Close up View of Double Sliding Valve Gears from Steam Engine

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“The main valve controls admission, release, and compression; the other (valve) regulates the cut—off only, which may be changed without in any way affecting the other events of the stroke. This cut—off valve may be placed in a separate valve chest, or it may be placed in the back of the main valve.” —Derr, 1911


Derr, Louis Cyclopedia of Engineering (Chicago, IL: American Technical Society, 1911)


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