DescriptionBattersea 55 inch Cornish engine valve gear with annotations.png
English: Valve gear for the 55 inch Cornish Engine at Battersea waterworks made by Harvey and CO. of Hayle. Some parts are labelled, but for clarity not all versions of all parts have been indicated. The assembly is shown with all the valves set in their closed position. The blue arrows show the direction they would turn to open. SA: Steam Arbor, QA: Equilibrium Arbor, XA: Exhaust Arbor, H: Handles, LQ: Locking Quadrants, PR: Plug Rod, T:Tappets, W: Attachment points for weights. Based upon “Valve gear, 55-inch Cornish engine, Battersea Waterworks”, The Engineer, Feb 22 1867, page 154.
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