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Use of poppet valves also increased the speed because they gave very accurately-timed steam delivery to the cylinders.
en.wikipedia.org If the engine uses the common form of overhead poppet valves, these would also be difficult to fit inside the limited space.
en.wikipedia.org Sleeve valves were also subjected to less intense heat buildup than poppet valves, owing to their greater area of contact with other metal surfaces.
en.wikipedia.org The engine was a 4 stroke poppet valve engine, and, surprisingly, has overhead valves, instead of side valves and a simple centrifugal governing system.
en.wikipedia.org Poppet valves are employed extensively in the launching of torpedoes from submarines.
en.wikipedia.org