===========+========+========+========+========+========
No. | 1 | 2 | 3 | 4 | 5
-----------+--------+--------+--------+--------+--------
Size of | | | | |
Plunger | 2-1/4 | 3 | 4-1/2 | 6 | 8
in inches | | | | |
-----------+--------+--------+--------+--------+--------
Length of | | | | |
Stroke | 2-3/4 | 3-1/4 | 4-3/4 | 6-1/2 | 8-1/2
in Inches | | | | |
-----------+--------+--------+--------+--------+--------
Gallons | | | | |
per Stroke | .28 | .58 | 1.96 | 4·76 | 11.08
or 1 Rev. | | | | |
-----------+--------+--------+--------+--------+--------
Revolutions| | | | |
per |20 to 50|10 to 40|10 to 40|10 to 30|10 to 25
Minute | | | | |
-----------+--------+--------+--------+--------+--------
Size of | | | | |
Suction | 1-1/4 | 1-1/2 | 2-1/2 | 4 | 5
in Inches | | | | |
-----------+--------+--------+--------+--------+--------
Size of | | | | |
Discharge | 1-1/4 | 1-1/2 | 2 | 3-1/2 | 4
in Inches | | | | |
-----------+--------+--------+--------+--------+--------
Size of | ACCORDING TO DUTY REQUIRED
Pulleys |
-----------+--------+--------+--------+--------+--------
Geared | { *16 }| { *16 }| { *13 }| { *20 }| { *20 }
| { 72# }| { 80# }| { 71# }| { 89# }| { 80# }
-----------+--------+--------+--------+--------+--------
Pressure | 175 | 175 | 170 | 165 | 160
Pounds | | | | |
-----------+--------+--------+--------+--------+--------
* 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.
[Illustration: 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.
The principal characteristic of this pump is the long connecting rods.
These have at their upper ends regular connecting rod straps with
brasses fitted to them and adjusted by wedges and set screws. At the
plunger or lower ends of these rods bronze bushings and steel pins are
used.
These pumps are largely employed for pumping semi-liquids such as tar,
soap, mud, tan-liquor, oils, chemicals, sewage, etc.
The teeth of the pinion and the meshing part of the two gears are
protected by _a shield_ to prevent clothing being caught or parts of
the body from being injured.
For these various materials different valves are necessary to be used
each suited to the substance to be elevated or conveyed.
The removal of one cover, in this pump, exposes all the discharge
valves and a plate uncovers each of the three groups of suction valves,
as shown. The suction pipe may be attached at either end of the suction
chamber while the discharge pipe may be connected with one or both ends
of the discharge chamber.
The pump here represented has barrels 8-inch in diameter by 10-inch
stroke. The air chamber is very large in proportion to the pump.