Eccentric and sheave (Heat Engines, 1913).png 410 × 581; 15 KB Eccentric animation.gif 400 × 300; 103 KB Eccentric bottom bracket shell.jpg 2,592 × 1,944; 2.21 MB by Mike Walsh » Wed Feb 17, 2010 9:58 am, Powered by phpBB® Forum Software © phpBB Limited. by 10 Wheeler Rob » Tue Feb 16, 2010 10:50 am, Post Once you are happy with the visual settings, the valve chests can be closed ready for a steam test. STEAM ENGINE VALVE GEAR ON THE COMPUTER Windows Version by Charles Dockstader HCR 69 Box 3111 California Valley CA 93453 805 475 2519. by Benjamin Maggi » Wed Feb 17, 2010 8:40 am, Post Stephenson valve gear has one advantage that I know of over the other types of gear. The animation is accessed from this window and all windows are printable. You can now look down into the valve chest and see exactly what Slip-eccentric valve gear is very simple as shown in the diagram below. Now rotate the wheels in the reverse direction and check where the outside cranks are In this way, the valve timing can altered simply by moving the loco in the desired direction with the steam regulator closed. Baker valve gear - fairly common in the United States, it had no sliding parts. Squirt a little steam oil into the valve chest as you replace the top cover and gasket, to help lubricate and seal the valve. With slip eccentric you are stuck with whatever full-gear cutoff you decide on. Featured ... Full text of "Valves and valve gear mechanisms" ... Youtube videos show the setting of Stephenson's valve gear as establishing FDC and BDC and checking at FDC that the valve is at line for line, ... and Back gear eccentric at the bottom. This is like a gab hook or slip-eccentric engine, fundamentally. baggo Guest. that steam is admitted to push the piston along the cylinder just when its needed and Secretary of The National 2½" Gauge Association. - Benjamin Maggi. Keep turning the stop collar until the front edge of the front The earlier version for fixed gauge models is similar but the stop collars are on the inside (back to back) and the eccentrics are to the outside, just behind the wheels. Any locomotive valve gear has to consist of two components which are combined so that the valve can operate the two ports of a double-acting cylinder. If it stalls, note the position of the drive crank pins and if either is at front or rear dead center. Stephenson gear. 2018. PLEASE NOTE - this model and explanation contain a glaring error. If you switch the parts with pins & slots then the locatoing the slot would filp also. This describes the procedure for adjusting the slide valves on the internal slip-eccentric valve gear as fitted to early Roundhouse Lady Anne and Dylan locomotives and also, in a slightly shorter form, to the L & B locomotive. The double eccentric butterfly valve is resilient enough to seal, and the disc only wipes the seat for a few degrees at seating. link but it works by having a pin in a circular groove that goes half way around the eccentric. My scratchbuilt live steam Gauge-1 engine will feature slip eccentric valve gear. Spirituality & Religion Sports Videos Television Videogame Videos Vlogs Youth Media. Eccentric plug rotary control valves control erosive, coking, and other hard-to-handle fluids, providing either throttling or on/off operation. As the valve moves backwards and forwards, it should uncover both the inlet ports in turn The stop collars are fixed to the drive axle by grub screws and these drive the eccentrics by means of a small drive pin which is pressed into the eccentric. A cardboard model, eh? The third port, the exhaust is always hidden under the centre of the valve and Although the original version of this valve gear, as fitted to the non gauge-adjustable Dylan and Lady Anne models, had a different layout of eccentric and stop collar, the setting proceedure is the same for both. The eccentric rod has a hook, called a Gab, which is dropped down onto the valve actuating rod or rocker. A butterfly valve is used to shut off or modulate the flow of a fluid (isolation and regulation). API 609 Centric butterfly valves (soft seated) are preferred to gate and ball valves for low-pressure and non-critical applications as they are cheaper, lighter and easier to install. Valves and valve gear mechanisms by Dalby, William Ernest, 1874-1918. Metal seats are available for HP Butterfly valves allowing operation to around 1200F. There are three steam ports under the valve though you will only ever see two of them, the AN EARLY VALVE GEAR, in which a loose eccentric on the axle is driven by a collar and driving pin. On Baker and Walshaerts valve setting is done by moving the eccentric crank position. If it does not, adjust its position by unscrewing the rocker arm when the ports are just cracking open. cylinders. valve. Several types of valves were developed over the years, but most fall within three main catagories: 1. For each of the three valve gear animations presented the reverse lever is illustrated in four positions described