Locomotive breakdown questions answered and illustrated (1907)
Wallace, W. G · Chicago, F. J. Drake & Co. · leaf 34
ufficiently open to hold therelief valve shut when drifting, and the use of dry steamand valve oil, will obviate the necessity of using anythingelse in the steam-chests and cylinders. 28. Piston Valve.—What is a piston valve ? Answer.—A piston valve is a valve composed of twopistons connected… … Diagram of Slide-Valve Engine. Showing positions of piston, valve, piston-crank (Oa), and valve-crank (Ob) at eachquarter-turn during one complete revolution of driver. At the start (A), port at left isabout to admit steam, port at right about to be connected with exhaust, and pistonabout to begin…
Locomotives
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