Centrifugal
pumps are often thought of as the simplest and most widely
used of all the various pump types. A centrifugal pump has
a rotating impeller, within a casing, which imparts radial
velocity to the liquid, which then exits the pump by way
of the discharge nozzle.
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Vertical
Centrifugal Pumps
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Vertical
Centrifugal Pumps are designed and meant to be used as
a vertically mounted assembly. Typical vertical pumps
include or have as an option some sort of mounting plate.
Others are meant to be completely submersed in the liquid.
They have bearings or bushings, usually a non-metallic
type, somewhere along the shaft to minimize shaft run-out
and whip. This category also includes those pumps, which
are hermetically sealed pump and motor units, suitable
for being completely submersed in the liquid. Unlike horizontals,
vertical pumps rarely need to be primed, the impeller
and casing simply need to be submerged during start-up.
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Centrifugal Pumps |
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Horizontal
Centrifugal Pumps are designed and meant to be used as
a horizontally mounted assembly. This includes feet on
the pump, motor or both for securing the pump and motor
to its floor or structure. The most common type of Horizontal
pump is the End Suction, where the fluid enters the front
end of the casing and exits perpendicularly. The source
of liquid is either above the pump, in which case it is
a positive head and no special priming is needed. If the
liquid source is below the pump then either a priming
chamber is needed or use of some sort of suction side
valve, i.e. foot valve, to maintain prime in an open pumping
system.
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Displacements
pumps are often thought of as high-pressure pumps. Their
positive displacement of fluid and fixed volume are the
result of the fluid being mechanically moved through their
pump passage on a regular cycle.Smaller than centrifugal
pumps. Quiet, do not ad much heat to the fluid, suitable
for shear sensitive fluids. These pumps have a diaphragm,
piston or plunger which is reciprocating back and forth
through a fixed stoke length.
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