Plun′ger-pump.
One having a solid piston (
plunger) which acts by displacement of the water in the barrel, in contradistinction to a bucket-pump which has a hollow piston (
bucket) through which the water passes during the down stroke, to be lifted when the bucket rises.
A is one form of plunger-pump adapted for mines.
The delivery-valve
b is placed on top of the suction-valve
c, which has a branch to the barrel
e of the pump.
The plunger-pole
a is cased with a cast-iron pipe turned true and draw-filed, and works through a stuffing-box on top of the barrel.
B is a jack-head lift-pump introduced for the purpose of illustrating the distinction between
lift and
plunger pumps.
It is also a form of mining-pump.
The working-bucket is packed with leather, which is secured to the body of the bucket by a brass ring.
The suctioncham-ber
a is bolted directly to the lower end of the working-barrel
b, and has a suction pipe
c and windbore bolted to its lower flange.
The
goosenecked (in which consists the peculiarity of the jack-head) is bolted to the top of the barrel, and has a bonnet and stuffing-box
e through which the bucket-rod passes.
The upper clack sits on the branch of the
gooseneck, with the column bolted on its upper flange.
The clack-chambers have doors through which the clacks are removed for repairs.
A door is sometimes made in the gooseneck, through which the working bucket may be taken out without taking off the bonnet
[
1752]
from the top. Jack-head pumps are best adapted for lifting water from a cistern or a permanent
sump, although they are very commonly used in sinking.
See mining-pump; lift-pump; force-pump, etc. See also list under pump.
C shows a pump with a loaded plunger.
 |
|
Mining-pumps. |
D shows a piston fitting in the top of a pump-cylinder.
The gland is screwed down upon the packing, which consists of two leather rings and one of metal.
E F are two plunger-pistons; one is represented as cast cylindrical, having a cap-plate screwed on to the bottom part.
Another is made up of circular disks
a clamping rings of leather
b.
G is a portion of a plunger-pole, showing the coupling of sections.