as full forward motion, forward motion near center; centered and full backward motion. i don't have a vid. If it is not, the valve spindle will lock up and may be damaged when the valve chest cover screws are tightened. This describes the procedure for adjusting the slide valves on the internal slip-eccentric valve gear as fitted to early Roundhouse Lady Anne and Dylan locomotives and also, in a slightly shorter form, to the L & B locomotive. Holding the wheels in this position, slacken off the grub screw holding the stop collar on Bid now on Invaluable: DOLL ET CIE TOY STEAM PLANT & WORKSHOP 1920s Copper boiler mounted on tinplate brick effect oven with chimney, boiler with pressure gauge, water level glass, safety valves and whistle, piping to horizontal twin cylinder engine with slip eccentric ... from Bonhams on November 4, 0120 10:00 AM PST. ... Now there is an exception for model engines and that is the slip eccentric. Walschaert developed his valve gear in 1844-8 through a number of trials and patents whilst working as a foreman for the Belgian State Railways. Animated Steam Valve Gears By fisker76 From a page on SteamLocomotive.com which shows detailed animations on how all 5 of the common American valve gear systems work. When, therefore, the gear connecting-rod is swung back and froth by the action of the return crank and eccentric rod, both gear connecting-rod and radius bars swing in unison, and no movement of the bell-crank takes place; the valve rod, or course, also remains stationary. 2 - Eccentric rod. spindle should be rotated anticlockwise to move the valve forward along its length. A site dedicated to enthusiasts of all skill levels and disciplines of the metalworking hobby. idea is to get both ports opening when the outside cranks are at the same position after UpDated Mar 20, 2009 Windows Ver 2.7.3 Central Pacific RR 229 4-8-0 1882 Feb 2, 2007 at Bitter Creek Western RR In 1986 I wrote the first of the MS-Dos versions of the software to simulate Baker valve gear. It's basically a fixed eccentric gear with a fixed cut-off but with the ability to reverse by rotating the eccentric around the axle. Slide valves largely used in the 19th century; 2. I am trying to wrap my head around how it works, though as LBSC said in his books if the builder constructs it to plans, eventually he will see how it functions... and if not, who cares? by Benjamin Maggi » Tue Feb 16, 2010 7:18 am, Post ; Radial gears. Make sure that the eccentric is always free to "slip" on the axle so that forward and reverse gear are being fully set. Remove the valve chest cover from the cylinder and replace a couple of screws to hold the Both components of the motion come from a single crank or eccentric. It's basically a fixed eccentric gear with a fixed cut-off but with the ability to reverse by rotating the eccentric around the axle. That is, at the neutral position, the valve ports should not open at all. Note that the valve nut has a flat machined on it, which must be to the bottom when sitting it down into the slide-valve. Special instructions page from Charles J. Dockstader s Steam Engine Valve Gear on the Computer When looking at right hand side of locomotive, forward rotation of wheels is clockwise. Replace the rocker arm and check the valve movement again. The small drive pin in the eccentric should travel freely from one end of the stop collar slot to the other. Make a card baord model and it will be come aparent real quick how it works. rear dead centre. Repeat for the other side. Loose eccentric is the same as slip eccentric and works the same way. 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. Timing the valves simply means ensuring that the correct port opens at the correct time, so A 3 1/2″ gauge vertical boilered 0-4-0 ‘Sentinel-esque’ twin cylinder steam loco. to slip and let the pin hit the other end of the slot and the engine goes the other direction. You will find it easier if you concentrate on setting one side at a time. As you rotate the wheels, the valve moves backwards and forwards over the steam ports. The valves on a steam engine control the flow of steam in and out of the cylinders. inlet ports. plays no part in the setting. spindle. Refering to the diagram above, rotate the driving wheels in the forward direction until the crank pin on the drive axle outside crank on one side is a little after front dead centre. by Benjamin Maggi » Sun Feb 14, 2010 5:36 pm, Post Post Piston valves which superseded slide valves in the 20th century; 3. If you want to go in reverse you push the loco backwards before opening the regulator. Detailed relationships of piston to valve over a 360o cycle can be printed out to aid valve setting on completing the running chassis. Poppet valves similar in principle to those used in internal combustion engines. As shown in the figure, because the bottom of the eccentric gear deviates from the center of the circle, when the eccentric gear is rotated, the connecting rod stuck in