valve gear from Bulleid's pacific locos was basically Walschaert but used chains to transmit the drive instead of rods.
Gear was Walschaerts on 4 locs, 1 loc was fitted with Caprotti and 1 with Dabeg poppet valves.
www.mylargescale.com /forum/topic.asp?TOPIC_ID=38098&whichpage=6   (1070 words)

 Mining equipments in the 1940's
Gear-stripping is absolutely eliminated and gear changes can be made smoothly at much higher speeds than with the usual system of sliding and clashing gears.
Gearing between motors and driving-wheel axles may be either single, double or tripe-reduction.
Modern construction includes: splash lubrication; alloy steel gears and shafts; anti-friction bearings; lever controlled rope drums for instantaneous drum friction; "free wheeling" rope drums to save positioning time; "lift in-drop out" cutter-chain clutch which cannot be accidentally engaged; and under-winding feed rope.
www.coaleducation.org /coalhistory/tech2/e40.htm   (2761 words)

 How to Animate Walschaert's Valve Gear using Abacus Train Sim Modeller v1.1
Walschaert's valve gear does not provide power on a single stroke.
A vacuum is created in front of the piston head, which tends to pull the piston forwards, and this is assisted by steam applied from behind.
This breaks the vacuum, and causes live steam to be injected into the space ahead of the advancing piston.
steam4me.railpage.org.au /trainsim/tutorials/animate.html   (1182 words)

 Steam Locomotive Walschaert Valve Gear Animation   (Site not responding. Last check: 2007-11-01)
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 inventor's name was (Egide) Walschaerts (pronunciation: val-sherts), but the design was patented under the name Walschaert for political reasons.
Downloadable freeware simulations of every kind of valve gear you've ever heard of by Charles Dockstader (CA).
home.new.rr.com /trumpetb/loco   (529 words)

 Railway Age Mechanical Articals
The exhaust passages are gradually reduced in area from the valve bushings to the base of the exhaust pipe in such a way that the cross section at no point is larger than a preceding section.
Walschaert valve gears are supplied with an additional lever interposed between the radius rod and combination lever and pivoted at the rear end of the back valve cylinder head.
The maximum travel obtained is nine inches, and in order to take full advantage of this travel and permit finer adjustments of cutoff, the Ragonnet power reverse gear is operated from the cab by a reverse lever and quadrant cut with more than the usual number of teeth.
www.sbrhs.org /Pages/mechanical.html   (4239 words)

 Stock code 1471 3 1   (Site not responding. Last check: 2007-11-01)
Well-made demonstration model of Walschaert's valve gear constructed in burnished steel with wooden case.
The model operates very smoothly and the gear can be reversed with the screw reverser mounted on top.
The brass plate attached is inscribed "Walschaert Valve Gear.
www.stationroadsteam.co.uk /archive/1912.htm   (53 words)

 Railroad Blueprint Page   (Site not responding. Last check: 2007-11-01)
Many varieties of valve gear were used on steam locomotives over the years, but Walschaert, which was developed in Europe in 1844, became one of the most popular.
It was not until around 1900, however, that Walschaert was commonly applied to locomotives in the U.S. Print size is 18x24.
If there are other types of valve gear that you would like to see diagrams of, please drop me an e-mail at the address below.
home.teleport.com /~rks/blueprnt.htm   (626 words)

 1522 FAQ   (Site not responding. Last check: 2007-11-01)
The auto engine uses valves to control the fuel/air going into the cylinder and 1522 uses valves to control the steam in a similar manner.
Both engines use a mechanical feedback to control the operation of the valves - the auto via a camshaft and lifters while the 1522 uses various linkages, in a Walschaert's valve gear arrangement, driven by the eccentric arm on #2 driver.
The two lubricators, one on either side of the engine, use a drive arm from the locomotive's valve gear to create a pumping motion to force steam oil to various bearings on the drive train as well as lubricating the piston and valves in their cylinders.
www.frisco1522.org /FAQ.htm   (4235 words)

 Steam Engine
Valve gears control the entry and exit of steam into and out of the cylinders.
The most widely used system of controlling the valves was invented in 1844 by the Belgian engineer Eyidle Walschaert.
The movement for the valves and pistons inside the cylinders transmits driving action to the wheels through interconnecting rods.
oldiron.8m.com /steam.html   (274 words)

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