Constant volume damper
Commissioning Air Systems (BG 49/2015), written by Chris Parsloe and published by BSRIA in March 2015, explains how to commission ducted air distribution systems in buildings. It was originally published in 2013 and was then updated in 2015.
It states: ‘Constant Volume Dampers (CVD's) work by means of a damper pushing against a pre-calibrated piston or spring device. The higher the velocity pressure acting on the face of the damper, the more the damper closes to restrict flow. The result is a constant flow rate provided that the pressure differential across the device is within the manufacturer’s stated minimum and maximum differential pressure limits. The required flow rate can be set and locked using the dial provided.’
--BSRIA
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