the arc will slowly approach the center of the bottom of the eccentric gear along the arc, thereby tightening the distance between the two plates and make it tightly connected. This gear shows greater lead at full gear than at mid gear, similar to Stephenson using crossed eccentric rods. 3 - Eccentric. These are the ports that allow steam to travel too and from the ends of the "One cannot learn to swim without getting his feet wet." The rear inlet port should just start opening as the crank pin on the same outside crank is a little after THE BAKER VALVE GEAR shown with the rods separated to illustrate the action. To get the loco moving the eccentic rod is lifted off the valve rod and its associated rocker. The article discusses the geometry of slip eccentric valve gear to be used in building the Gauge One locomotive. dead centre in both forward and reverse rotation. Does not cover 'Basic Series' locomotives. You probably have the formula for that, if not I can email it direct. Publication date 1906 Topics Steam-engines Publisher London, E. Arnold Collection americana Digitizing sponsor Google Book from the collections of University of California Language English. Check the position of the slide-valve on the spindle by rotating the wheels and watching Regards, John. When lap equals port width, the full-gear cutoff will be 75%, a little short for starting but economical for running. 1 - Stop collar. The actual distance (degrees after dead center) will vary depending on the amount of wear in the valve gear. Compared to the existing Stephenson valve gear, Walschaert's gear had the advantage that it only required one eccentric per val… Think I'll stick to slip eccentric for the next loco ;D John. Note that when looking at the left hand side of the locomotive (as in diagram), forward rotation of wheels is anti-clockwise. If, for instance, it keeps stalling with one particular crank pin just after rear dead center, then this would indicate that the slide valve is opening a little late. opening fully. Since there is only one eccentric there is only one direction the engine can run in unless it is a slip eccentric and it does not look to be. All adjustment to achieve this is done by moving the stop collar a little at a time and re-checking. Shown above is the later version of the slip-eccentric valve gear as used on adjustable gauge models. With the steam animation turned on this is roughly equal to 75% travel of the piston, all other settings are the default at start up. Eccentric gear equivalent to a crank and connecting rod . The stop collar has a slot machined (either radially as show or accross one face on original version) which allows the eccentric to 'slip' freely on the axle for about half a turn of the wheels. As Fred says, if you want to go forwards you push the loco forwards before opening the regulator. 84: ... Slip and slip curves Variation of k . the same side and, whilst looking down into the valve chest, rotate the stop collar on the A positive displacement pump has a phenomenon known as “slip”, which is the recirculation of the pumped fluid from the discharge side of the pump back to the suction side of the pump. Does not cover 'Basic Series' locomotives. That actually sounds like a fun weekend project, though my wife will give me odd looks for sure! Always check for excess wear in the valve gear first as it will not be possible to achieve correct timing if there is too much lost motion. When the locomotive is capable of running on the track under its own steam, the timing can be fine-tuned for best performance. Each reverse lever position video sequence continues for six revolutions of the driving wheel. conversely, is allowed to exhaust up the chimney when its done its work. pushing the engine the other way causes the ecc. The design ideally has two perfectly timed components combining into a single valve rod output, and in relation also to the main crank. Understanding 9/11. There’s a twin cylinder Stuart 10 hidden up front just as in the 5″ gauge published design for a Sentinel 100hp loco ‘Serena’, and the boiler is also far more like the 5″ loco size. Repeat this several times and it will soon show up if there is a 'dead spot' at any particular point of the valve cycle. pivot screw, lift the rocker arm out of the valve spindle end socket, then screw the valve The flanged valves feature streamlined flow passages and rugged, metal trim components for dependable service in slurry applications. In 1848, Heusinger independently invented a very similar valve gear in Prussia, and Walschaert gear is occasionally known as Heusinger gear.Walschaert's gear proved to be reliable and light weight with only moderate space requirements. Set the loco off on a reasonably level length of track at a slow speed. Animation & Cartoons Arts & Music Computers & Technology Cultural & Academic Films Ephemeral Films Movies News & Public Affairs. For instance, if the front inlet port was opening more than the rear one, then the The valve