LOUVRE DAMPERS
Louvre Dampers can be manufactured circular or rectangular, and in a variety of configurations.
Generally, multi-blade louver dampers are used as control dampers - or as isolation dampers in rectangular or square ducts of a large cross sectional area, where use of a single blade would be impractical.
Due to the multiple blade arrangement, sealing efficiencies are lower than in single blade butterfly dampers.
However, by placing two louver dampers adjacent to each other and purging the cavity between the two sets of blades when closed, with air at a higher pressure than the system pressure, total isolation of process gas may be achieved.
When used as control dampers,
the blades are normally arranged to counter rotate, this provides very good control characteristics through the entire range of operation.
Materials of construction, gland seal and bearing arrangements and drive configurations are selected and designed to suit the application and customer requirements.
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