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Topic: Caprotti valve gear

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	Reference.com/Encyclopedia/Piston valve
		A piston valve is a device used to control the motion of a fluid along a tube or pipe by means of the linear motion of a piston within a chamber or cylinder.
		It is difficult to lubricate slide valves adequately in the presence of superheated steam
		Where poppet valves are used, a different gear, such as Caprotti valve gear is needed.
	www.reference.com /browse/wiki/Piston_valve (806 words)

	tScholars.com \| Caprotti valve gear
		Close-up of the British Caprotti valve gear on the preserved BR standard class 5 73129.
		The Caprotti valve gear is a type of steam engine valve gear invented by the Italian Arturo Caprotti.
		In the 1950s Caprotti valve gear was improved and this British Caprotti valve gear was fitted to the last two British Railways-built fl fives 44686/7, the last 30 BR standard class 5s, numbers 73125-54 and the unique BR standard class 8 71000 Duke of Gloucester.
	www.tscholars.com /encyclopedia/Caprotti_valve_gear (216 words)

	NOTTINGHAM VICTORIA - Steam Locomotive Design Topics 2
		The valve shaft 7 is controlled by the two shafts 4 & 5, and transmits motion to the piston valve via a rocking lever attached to the valve spindle in the middle 8, as opposed to the usual arrangement of at the end.
		The valve gear was fitted to the pacific locomotives Bulleid designed, but did not perform well, often leaking oil from the sump and sometimes igniting, so from 1956 all 30 MN class and many WC and BB class engines were rebuilt with Walschaerts valve gear.
		Caprotti valve gear was invented in 1921 by Arturo Caprotti, and was a type of valve gear known as 'poppet', the valves admitting steam into the cylinders being operated by cams on a rotating camshaft.
	members.tripod.com /~TimothyPlatypus/NottinghamVictoria/SLDT2.html (919 words)

	5AT Valve Gear
		Eickhoff's points, the contribution of Walschaerts valve gear to the balancing issue is negligible as most of its inertia forces are out of phase with those of the main reciprocating masses, and the maximum acceleration (i.e.
		Porta's invention of valve liner cooling allows higher steam temperatures to be used without lubrication difficulties, and inertia forces are kept at manageable levels by the very lightweight construction made possible by designing the valves according to stress analysis rather than empirical rules.
		Note that this is one reason to reject Caprotti valve gear as finally applied to BR locomotives, as the valves were arranged to drop from their seats during drifting thus providing a full by-pass from one end of the cylinder to the other, precluding the build-up of cushioning steam pressure.
	www.5at.co.uk /FAQ5.html (687 words)

	Glossary of Railway Terms
		The anti-vacuum valves may be mounted on the steam chests or singly or in pairs on the smokebox when they are connected to the saturated side of the superheater header.
		A valve fitted on top of the boiler and often housed in a dome, is used by the driver to admit steam to the cylinders.
		Various types of valve and various locations for it were to be seen during the history of the locomotive but it was normally at the top of the boiler where the steam was hottest and usually in a dome.
	www.trackbed.com /pages/glossary_terms.htm (14451 words)

	Steam Valve (Site not responding. Last check: 2007-10-30)
		Valve gear - 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.
		Gresley conjugated valve gear - The Gresley conjugated valve gear was a valve gear for steam locomotives designed by Sir Nigel Gresley, chief mechanical engineer of the LNER, assisted by Harold Holcroft.
		Caprotti valve gear - The Caprotti valve gear is a type of steam engine valve gear invented by the Italian Arturo Caprotti.
	envelopes.vvvvvv3.com /steamvalve.html (665 words)

	Valve gear - Wikipedia, the free encyclopedia
		Gresley conjugated valve gear - Used on 3-cylinder locomotives.
		Walschaert gear was usually used for the outside cylinders.
		Joy valve gear - a design used extensively on the LandYR and LNWR in England, and elsewhere.
	en.wikipedia.org /wiki/Valve_gear (843 words)

