Pumps; Historically, Theoretically, and Practically Considered (Paperback)

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. 1895 Excerpt: ...is surrounded. The casing is thus divided into two compartments--one open to the top end of the cylinder, the other to the bottom end. The casing has also cast with it the central portion of the inlet or suction valve-box C; this valve-box is divided horizontally by a partition into two compartments. The upper compartment of the valve-box is divided into two by a vertical partition, and from the compartment on one side of the vertical partition a passage is made opening into the upper part of the casing, whilst from the compartment on the other side of the vertical partition there is a passage to the lower casing; from the lower compartment of the valve-box is led the suction-pipe, and the lower compartment, by two passages fitted with suctionvalves, communicates with the two compartments above it. The manner in which the valve-box is constructed and fitted at its upper end with covers by which the suctionvalve D can be got at for examination and repairs, is clearly shown in the illustration. On the opposite side of the pump the casing has similarly cast with it the outlet or delivery passages fitted with delivery valves F, and these valves are both covered over by one cap, from which are two outlet or delivery passages, to either one or other of which the delivery pipe may be attached, whilst the other is closed by a screw cap. The piston L of the pump is fitted with double-cupped leathers. A vertical double-acting plunger pump, with one plunger only, of a rather peculiar construction, was patented in England in the year 1870, by Messrs. Kichard Potter Pearn and Frank Kelsey Pearn. Fig. 87 is a sectional elevation of a pump of this description; A is the piston-rod, to which is connected the plunger B; this plunger may be moved up and down or to and fro by ...