TAILIEUCHUNG - An Encyclopedia of the History of Technology part 31

An Encyclopedia of the History of Technology part 31. This one of a kind encyclopedia presents the entire field of technology from rudimentary agricultural tools to communication satellites in this first of its kind reference source. Following an introduction that discusses basic tools, devices, and mechanisms, the chapters are grouped into five parts that provide detailed information on materials, power and engineering, transportation, communication and calculation, and technology and society, revealing how different technologies have together evolved to produce enormous changes in the course of history | PART TWO POWER AND ENGINEERING Figure Corliss and drop valves. a Schematic arrangement of Corliss valves. The valve is a machined cylinder oscillating about an axis lying at right angles to the piston stroke. The upper valves are the steam and the lower valves the exhaust valves. The valves are loose on the valve spindle so they are free to find their seats under the action of the steam pressure and free to lift off their seats to allow trapped water to escape. Reproduced with permission from and The Industrial Archaeology of the Stationary Steam Engine Allen Lane London 1976 . b Trip gear that controls the cut-off of the Corliss valve. The valve is opened by means of the oscillating link driven by the eccentric. When the connection at the points A and B is broken the valve closes under the action of the powerful spring. The moment of closure depends on the height h of the lever. As the engine speed increases h increases and the valve closes earlier. Closure of the valve is assisted by atmospheric pressure acting on the exposed side of the dashpot piston and the vacuum formed on the other side when the valve is opened. The exhaust valves are not provided with trip gear and the angular motion in one direction is an exact repetition of the motion in the other direction. 282 STEAM AND INTERNAL COMBUSTION ENGINES Reproduced with permission from The Theory and Practice of Heat Engines Cambridge University Press Cambridge 1951 . c Schematic arrangement of equilibrium drop valves. The valves are mushroom shaped and seat as shown. Motion is in the vertical direction. Note that identical valves are mounted on the same stem so the pressures on the valve faces oppose one another and a balanced arrangement is obtained. Consequently the valve operating force is only required to overcome friction and inertia. Because there are no sliding parts cf. Corliss valve the valve is well adapted to use with superheated steam. Reproduced with .

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