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Piston Valve (steam Engine)
Piston valves are one form of valve used to control the flow of steam within a steam engine or steam locomotive, locomotive. They control the admission of steam into the cylinders and its subsequent exhausting, enabling a locomotive to move under its own power. The valve consists of two piston heads on a common spindle moving inside a steam chest, which is essentially a mini-cylinder located either above or below the main cylinders of the locomotive. Overview In the 19th century, steam locomotives used slide valves to control the flow of steam into and out of the Cylinder (steam locomotive), cylinders. In the 20th century, slide valves were gradually superseded by piston valves, particularly in engines using Superheater, superheated steam. There were two reasons for this: * It is difficult to Lubrication, lubricate slide valves adequately in the presence of Superheater, superheated steam * With piston valves, the steam passages can be made shorter. This, particularly following t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cylinder And Piston Valve (New Catechism Of The Steam Engine, 1904)
A cylinder () has traditionally been a Solid geometry, three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a Prism (geometry), prism with a circle as its base. A cylinder may also be defined as an infinite set, infinite curvilinear surface (mathematics), surface in various modern branches of geometry and topology. The shift in the basic meaning—solid versus surface (as in a solid ball (mathematics), ball versus sphere surface)—has created some ambiguity with terminology. The two concepts may be distinguished by referring to solid cylinders and cylindrical surfaces. In the literature the unadorned term "cylinder" could refer to either of these or to an even more specialized object, the ''right circular cylinder''. Types The definitions and results in this section are taken from the 1913 text ''Plane and Solid Geometry'' by George A. Wentworth and David Eugene Smith . A ' is a Surface (mathematics), surface ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leicester And Swannington Railway
The Leicester and Swannington Railway (L&SR) was one of England's first railways, built to bring coal from West Leicestershire collieries to Leicester, where there was great industrial demand for coal. The line opened in 1832, and included a tunnel over a mile in length, and two rope-worked inclined planes; elsewhere it was locomotive-operated, and it carried passengers. When it was built, the was the only railway in the area, but the Midland Railway (MR) was formed and had a main line through Leicester, opened in 1840By the Midland Counties Railway. and its directors decided to acquire the . They made a generous offer and they took possession in 1847. At first the Midland Railway line and the were not connected, but the Midland Railway constructed a route from its main line to Burton, using part of the . The by-passed the inclines for its new route, but most of the other parts of the continued in use until 1966. The Burton line continues in use at the present day. Prior hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slide Valve
The slide valve is a rectilinear valve used to control the admission of steam into and emission of exhaust from the cylinder of a steam engine. Use In the 19th century, most steam locomotives used slide valves to control the flow of steam into and out of the cylinders. In the 20th century, slide valves were gradually superseded by piston valves, particularly in engines using superheated steam. There were two reasons for this: * With piston valves, the steam passages can be made shorter. This reduces resistance to the flow of steam and improves efficiency. * It is difficult to lubricate slide valves adequately in the presence of superheated steam. Murdoch's D slide valve The D slide valve, or more specifically Long D slide valve, is a form of slide valve, invented by William Murdoch and patented in 1799. It is named after the hollow central D-sectioned piston. This valve worked by "connecting the upper and lower valves so as to be worked by one rod or spindle, and in mak ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennsylvania Railroad Class I1s
The Pennsylvania Railroad (PRR) class I1s steam locomotives were the largest class of 2-10-0 "Decapods" in the United States. From 1916 to 1923, 598 locomotives were produced (123 at the railroad’s Altoona Works and 475 at Baldwin Locomotive Works). They were the dominant freight locomotive on the system until World War II and remained in service until 1957. Nicknames for the type included ''Decs'' and ''Hippos'', the latter due to their large boiler. The I1s design was much larger than the 2-10-0 design that preceded it, taking advantage of the PRR's heavy trackage and high allowed axle load, with a wide, free-steaming boiler. Large cylinders enabled the I1s to apply that power to the rails. However, the large boiler limited the size of the driving wheels, which made it impossible to mount counterweights large enough to balance the piston thrusts. As a result, they were hard riding at anything but low speeds, prone to slipping, and unpopular with crews. The locomotives were know ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pennsylvania Railroad
The Pennsylvania Railroad ( reporting mark PRR), legal name as the Pennsylvania Railroad Company, also known as the "Pennsy," was an American Class I railroad that was established in 1846 and headquartered in Philadelphia, Pennsylvania. At its peak in 1882, the Pennsylvania Railroad was the largest railroad (by traffic and revenue), the largest transportation enterprise, and the largest corporation in the world. Over its existence, Pennsylvania Railroad acquired, merged with, or owned part of at least 800 other rail lines and companies. At the end of 1926, it operated of rail line;This mileage includes companies independently operated. PRR miles of all tracks, which includes first (or main), second, third, fourth, and sidings, totalled 28,040.49 at the end of 1926. in the 1920s, it carried nearly three times the traffic as other railroads of comparable length, such as the Union Pacific and Atchison, Topeka & Santa Fe railroads. Its only formidable rival was the New York Centra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Franz Reuleaux
