This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ... hand.wheel, marked with arrows indicating the direction in which the wheel should be turned in order to open or close the valve; the compression of the rubber ring on the faced surface of metal makes it perfectly watertight. This valve should be occasionally opened and closed, or the rubber may adhere to the metal and ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ... hand.wheel, marked with arrows indicating the direction in which the wheel should be turned in order to open or close the valve; the compression of the rubber ring on the faced surface of metal makes it perfectly watertight. This valve should be occasionally opened and closed, or the rubber may adhere to the metal and get deranged, in fact, all valves should be periodically examined, and the spindles oiled, &c, to see that they work freely, and that there is no leakage at the packing nuts, &c. The screw-slide valve (Figs. 74 and 75) has no rubber ring, the valve and the seat are made of brass, the surface of each being turned and the faces ground. Instead of hinging on a quadrant, the valve is lifted vertically by means of a double.threaded screw, and when closed is forced by wedge-shaped projections against the valve seat, making a good and reliable joint. This valve (as also Fig. 72) gives a clear passage the full bore of the pipe. For first.class work they are preferable to the ordinary throttle.valve. When used for steam, metal surfaces are best, as rubber is liable to harden from intense heat; on the other hand, metal faces, unless carefully ground, are liable to leakage, and are sometimes affected by grit or dirt getting between the valve and the valve seat. Valves similar in construction are often made with double faces; these are called sluice valves; as they are generally used for cold water mains, and to withstand excessive pressure, they need not be further described here. FIG. 77. dUN-METAL VALVES. For wrought tubes gun.metal valves are most suitable. The ordinary wheel valve (Fig. 76) is too well known to need any description, it is adapted for either hot water or steam; the valve should have wings on, otherwise it is liable to bear on...
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Seller's Description:
Used-Good. Good hardback. Oxblood cloth with gilt; 32pp of advertisements at rear. Hinges cracked & repaired; free end papers a little browned; text generally clean. Spine faded, with dull & worn gilt; & wear at head & foot.
Publisher:
Crosby, Lockwood and Son, 2nd edition 1894
Language:
English
Alibris ID:
14906500842
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Seller's Description:
Hbk 12mo 2nd edition illustr throughout no dj as issued maroon cloth boards with bright gilt titles rubbed at extremities but otherwise bright and clean and now in custom acetate jacket front hinge cracked notation on front endpaper otherwise a very good clean unmarked copy.
