Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 591
Scale.—i inch=l foot. Scale.—1 inch=l foot. Valves.—The function of a valve is to open or close a passage, and all the varieties arc divisible int..the genera of lifting and sliding valves. Sliding-valves are generally employed to admit the steamalternately above and below the pistons of engines,… … lifting or spindle valves are usually employed. Safety-valves arealways spindle-valves, though a slide-valve, opened by the rise of acolumn of water or mercury, has been proposed as a safety-valve.The valves of pumps are generally spindle, flap, or ball valves, butare slide-valves sometimes. A cock…
Mechanical engineering · Mechanics · Engineering
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