Franz Reuleaux (; ; 30 September 1829 – 20 August 1905) was a German mechanical engineer and a lecturer at ''Technische Hochschule Berlin'' (today Technische Universität Berlin), later appointed as the president of the academy. He was often called the father of kinematics. He was a leader in his profession, contributing to many important domains of science and knowledge. Today, he may be best remembered for the Reuleaux triangle, a curve of constant width that he helped develop as a useful mechanical form. Biography Early life Reuleaux was born in Eschweiler in Germany (at the time part of Prussia). His father and grandfather were both mechanical engineers. His technical training was at the Karlsruhe Polytechnic School. He then studied at universities in Berlin and Bonn. Middle years After a time spent in the family business he became a professor at the Swiss Federal Institute in Zürich. Eventually, in 1879 he became Rector at the Königs Technischen Hochschule Berlin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gustav Zeuner
Gustav Anton Zeuner (30 November 1828 – 17 October 1907) was a German physicist, engineer and epistemologist, considered the founder of technical thermodynamics and of the Dresden School of Thermodynamics. Life University and Revolution Zeuner was born in Chemnitz, Saxony. His first training in the subject of engineering was at the Chemnitz ''Königliche Gewerbeschule'' (Royal Vocational School), today Chemnitz University of Technology, where he studied from 1843-1848. In 1848 he moved the short distance to the ''Bergakademie'' (Mining Academy) in Freiberg, today also a university of technology, where he studied mining and metallurgy. He developed close links with one of his professors, the famous mineralogist Albin Julius Weisbach, with whom he worked on several projects. The university course was disrupted, however, during the revolutions which took place all over Germany. Large popular assemblies and mass demonstrations took place, primarily demanding freedom of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shunter
A switcher locomotive (American English), shunter locomotive (British English), station pilot (British English), or shifter locomotive ( Pennsylvania Railroad terminology) is a locomotive used for maneuvering railway vehicles over short distances. Switchers do not usually move trains over long distances. Instead, they typically assemble trains in order for another locomotive to take over. Switchers often operate in a railyard or make short transfer runs. They may serve as the primary motive power on short branch lines or switching and terminal railroads. A hybrid type known as a road switcher can both shunt and haul trains. Switchers are optimized for their role, being relatively low-powered but with a high starting tractive effort for getting heavy cars rolling quickly. Switchers are geared to produce high torque but are restricted to low top speeds and have small diameter driving wheels. Switchers tend to be durable and to remain in service for a long time, such as the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Exhaust System
An exhaust system is used to guide reaction exhaust gases away from a controlled combustion inside an engine or stove. The entire system conveys burnt gases from the engine and includes one or more exhaust pipes. Depending on the overall system design, the exhaust gas may flow through one or more of the following: * Cylinder head and exhaust manifold *A turbocharger to increase engine power. *A catalytic converter to reduce air pollution. *A muffler (North America) / silencer (UK/India), to reduce noise. Design criteria An exhaust pipe must be carefully designed to carry toxic and noxious gases away from the users of the machine. Indoor generators and furnaces can quickly fill an enclosed space with poisonous exhaust gases such as hydrocarbons, carbon monoxide and nitrogen oxides, if they are not properly vented to the outdoors. Also, the gases from most machines are scorching; the pipe must be heat-resistant and not pass through or near anything that can burn or be da ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Live Steam
Live steam is steam under pressure, obtained by heating water in a boiler. The steam may be used to operate stationary or moving equipment. A live steam machine or device is one powered by steam, but the term is usually reserved for those that are replicas, scale models, toys, or otherwise used for heritage, museum, entertainment, or recreational purposes, to distinguish them from similar devices powered by electricity, internal combustion, or some other more convenient method but designed to look as if they are steam-powered. Revenue-earning steam-powered machines such as mainline and narrow gauge steam locomotives, full-sized steamships, and the worldwide electric power-generating industry steam turbines are not normally referred to as "live steam". Steamrollers and traction engines are popular, in 1:4 or 1:3 scale, as are model stationary steam engines, ranging from pocket-size to 1:2 scale. Railroads or railways Ridable, large-scale live steam railroading on a ba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cylinder (engine)
In an engine, the cylinder is the space in which a piston travels. The inner surface of the cylinder is formed from either a thin metallic liner (also called "sleeve") or a surface coating applied to the engine block. A piston is seated inside each cylinder by several metal piston rings, which also provide seals for compression and the lubricating oil. The piston rings do not actually touch the cylinder walls, instead they ride on a thin layer of lubricating oil. Steam engines The cylinder in a steam engine is made pressure-tight with end covers and a piston; a valve distributes the steam to the ends of the cylinder. Cylinders were cast in cast iron and later in steel. The cylinder casting can include other features such as valve ports and mounting feet. Internal combustion engines The cylinder is the space through which the piston travels, propelled by the energy generated from the combustion of the air/fuel mixture in the combustion chamber. In an air-cooled e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steam Engine Lap And Lead Diagram
Steam is water vapor, often mixed with air or an aerosol of liquid water droplets. This may occur due to evaporation or due to boiling, where heat is applied until water reaches the enthalpy of vaporization. Saturated or superheated steam is invisible; however, wet steam, a visible mist or aerosol of water droplets, is often referred to as "steam". When liquid water becomes steam, it increases in volume by 1,700 times at standard temperature and pressure; this change in volume can be converted into mechanical work by steam engines such as reciprocating piston type engines and steam turbines, which are a sub-group of steam engines. Piston type steam engines played a central role in the Industrial Revolution and modern steam turbines are used to generate more than 80% of the world's electricity. If liquid water comes in contact with a very hot surface or depressurizes quickly below its vapour pressure, it can create a steam explosion. Types of steam and conversions Steam is trad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