	Precision Gear (Site not responding. Last check: 2007-10-30)
		Bicycle gearing - The gearing on a bicycle is the selection of appropriate gear ratios for optimum efficiency or comfort.
		Different gears and ranges of gears are appropriate for different people and styles of cycling.
		While a regular gear is optimized to transmit torque to another engaged member with minimum noise and wear and with maximum efficiency, a non-circular gear's main objective might be ratio variations, axle displacement oscillations and more.
	www.nelsonamtooling.com /precisiongear.html (584 words)

	INSTRUCTIONS FOR VALVE GEAR PROGRAMS Ver. P.7
		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.
		Adjusting the length of the valve rod or the valve stem moves the valve so that the lead is equal at both ends when the reverse arm is at its center.
		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)

	Fifth Gear (Site not responding. Last check: 2007-10-30)
		Among the new topics are: new geometry for gears fifth gear and pumps; new design approaches for planetary gear trains fifth gear and bevel gear drives; an enhanced approach for stress analysis; new methods of grinding fifth gear and gear shaving; fifth gear and new theory on the simulation fifth gear and its application.
		While a regular gear is optimized to transmit torque to another engaged member with minimum noise and wear and with maximum efficiency, a non-circular gear's main objective might be ratio variations, axle displacement oscillations and more.
		Caprotti valve gear - The Caprotti valve gear is a type of steam engine valve gear invented by the Italian Arturo Caprotti.
	www.thearmylink.com /fifthgear.html (735 words)

	73129
		CAPROTTI valve gear is considerably different in that uses cam actuated POPPET valves (similar to those in an internal combustion engine) to control the flow of steam into and out of the cylinders.
		A pilot valve in the regulator admits a supply of saturated steam to the underside of the poppet valves to close them before the main superheated steam reaches the cylinders.
		The British Caprotti valve gear, as it was known, overcame many of the earlier problems and as a result of the experience gained, it was decided to fit it to the new BR Standard Class 8P 4-6-2 no. 71000 Duke of Gloucester, and the final batch of 5MT 4-6-0 locos.
	www.midlandrailwaycentre.co.uk /73129/page4.html (589 words)

	The British Caprotti Valve Gear
		Steam does its work through expansion in the cylinders of the locomotive and when exhausted has greater volume than when admitted, yet the design of the universally accepted piston valve (and similar systems) meant that steam had to be both admitted and exhausted through valve ports of the same size.
		Instead of a simple single seat poppet valve, where petrol/air vapour or exhaust gases passes by the sides, he invented a hollow (spoked) double seat valve, where steam not only passed by the two seats but also went down or up through the centre of the valve as well.
		Instead of a camshaft, with fixed cams on it (to operate the valves), which gave fixed valve events, he invented an assembly with two inlet cams, which could be moved (mechanically) in relation to each other, giving variable inlet valve actuation and one exhaust cam, giving fixed valve events.
	www.dukeofgloucester.cwc.net /caprotti.htm (648 words)

	Poppet Valve product information on FindGuru, formerly ReedLink (Site not responding. Last check: 2007-10-30)
		Two-way stainless poppet valve is available in Â¾â to 1â normally-closed configurations and is ideal for air, oil, water or vacuum pressure applications with highly corrosive or ultra-pure liquid systems.
		A pressure control valve is a hydraulic component used to control or limit the pressure in fluid co...
		The British Caprotti valve gear (an improvement of the Italian one), the German Lentz rotary-cam va...
	www.findguru.com /SingleArticle~ContentId~56170~pub~CE.html (165 words)

	Train Glossary
		A valve gear in which the movement of the inside valve of a three-cylinder steam locomotive is derived via a system of levers from the two outside valve-gears.
		Valve gear with four piston valves per cylinder operated by rotary cams.
		Usually quoted as a percentage, this is the point in a piston stroke at which the supply of steam to the cylinder is cut off by the closing of the valves.
	www.glue-it.com /trains/general-information/glossary/c_summ.htm (1697 words)

