Valve with Lap of Steam Engine Where Steam Enters the Slide Valve Compartment

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“The maximum displacement of the valve is attained when the eccentric is horizontal. In this position both the steam and exhaust ports are wide open, and any further motion motion of the piston will cause the valve to move toward its mid position.” —Derr, 1911


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


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