The circular volume flow control damper with a self-cleaning Venturi nozzle flowmeter system is based on DIN EN ISO 5761-1 for measuring differential pressure with an external differential pressure sensor. It controls and blocks air flow in corrosive environments. Under this measuring principle, the differential pressure, which rises as the volume increases, builds up in the air duct via a Venturi nozzle as the flow velocity changes due to changes in cross-section. The buildup in pressure ensures an adequate differential pressure even at small air volumes to precisely balance the desired volume flow and minimizes losses with a suitable design.
The housing air leakage flow complies with DIN EN 1751, Class C. The damper position can be viewed from the outside on the axis.
The nominal diameters are selected so that the dampers can be connected directly to standardized circular ducts via flange connections without additional adapters.