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. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. HYDEAULICS. 763 means of force pumps of, comparatively speaking, small stroke and diameter of plunger, driven by-gearing and run at a considerable number of strokes a minute. Under these circumstances,unless a great number of pumps are used, the rate of travel of the press ram is extremely slow, not-withstanding that the number of strokes of the pump plungers is comparatively great; and thusfor every single stroke of the press there are often some hundreds of beats of the pump valves on. their seats, and i

. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. HYDEAULICS. 763 means of force pumps of, comparatively speaking, small stroke and diameter of plunger, driven by-gearing and run at a considerable number of strokes a minute. Under these circumstances,unless a great number of pumps are used, the rate of travel of the press ram is extremely slow, not-withstanding that the number of strokes of the pump plungers is comparatively great; and thusfor every single stroke of the press there are often some hundreds of beats of the pump valves on. their seats, and i Stock Photo
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The Reading Room / Alamy Stock Photo

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2AFRRHW

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7.1 MB (315.8 KB Compressed download)

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3279 x 762 px | 27.8 x 6.5 cm | 10.9 x 2.5 inches | 300dpi

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. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. HYDEAULICS. 763 means of force pumps of, comparatively speaking, small stroke and diameter of plunger, driven by-gearing and run at a considerable number of strokes a minute. Under these circumstances,unless a great number of pumps are used, the rate of travel of the press ram is extremely slow, not-withstanding that the number of strokes of the pump plungers is comparatively great; and thusfor every single stroke of the press there are often some hundreds of beats of the pump valves on. their seats, and in consequence a diflQculty in keeping them tight; in some of the best examplestlie number of beats is 1000 to 1200 a bale pressed. With this system there is much loss of usefuleffect from friction of parts; and, while a considerable cost in mamtenance is involved, owing tothe wear and tear of the gearing, only a very slow speed in working the presses is obtained. 14Y5. ::^::o C

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