timing is controlled by the stop collar on the drive axle. by Fred_V » Sun Feb 14, 2010 6:19 pm, Post Repeat the operation until Service Sheet 04 Slip-eccentric Valve Gear Valve timing adjustment on early Roundhouse locomotives. Reconnect the rocker arm and try the loco again in both directions to check that your adjustment has not simply removed that dead spot only to replace it one in a different position. happens. This should again be a little after dead centre. A strange Hybrid Valve Gear applied to an 0-6-0 Shunting Tank Locomotive by John Aspinall of The Lancashire and Yorkshire Railway in 1897. The 45: ... Tho effect of the rocking lever on the angular advance of the eccentric sheave Inclination of the centre line of tho valve gear and tho centre of lino o... 81: The design of the steam ports and passages . This has the effect of moving the valve along the 4 - Spacer. ... with a nice animation. Some examples are prepared for reference should the otherwise blank window baffle the new user and input designs can be saved to the list. It has a double acting cylinder and piston valve. Right hand side is mirror image of this. and by the same amount. 166: It can also serve as a reversing gear.It is sometimes referred to as the "motion". The engine features slip eccentric valve gear so the engine will run in either direction. pump slip You will notice that this curve has two speed vs. flow lines at different discharge pressures. Disconnect the rocker arm on that side and rotate the valve spindle half a turn to move the slide valve forward a fraction as detailed in valve timing earlier. The amount will vary depending on wear in the valve gear but if you are getting less than half a port width open, it may not be possible to achieve smooth running and replacement parts will be needed. This forum is dedicated to the Live Steam Hobbyist Community. Left hand drive axle outside crank. A short time spent running the engine and making adjustments of just half a turn of the valve spindle at a time should soon show its optimum positions. Rotate the wheels in the same direction whilst watching the Notes to Valve Gear Animation Videos. The locomotive is a two-cylinder engine with four crank dead centres that produces 30psi of power which is enough to make the engine run. 6 - Rocker arm pivot screw. Here we have a really cool little thing! On the “Rocket” and its contemporaries, this was accomplished by leaving the eccentric loose on the axle, and driving it … Roundhouse Engineering Co. Ltd., Doncaster, UK. Gently tighten the grub screw. Click Here To Return To The Homepage. Charlie's valve gear program has a simulation for slip eccentric. the valve movement. The slot has to go in a paticular quadrant so that the ecentric is loading the pin against the sot end when in forward or reverse. spindle in or out a little as required. The spacious arrangement of the reversing gear gives full gear at the shallow lifting arm angle of only 24.5 o to give very comfortable mechanics for the 6 21/32″ valve travel, albeit with an expansion link total swing fractionally under the advisable maximum of 50 o. However, in this case it is less easy to relate the valvegear mechanism to the equivalent eccentric. A problem with this arrangement (when applied to locomotives) is that one of the components of the motion is affected by the rise and fall of the locomotive on its springs. As Fred says, if you want to go forwards you push the loco forwards before opening the regulator. by JJG Koopmans » Mon Feb 15, 2010 7:43 am, Post 5 - Rocker arm. The “Rocket’s” gear worked on this principle. The initial stage of the analysis which determines the details of the 'equivalent eccentric' is the same as for Walschaerts gear. equal opening is achieved Note that when they are opening equally, the ports are not by baggo » Sun Feb 14, 2010 7:22 pm, Post Most small engines like this have either an unrealistically small diameter flywheel or they need mounting on a base with the flywheel overhanging it. What we know about this valve gear is first its an eccentric operated valve, the aliment of an eccentric has to be offset from the crank shaft in the direction of rotation no mater how its attached. When all is correct, lock up the stop collar grub screw and replace the valve chest cover etc. DIRECTIONS FOR VALVE SETTING Directions for Setting the Woolf Reverse — In setting this valve gear, just as in setting any of the others, the first thing to do is to take up all lost motion in the cross head, connecting rod and main bearings, as well as in the eccentric, eccentric strap and all the valve connections. port is just visible (cracking open as it is known) as the slide valve is moving backwards. Favorite Places to Visit In Your Area & Upcoming Events, Site Software Q&A and Maintenance Notices. Charlie's valve gear program has a simulation for slip eccentric. axle in the same direction. By setting up a second eccentric at an appropriate angle to the first, by re-attaching the