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pump
is a mechanism through which force is applied to a liquid
. There are two basic categories of pumps: positive displacement and
centrifugal.
1- Positive
displacement pumps force liquid to flow in volumetric proportion to
decreasing pump volume. Hydraulic systems are a primary application,
wherein the hydraulic fluid functions as the lubricant. Positive
displacement pumps can be divided into reciprocating and rotary.
Reciprocating pumps use pistons, plungers, or diaphragms to increase and
decrease volume. Rotary pumps use a rotating device (gear, screw, or vane)
to force liquid from the pump.
2-
Centrifugal pumps, also called kinetic pumps, differ from
positive displacement pumps in that they provide uniform (non-pulsing) flow
and adjustable flow velocity. Movement is imparted to the liquid through
centrifugal force created by a rotating impeller. There are two basic types
of centrifugal pumps: radial flow and axial flow.
In the former type, liquid enters the pump at the
impeller’s axis of rotation and is forced outward by vanes. In the latter
type, a propeller or screw on a rotating shaft moves liquid in the axial
direction of the shaft.
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44221.3057
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© 1995-2005 REAL Services® U.S.A.
- Analytical Almanac
All Rights Reserved
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