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2. Steeple compound engine - Wikipedia

   en.wikipedia.org/wiki/Steeple_compound_engine

   Three cylinder engines also had an intermediate-pressure or IP cylinder, but these were less common than two cylinder engines. [i] In the tandem compound the cylinders are arranged end to end on a common axis (in this case, vertical) with both pistons mounted on the same rod and moving together. Each cylinder has independent valves and valve gear.

3. Uniflow steam engine - Wikipedia

   en.wikipedia.org/wiki/Uniflow_steam_engine

   The poppet valves are controlled by the rotating camshaft at the top. High pressure steam enters, red, and exhausts, yellow. The uniflow type of steam engine uses steam that flows in one direction only in each half of the cylinder. Thermal efficiency is increased by having a temperature gradient along the cylinder. Steam always enters at the ...

4. Cylinder (locomotive) - Wikipedia

   en.wikipedia.org/wiki/Cylinder_(locomotive)

   The cylinder is made pressure-tight with end covers and a piston; a valve distributes the steam to the ends of the cylinder. Cylinders were initially cast iron, but later made of steel. The cylinder casting includes other features such as (in the case of Stephenson's Rocket) valve ports and mounting feet. [1]

5. Poppet valve - Wikipedia

   en.wikipedia.org/wiki/Poppet_valve

   The word poppet shares etymology with "puppet": it is from the Middle English popet ("youth" or "doll"), from Middle French poupette, which is a diminutive of poupée.The use of the word poppet to describe a valve comes from the same word applied to marionettes, which, like the poppet valve, move bodily in response to remote motion transmitted linearly.

6. Valve timing - Wikipedia

   en.wikipedia.org/wiki/Valve_timing

   With traditional fixed valve timing, an engine will have a period of "valve overlap" at the end of the exhaust stroke, when both the intake and exhaust valves are open. The intake valve is opened before the exhaust gases have completely left the cylinder, and their considerable velocity assists in drawing in the fresh charge. Engine designers ...

7. Piston valve (steam engine) - Wikipedia

   en.wikipedia.org/wiki/Piston_valve_(steam_engine)

   In the case of the steam port this allows admission of steam to fill the clearance space between the cylinder and piston and ensures maximum cylinder pressure before the commencement of the stroke. [3] This both cushions and assists the mass of the piston to slow down and change direction. At slow speeds no lead is ideal.

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9. Cylinder (engine) - Wikipedia

   en.wikipedia.org/wiki/Cylinder_(engine)

   During use, the cylinder liner is subject to wear from the rubbing action of the piston rings and piston skirt. This wear is minimized by the thin oil film which coats the cylinder walls and also by a layer of glaze which naturally forms as the engine is run-in. On some engines, the cylinder liner is replaceable, in case it becomes worn or damaged.