Cross Sectional View of the High Pressure Cylinder of Piston Valve from USS Massachusetts

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“This valve consists of two pistons connected by a sleeve through which the valve rod passes. This valve rod is prolonged to a small balancing piston, placed directly over the main valve.” —Derr, 1911

Source

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

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