Poppet Valves

Some articles on valve, valves, poppet valve, poppet valves:

4-8-2 - Usage - South Africa
... NBL, these locomotives had plate frames, Walschaerts valve gear and Belpaire fireboxes and were the first of Hendrie’s designs to have superheaters and piston ... heavy mixed traffic locomotive with Stephenson valve gear and that used saturated steam, they were built by NBL ... was an improved version of the predecessor Class 4, with a superheater and Walschaerts valve gear ...
Sleeve Valve - Advantages/disadvantages - Advantages
... The main advantages of the sleeve-valve engine are Increased volumetric efficiency due to very large port openings ... greater proportion of the cycle, which is fairly easy to achieve with sleeve valves, but difficult in a poppet valve system ... scavenging when exhaust/inlet timing overlap is used and a wide speed range required, whereas poor poppet valve exhaust scavenging can dilute the fresh air/fuel mixture intake to a greater degree ...
PRR K4s - Modifications - Other Modifications - Poppet Valves
... K4s 5399 was rebuilt by Lima in 1939, with, among other improvements, poppet valves actuated by Franklin oscillating cams ... K4s 5436 was fitted with stem actuated valves in 1940 ... in 1945, K4s 3847 was given a front-end throttle and Franklin rotary-actuated poppet valves ...
Poppet Valve - Steam Engine
... James Watt was using poppet valves to control the flow of steam into the cylinders of his beam engines in the 1770s ... and Lardner (1840) provides an illustrated description of Watt's use of the poppet valve ... When used in high-pressure applications, for example, as admission valves on steam engines, the same pressure that helps seal poppet valves also contributes significantly ...
Camless
... today employ one or more camshafts to operate poppet valves ... The lobes on the camshafts operate cam followers which in turn open the poppet valves ... A camless (or, free valve engine) uses electromagnetic, hydraulic, or pneumatic actuators to open the poppet valves instead ...