	Britain - Midland Railway Center (BR 5MT with Caprotti poppet valve)
		Valve timing control with British Caprotti poppet valves depends on the cam profile of rotary cams, driven by rotation of driving wheels through a shaft and bevel gearbox.
		The motion of cams is transfered to the valves through rollers and rocking levers, and cutoff is adjusted by phase shift of the cams.
		Two valves, one for admission and the other for exhaust, are fitted at each end of the cylinders, so in total eight valves are fitted for one two-cylinder engine.
	www.h3.dion.ne.jp /~rsfe/uk_MRC_e.html (543 words)

	Paxman History Pages - Lentz Valves for Locomotives
		It is not known whether the problems lay with the operation of the Lentz valves themselves or the Paxman patent valve gear, or a combination of the two.
		Their poppet valves were housed in individual valve boxes attached by bolts to the top of each cylinder.
		He added later that "Opinions differ as to the comparative advantages of the horizontal Lentz valve and the vertical Caprotti valve : the former is easily accessible but the latter has the advantage that its weight is not carried by the spindle and this may have some effect on the even seating of the valve".
	www.nelmes.fsnet.co.uk /paxman/lentzloco.htm (6117 words)

	The Robinson Class B3 (GCR Class 9P) "Lord Faringdon" 4-6-0s
		The main difference with the locomotives with the Caprotti valve gear, was that the poppet valves were mounted vertically.
		The valves were then operated by a cam system operated from the main drive axle.
		Caprotti valve gear had the advantage that the periods of of release and compression could be kept constant for any degree of cut-off.
	www.lner.info /locos/B/b3.shtml (954 words)

	Butterfly Gear Valve Worm (Site not responding. Last check: 2007-10-30)
		Worm gears are special gears that resemble screws, butterfly gear valve worm and can be used to drive other gears.
		Worm gear - A worm gear, or worm wheel, is a type of gear that engages with a worm to greatly reduce rotational speed, or to allow higher torque to be transmitted.
		Baker valve gear - Baker valve gear was the main competitor to Walschaert valve gear for steam locomotives in the United States.
	tabletennis.usamsoc.com /butterflygearvalveworm.html (453 words)

	It's A Joy
		On steam locos, the valve gear directs steam into the front or back of the cylinder to move the piston, thus driving the wheels around.
		His valve gear was first fitted to a 2-2-2 in 1848 and subsequently was used all round the world.
		Caprotti valve gear was invented in 1921 by Arturo Caprotti, and was a type of valve gear known as 'poppet'.
	www.mixedtraffic.net /downloads/itsajoy.htm (1502 words)

	A Concise History of The Locomotive
		In 1911 at Milan University, Arturo (Arthur) Caprotti set out to change some of the inherent inefficiencies of the steam railway engine, specifically the way in which steam was admitted to, and from, the cylinders.
		Nevertheless, the British Caprotti poppet valve gear was considered to be of scientific importance.
		The technology, skills and knowledge necessary to manufacture the two missing outside cylinders and their unique valve gear were thought to have disappeared, the cost of restoring the locomotive as a whole was considered prohibitive and why restore a "failure" anyway.
	www.dukeofgloucester.cwc.net /concise.htm (973 words)

	Santa Fe Steam Power
		B&O also had newly built 4-6-2 No. 5320, President Cleveland, equipped with the Caprotti valves in 1928; however, the valve gear was removed in 1929, before 3764 was delivered to the Santa Fe.
		Possibly winter weather conditions adversely affected 3764, but the Caprotti gear simply was too light for the heavy service required on big locomotives such as 3764, and it had the further disadvantage of requiring specialized maintenance, which was never easily achieved at most enginehouses.
		The Santa Fe patent Batz engine truck with coil springs was applied, and the valve travel was shortened to permit operation at a maximum of 90 mph instead of 65 mph, to which the 3751's had been restricted since delivery.
	www.wheelsmuseum.org /stagner1.html (1042 words)

	Industrial Valve - Information
		valve sound poppet A poppet is the of system used The is usually the stem out the and open eliminating float at the stem and the stems may the lift and the is opened.
		A number poppet system were Caprotti gear, Caprotti valve gear an cam gear, cam gear oscillating cam gear and cam gear rotary cam gear.
		See mitral is a heart valve valve in the mitral and the tricuspid are known mitral allows blood mitral is made two leaflets the the known as mitral annulus.
	www.freewebs.com /information24/industrial-valve.html (308 words)