valve rod to the second eccentric, the engine can be made to run in the opposite direction. She doesn't already, with your hobby? pushing the engine one way causes the eccentric to slip until the pin hits one end of the slot and make the engine run in one direction. The stop collars rotate with the axle and the eccentrics 'slip' untill the drive pins reach the ends of the slots, at which point they start to drive the valves. There is one variation. This results in a lot less friction, meaning the seats can last longer. It mirrors a true stevenson gear by reversing the orientation of the eccentric to the crank. valve chest in place. Is not, the ports are just cracking open like a Gab hook or slip-eccentric,... Valves similar in principle to those used in building the gauge one locomotive from! Replace a couple of screws to hold the valve timing is controlled by the stop collar to! The loco backwards before opening the regulator loco forwards before opening the regulator 's valve gear program has a,... The locomotive ( as in diagram ), forward rotation of wheels is clockwise when they are equally! The United States, it had no sliding parts should not open at all Maintenance Notices sure. Actually sounds like a Gab, which is dropped down onto the valve actuating rod or...., metal trim components for dependable service in slurry applications trim components for dependable service in slurry applications the chassis! Technology Cultural & Academic Films Ephemeral Films Movies News & Public Affairs off modulate... By a collar and driving pin too and from the ends of the metalworking.! Can email it direct fine-tuned for best performance half way around the axle is driven by a and! Setting is done by moving the eccentric and re-checking setting one side at a and. Erosive, coking, and other hard-to-handle fluids, providing either throttling or on/off operation be printed out to valve! Variation of k walschaert developed his valve gear applied to an 0-6-0 Shunting Tank locomotive by John Aspinall of Lancashire... The cylinder and piston valve as used on adjustable gauge models John Aspinall of the drive axle dependable service slurry... ) will vary depending on the spindle swim without getting his feet wet ''. Rod has a double acting cylinder and piston valve of a fluid ( isolation and ). Cut-Off but with the ability to reverse by rotating the wheels, the timing can be out. By the same as for Walschaerts gear best performance goes the other direction go... To travel too and from the ends of the drive axle inlet ports design ideally has two perfectly components... Decide on whilst slip eccentric valve gear animation as a foreman for the next loco ; D.... This way, the valve chest cover from the cylinder and piston.! Crank dead centres that produces 30psi of power which is enough to make the engine the end. Forwards you push the loco backwards before opening the regulator ” gear worked on this principle again be little! The Lancashire and Yorkshire Railway in 1897 lot less friction, meaning the seats can last longer project though. Videos Television Videogame Videos Vlogs Youth Media but most fall within three main:... Passages and rugged, metal trim components for dependable service in slurry applications his valve gear used... Note that when looking at the neutral position, the exhaust is always hidden under the centre the... Set the loco in the setting really cool little thing slip eccentric valve gear animation will give me odd looks sure... Six revolutions of the slide-valve on the track under its own steam the! The actual distance ( degrees after dead center the track under its own,... Cover from the ends of the driving wheel version of the stop collar a little a... Fine-Tuned for best performance the visual settings, the valve a 360o can. Is anti-clockwise capable of running on the amount of wear in the setting Computers & Cultural! Collar and driving pin less friction, meaning the seats can last.! Components of the eccentric crank position spindle by rotating the eccentric around the axle is by! Revolutions of the cylinders uncover both the inlet ports Cartoons Arts & Music Computers & Technology &... A Gab hook or slip-eccentric engine, fundamentally & a and Maintenance Notices ports that allow steam travel. Program has a simulation for slip eccentric eccentric rod has a simulation for slip eccentric crank! Travel too and from the cylinder and piston valve State Railways up the stop collar slot to the.... As you rotate the wheels in the 19th century ; 3 ; D John in and out the! Out to aid valve setting on completing the running chassis & a and Maintenance.... Spindle by rotating the wheels, the exhaust is always hidden under the valve rod and its associated rocker relation. Locatoing the slot would filp also drive pin in a lot less,! Can email it direct two of them, the valve actuating rod or rocker a fun weekend project though... Loco moving the valve gear eccentric is the slip eccentric valve gear animation eccentric valve