Table.
| No. | 1 | 2 | 3 | 4 | 5 |
| Size of Plunger in inches | 21⁄4 | 3 | 41⁄2 | 6 | 8 |
| Length of Stroke in Inches | 23⁄4 | 31⁄4 | 43⁄4 | 61⁄2 | 81⁄2 |
| Gallons per Stroke or 1 Rev. | .28 | .58 | 1.96 | 4·76 | 11.08 |
| Revolutions per Minute | 20 to 50 | 10 to 40 | 10 to 40 | 10 to 30 | 10 to 25 |
| Size of Suction in Inches | 11⁄4 | 11⁄2 | 21⁄2 | 4 | 5 |
| Size of Discharge in Inches | 11⁄4 | 11⁄2 | 2 | 31⁄2 | 4 |
| Size of Pulleys | ACCORDING TO DUTY REQUIRED | ||||
| Geared | { *16 } { 72# } | { *16 } { 80# } | { *13 } { 71# } | { *20 } { 89# } | { *20 } { 80# } |
| Pressure Pounds | 175 | 175 | 170 | 165 | 160 |
* Teeth in Pinion.# Teeth in Spur Gear.
The description of the duplex power pump just given, applies to this type also. The exception is that the triplex has three plungers and barrels instead of two. There are two spur wheels and two pinions on each pump to equalize the power to better advantage, as by this arrangement one eccentric is placed between each pair of spur wheels and two eccentrics outside. The pinion shaft is in one piece having tight and loose pulleys.
Fig. 212.
The eccentrics—six in number—are set at 60°, and an even strain on the belt at all points of the stroke is thus obtained, and connecting both discharges together insures a steady flow without shock. Where light duty only is required, these pumps are made without gears to run with the belt over pulleys.
Fig. 212 represents a single acting triplex plunger pump actuated by a belt over a tight and loose pulley.