	The Advanced Passenger Locomotive -- A New Machine For The 21st Century
		-The use of caprotti valve gear is intended to ease overhaul.
		Also, by using a shaft to derive the motion, the valve gear will excert no hammerblow on the track.
		In that case, Walscherts valve gear would possibly be used.
	www.freewebs.com /thefutureofsteam/whyvalvegear.htm (1845 words)

	Valve Stean Control » Down Setam Valve Download - Pressure Valve
		- The HF Silicone Stean Valve is a new innovation from Amesil in the Ame : The HF Silicone Setam Valve is a new innovation from Amesil in the Ame-Collect line of single-use bioprocess assemblies, The HF Silicone Stean Valve is a single-use, silicone flow control valve Down Valve free.
		- The HF Silicone Stean Valve is a new innovation from Amesil in the Ame : The HF Silicone Setam Valve is a new innovation from Amesil in the Ame-Collect line of single-use bioprocess assemblies, The HF Silicone Stean Valve is a single-use, silicone flow control valve Download Valve Stean pressure.
		Examples of piston valves are:Piston valves were used by James Watt in his stationary steam engines, and in many of the engines that followed.
	www.newsattv.net /science/steam-valve.htm (936 words)

	Bowen Cooke, Whale & Beames
		He was attracted by the Caprotti valve gear, and at his instigation this gear was fitted to ten LNWR Claughton 4-6-0s; he also instigated the fitting of larger boilers to 20 of this class.
		Claughton 5908 was thus equipped resulting in a triumphant 20% coal saving on test compared to the original design, and Beames was converted to the merits of this kind of valve gear and upheld it staunchly for the rest of his time.
		Although further essays were made with poppet valve gears from time to time they never succeeded in demonstrating any commanding superiority.
	www.steamindex.com /people/bowcook.htm (4023 words)

	NYMR Steam Locomotives
		However, the LH slide valve, which is excessively worn, has been removed for examination as a precursor to an assessment of the extent and likely cost of the major overhaul of the locomotive.
		In the meantime, the three pipe runs from the sight feed lubricator to the valves and pistons are to be renewed in order to ensure the oil feed; the existing pipes, and the restrictors, are thought to be partially blocked by a build up of carbon.
		Mechanically, all the piston and valve work is complete, the slide bars are being optically aligned, the crossheads have been remetalled and the side rods refitted.
	www.nymr.demon.co.uk /steam/steam_1.htm (8505 words)

	Radial Valve Gear
		The radial gear derives its motion from the driving wheel itself thus all calculations have to based on the fact that the radius of rotation of the flycrank provides the base dimension for all calculations (hence RADIAL).
		Joy made a very succesful business deal with the LNWR to have his valve gear used by their locos -as each loco proclaimed with its little plate.
		In the Joy system the valve rod moves in opposition to the push rod from the cylinder which is the more "modern" practice.
	homepage.ntlworld.com /sheila.capella/cabbage/valvegear.html (814 words)

	BR Standard 5MT
		In brief, the latter, designed by Italian engineer Arturo Caprotti, was fitted to a number of locomotive classes over the years under the impression that it was more efficient than existing systems.
		Subsequently, the Caprotti system transpired to be an expensive and difficult arrangement to maintain, eventually causing a reduction in efficiency compared with its Walschaerts counterpart.
		The valve gear was not the only variation within the batches, however - there was also the issue of tenders.
	www.kentrail.co.uk /br_standard_5mt.htm (890 words)

	valve gear
		Adjustment of the Walschaert valve gear with diagram of the components and their names.
		… The valve gear fitted was direct inside Stevensons with the valve chest between the cylinders and the valves back to back.
		Series 4 gear operators are quarter-turn, stainless steel units for manual control of valve positions.
	www.bongobeachgear.com /valve-gear.html (361 words)

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