. Canadian forest industries 1897-1899. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. June, 1899 13 again. In this way no attention is necessary to supply the pump with water. Some makers of hydraulic pumps prefer to make one of the plungers larger than the other two and arranged so that when the pressure reaches a certain limit this plunger is automatically cut out, the pump then becoming a duplex. The reason for intro- ducing this feature is to raise the ram faster, thereby saving time and increasing the output of the press. The result is not ve
. Canadian forest industries 1897-1899. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. June, 1899 13 again. In this way no attention is necessary to supply the pump with water. Some makers of hydraulic pumps prefer to make one of the plungers larger than the other two and arranged so that when the pressure reaches a certain limit this plunger is automatically cut out, the pump then becoming a duplex. The reason for intro- ducing this feature is to raise the ram faster, thereby saving time and increasing the output of the press. The result is not very satisfactory, owing to various reasons. When the 3 plungers are working, they are acting 1200 apart, giving an even strain on the gearing and belt. Now when one is cut out, the pump is simply a badly-. Fig. 14—High Pressure Triplex Pump. (Made by I. Matheson & Co.) designed duplex, as the cranks of the remaining two plungers are not opposite each other. This causes uneven wear on the gear, and a periodic swing in the belt. If it is desirable to increase the output of the press by a special design in the pump, it would be better to have three ot the plungers the same size and introduce a fourth one of larger diameter than the rest. As the three similar ones do the greater part of the work, they should be spaced 1200 apart, as in an ordinary triplex, and the extra and larger one midway between any two of them. The strain on the gear and belt will not be even at first, when the load is light, but occurs when the pressure is heavy, when the pump is working properly as a triplex. There may be objections to this, but when it is remem-. 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 Don Mills, Ont. : Southam Business Publications
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectforestsandforestry
