| Louver
Damper |
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Louver
Dampers are used for two functions;control
and/or isolation. There are three standard types: Parallel,Opposed
and Double Louvers. Each
louver has a row of blades that are used to control
or isolate the gas flow of any process system. The key
advantages of the louver damper include its fast operating
speed and minimum perimeter clearance requirements. |
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Parallel
Louvers are primarily used for isolation
applications. All of the blades rotate in the same direction.
With the addition of blade seals, this damper can achieve
better than 99% shut off. Parallel blade louvers are
also used on inlet boxes of large industrial fans to
promote pre-spin to the in rushing air, thus
enhancing fan performance. |
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Opposed
Louvers are used for process gas
control. The louvers function by rotating adjacent blades
in opposite directions. (One clockwise,the next blade
counterclockwise.) Operating the blades in this manner
gradually decreases or increases the cross-sectional
area between the blades during operation. This gradual
change in area allows this louver to have reasonably
good air control features. |
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Double
Louvers are designed to achieve zero leakage
isolation. Double louvers achieve zero leakage isolation
by pressurizing the space between the two louver dampers
with seal air. The seal air must be supplied at a pressure
higher than the pressure in the flue duct to operate
properly. |
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