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VARIABLE INLET VANE DAMPERS
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VIV dampers are often used for capacity
modulation. They give accurate modulation and power savings over other
styles of dampers at reduced air flow.
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For every inlet vane position there is
different capacity v/s static pressure curve and capacity v/s brake
horsepower curve generated by the blower.
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When an inlet vane is partially closed,
each blade directs the air into the impeller in the direction of
rotation and so the air is prespun. This brings about a reduction in
the capacity, static pressure and BHP. The amount of BHP savings at
reduced capacity is determined by the type of system and type of
blower-vane combination.
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Inlet guide vanes are synchronously
adjustable in the same angular position by a connecting element.
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Adjustment can be made either automatically
via an adjusting element by pneumatic / electrical or hand.
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