. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. FARM SANITATION 489 lined cylinders are used where the water contains elements that corrode iron and brass. Plungers are constructed to suit the lift under which they are to work. If the lift has but a few feet, one plunger leather which expands out toward the cylinder walls, making a water-tight fit, will be sufficient; but if the well is deep or the water is to be lifted against pressure, as many as four
. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. FARM SANITATION 489 lined cylinders are used where the water contains elements that corrode iron and brass. Plungers are constructed to suit the lift under which they are to work. If the lift has but a few feet, one plunger leather which expands out toward the cylinder walls, making a water-tight fit, will be sufficient; but if the well is deep or the water is to be lifted against pressure, as many as four leathers will be found Fig. 303. Some common types of pump cylinders. 1 is of plain cast iron, 2 is galvanized, 3 is porcelain lined, 4 and 5 are brass lined, and 6 is an all-brass cylinder. The valves are another important part of a pump. They should be designed to resist wear and to require the minimum of attention. There are at least four types of valves used in farm pumps. The hinge valve, made with a metal weight on a leather disk and attached at one side, is used where the lift is not great. It is a simple valve and the cheapest, but is not well suited for high pressures. Poppet valves are those which lift directly from the seat, and are made with one or three prongs to guide the valve to its seat. These valves are the easiest to repair. Ball valves are used. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Davidson, Jay Brownlee, 1880-1957. St. Paul, Minn. , Webb Pub. Co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1919
