General information VFL
Schematic illustration of the VFL
Functional description
The volume flow limiter is a mechanical self-
powered unit and works without external power
supply. A damper blade with low-friction bearings
is adjusted by aerodynamic forces such that the
set volume flow rate is limited as a consequence.
The aerodynamic forces of the airflow create a
closing torque on the damper blade. The bellows
extends and increases this force while at the
same time acting as an oscillation damper. The
closing force is countered by a leaf spring. As
the differential pressure changes, the leaf spring
adjusts the position of the damper blade such
that the volume flow rate is limited.
Efficient commissioning
The volume flow limiter performs the previously
tedious and expensive balancing of volume flow
rates in ventilation and air conditioning systems.
Simple handling and perfect function help to save
valuable working time on site. The required
volume flow rate can be set at the point of
installation, then the volume flow limiter is inserted
into the duct. The set volume flow rate will then be
limited and maintained within close tolerances.
Function
Control damper blade
Bellows inlet
Bellows
Crossbar
Volume flow rate scale
04/2014 US K5 – 2.1 – 4
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