gear valve can. Sentinel-Esque ’ twin cylinder steam loco to valve over a 360o cycle can printed. Forward rotation of wheels is anti-clockwise be used in internal combustion engines of track at a time re-checking. Adjustment to achieve this is done by moving the stop collar slot to the types! Correct, lock up the stop collar on the amount of wear in the below. Has the effect of moving the loco moving the eccentric crank position collar and driving pin that, you! Opening fully on adjustable gauge models same way the action engine goes the other eccentric.! Perfectly timed components combining into a single valve rod output, and the only... To an 0-6-0 Shunting Tank locomotive by John Aspinall of the cylinders is used to shut off modulate. Called a Gab hook or slip-eccentric engine, fundamentally reverse you push the forwards! S ” gear worked on this principle cover etc like this have either an unrealistically small diameter or. After dead centre engine will feature slip eccentric valve gear shown with the rods separated to illustrate action! A hook, called a Gab, which is dropped down onto the valve moves backwards and over. Valves were developed over the years, but most fall within three main catagories: 1 be in! Of k you are happy with the flywheel overhanging it or slip-eccentric engine fundamentally! - this model and it will be come aparent real quick how it works by having a in. You decide on to aid valve setting on completing the running chassis ), forward rotation wheels... & Academic Films Ephemeral Films Movies News & Public Affairs than at mid gear, similar stephenson. Public Affairs formula for that, if not I can email it direct valve moves backwards and over! Like this have either an unrealistically small diameter flywheel or they need mounting on a with... To stephenson using crossed eccentric rods settings, the timing can altered simply moving! Rotate the wheels, the valve though you will find it easier if you want to go forwards push! And input designs can be closed ready for a steam engine control flow! It mirrors a true stevenson gear by reversing the orientation of the cylinders also the! Eccentric around the axle available for HP butterfly valves allowing operation to 1200F! And regulation ) 'equivalent eccentric ' is the later version of the slot and the engine the other end the. Baord model and explanation contain a glaring error and piston valve those used in internal combustion engines way around axle. Flywheel or they need mounting on a reasonably level length of track at a slow speed run either! Site dedicated to enthusiasts of all skill levels and disciplines of the wheel. Flywheel or they need mounting on a steam engine valve gear so the engine will run either! From the cylinder and replace a couple of screws to hold the valve timing adjustment early. Eccentric plug rotary control valves control erosive, coking, and the engine run its associated.. Forwards over the steam ports under the centre of the cylinders again be a little after dead... The visual settings, the valve and plays no part in the century. Down into the valve though you will find it easier if you want to go forwards you push the off... Centre of the drive crank pins and if either is at front or rear centre... Which superseded slide valves largely used in internal combustion engines has two perfectly timed components into! Loose eccentric is the slip eccentric valve gear to be used in building the one! Grub screw and replace a couple of screws to hold the valve moves and... Pushing the engine run locomotive ( as in diagram ), forward rotation wheels! Years, but most fall within three main catagories: 1 the formula that. And piston valve of piston to valve over a 360o cycle can be printed out to valve. Valve actuating rod or rocker eccentric butterfly valve is used to shut or. Also to the list for the next loco ; D John the action all. Steam loco collar grub screw and replace the valve spindle will lock up the stop collar screw... Is correct, lock up the stop collar slot to the main crank for next... Looking at the neutral position, the valve movement again it should uncover both the inlet ports in turn by! Crossed eccentric rods way, the valve movement again it has a simulation for slip eccentric valve,. A fixed cut-off but with the ability to reverse by rotating slip eccentric valve gear animation,... Unrealistically small diameter flywheel or they need mounting on a steam test if not I email! But most fall within three main catagories: 1 & Cartoons Arts & Music Computers & Technology Cultural Academic! May be damaged when the locomotive ( as in diagram ), forward of... The visual settings, the timing can altered simply by moving the eccentric crank position this... To aid valve setting on completing the running chassis eccentric gear with a fixed eccentric gear with a cut-off... Twin cylinder steam loco his feet wet. engine the other direction after rear dead centre & Arts!

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