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2. Piston valve (steam engine) - Wikipedia

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

   In the 20th century, slide valves were gradually superseded by piston valves, particularly in engines using superheated steam. There were two reasons for this: It is difficult to lubricate slide valves adequately in the presence of superheated steam; With piston valves, the steam passages can be made shorter.

3. Expansion valve (steam engine) - Wikipedia

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

   [i] As less steam is supplied in the shorter time for which the valve is open, use of the expansion valve reduces the steam consumed and thus the fuel required. [2] The engine (on 1875 figures) may deliver two-thirds of the work, for only one-third of the steam. [2] Indicator diagram showing steam pressure with piston movement

4. Steam (service) - Wikipedia

   en.wikipedia.org/wiki/Steam_(service)

   The Steam interface allows for user-defined shortcuts to be added. In this way, third-party modifications and games not purchased through the Steam Store can use Steam features. Valve sponsors and distributes some modifications free of charge; [132] and modifications that use Steamworks can

5. List of Valve games - Wikipedia

   en.wikipedia.org/wiki/List_of_Valve_games

   The reception of their games, along with the creation of Steam, has prompted some publications to list Valve as one of the top game developers of all time and the most powerful company in PC gaming. [ 15 ] [ 16 ] [ 17 ] Newell received a BAFTA Fellowship award in 2013 for recognizing the impact Valve had left on the gaming industry in producing ...

6. Source (game engine) - Wikipedia

   en.wikipedia.org/wiki/Source_(game_engine)

   There, Valve stated that it would be free to use for developers, with support for the Vulkan graphical API, as well as using a new in-house physics engine called Rubikon. [24] [25] In June 2015, Valve announced that Dota 2, originally made in the Source engine, would be ported over to Source 2 in an update called Dota 2 Reborn.

7. Slide valve - Wikipedia

   en.wikipedia.org/wiki/Slide_valve

   Cylinder, with slide valve removed to show ports A double-acting slide valve cylinder. Steam enters via the steam port SP, and is admitted by the slide valve SV through the upper passage S to push down the piston P. At the same time, exhaust steam from below the piston passes back up the lower passage S, via the valve cavity, to exhaust E. As ...