Joy Steam Engine Valve Gear Rotating Wheel Small 320×144 Medium 640×288 Large 1024×460 Download Tiff Original 2400×1079 | (248.2 KB) Description A Joy valve gear for steam engine rotating the wheel in the direction of the arrow. The lever F changes the direction the wheel would turn when turned to point B. Keywords engine, engines, Joy Steam Engine Valve Gear Rotating Wheel, steam engine, Steam Engine Shaft, steam engine valve, Steam Engine Valves, Valve Gear Galleries Machines Parts Source: Derr, Louis Cyclopedia of Engineering (Chicago, IL: American Technical Society, 1911)