• Piston valves are one form of valve used to control the flow of steam within a steam engine or locomotive.
• They control the admission of steam into the cylinders and its subsequent exhausting, enabling a locomotive to move under its own power.
• Piston valves are one form of valve used to control the flow of steam within a steam engine or locomotive.
• They control the admission of steam into the cylinders and its subsequent exhausting, enabling a locomotive to move under its own power.