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Vane Pumps

Vane pumps are positive displacement pumps that are well-suited for handling low viscosity liquids like propane, ammonia, solvents, and refrigerants. They work by using vanes mounted on a slotted rotor within a cam to sweep fluid through the pump chamber and out the discharge port. Vane pumps have advantages like their ability to handle thin liquids at moderate pressures, compensate for wear, and sometimes run dry for short periods. Their applications include fuel and refrigerant transfer, aerosol and propellant handling, and bulk transport of liquids like LPG and ammonia.

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Sudheer Nair
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432 views3 pages

Vane Pumps

Vane pumps are positive displacement pumps that are well-suited for handling low viscosity liquids like propane, ammonia, solvents, and refrigerants. They work by using vanes mounted on a slotted rotor within a cam to sweep fluid through the pump chamber and out the discharge port. Vane pumps have advantages like their ability to handle thin liquids at moderate pressures, compensate for wear, and sometimes run dry for short periods. Their applications include fuel and refrigerant transfer, aerosol and propellant handling, and bulk transport of liquids like LPG and ammonia.

Uploaded by

Sudheer Nair
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
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Vane Pumps

Vane Pump Overview


How Vane Pumps Work

Advantages & Disadvantages

Applications

Materials Of Construction / Configuration Options

Manufacturers

Vane Pump Overview


While vane pumps can handle moderate viscosity
liquids, they excel at handling low viscosity liquids such
as LP gas (propane), ammonia, solvents, alcohol, fuel
oils, gasoline, and refrigerants. Vane pumps have no
internal metal-to-metal contact and self-compensate for
wear, enabling them to maintain peak performance on
these non-lubricating liquids. Though efficiency drops
quickly, they can be used up to 500 cPs / 2,300 SSU.

Vane pumps are available in a number of vane configurations including


sliding vane (left), flexible vane, swinging vane, rolling vane, and external
vane. Vane pumps are noted for their dry priming, ease of maintenance, and
good suction characteristics over the life of the pump.
Moreover, vanes can usually handle fluid temperatures
from -32C / -25F to 260C / 500F and differential
pressures to 15 BAR / 200 PSI (higher for hydraulic vane
pumps).

Each type of vane pump offers unique advantages. For


example, external vane pumps can handle large solids.
Flexible vane pumps, on the other hand, can only handle
small solids but create good vacuum. Sliding vane pumps can run dry for
short periods of time and handle small amounts of vapor.
How Vane Pumps Work
Despite the different configurations, most vane pumps operate under the
same general principle
described below.

1. A slotted rotor is
eccentrically supported in
a cycloidal cam. The
rotor is located close to
the wall of the cam so a
crescent-shaped cavity is
formed. The rotor is sealed into the cam by two sideplates. Vanes or blades
fit within the slots of the impeller. As the rotor rotates (yellow arrow) and
fluid enters the pump, centrifugal force, hydraulic pressure, and/or pushrods
push the vanes to the walls of the housing. The tight seal among the vanes,
rotor, cam, and sideplate is the key to the good suction characteristics
common to the vane pumping principle.

2. The housing and cam force fluid into the pumping chamber through holes
in the cam (small red arrow on the bottom of the pump). Fluid enters the
pockets created by the vanes, rotor, cam, and sideplate.

3. As the rotor continues around, the vanes sweep the fluid to the opposite
side of the crescent where it is squeezed through discharge holes of the cam
as the vane approaches the point of the crescent (small red arrow on the
side of the pump). Fluid then exits the discharge port.

Advantages Disadvantages
Handles thin liquids at relatively Can have two stuffing boxes
higher pressures Complex housing and many
Compensates for wear through parts
vane extension
Not suitable for high pressures
Sometimes preferred for
solvents, LPG Not suitable for high viscosity

Can run dry for short periods Not good with abrasives

Can have one seal or stuffing


box
Develops good vacuum

Applications
Aerosol and Propellants
Aviation Service - Fuel Transfer, Deicing

Auto Industry - Fuels, Lubes, Refrigeration Coolants

Bulk Transfer of LPG and NH3

LPG Cylinder Filling

Alcohols

Refrigeration - Freons, Ammonia

Solvents

Aqueous solutions

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