Piston valve (steam engine)
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Piston valves are one form of valve used to control the flow of steam within a steam engine or locomotive. They control the admission of steam into the cylinders and its subsequent exhausting, enablin
Diagram of cylinder and piston valve. The valve is next opened by moving it to the right, allowing the clear space in the middle of the valve to align with the channel in the cylinder above it.
The Swannington incline winding engine of 1833 incorporated a piston valve
Poppet valve
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In internal combustion engines, a poppet valve is a valve typically used to control the timing and quantity of petrol or vapour flow into or out of an engine, but with many other applications.
Piston valve (steam engine)
…The usual locomotive valve gears such as Stephenson, Walschaerts, and Baker valve gear, can be used with either slide valves or piston valves. Where poppet valves are used, a different gear, such as Caprotti valve gear may be used, though standard gears as mentioned above were used as well, by Chapelon and others…
Overhead camshaft engine
Oscillating poppet valve on one of Chapelon's rebuilt 4-6-2 locomotives
Poppetvalve