VFL

Volume flow limiter for insertion into ducting

Circular, mechanical self-powered controllers for insertion into ducting, for the quick and easy balancing of constant volume flow rates in ventilation and air conditioning systems

Unique damper blade edge for acoustic optimisation
Simple and quick commissioning on site
Range of volume flow rate setpoints for each nominal size
Precise and simple setting of volume flow rates using a scale
Best accuracy among controllers for insertion
Suitable for low airflow velocities from 0.8 m/s
Any installation orientation; maintenance-free

APPLICATION

Application

Circular volume flow limiters of Type VFL for the simple balancing of volume flow rates in air conditioning systems
Mechanical self-powered volume flow limiter without external power supply
Simplified project handling with orders based on nominal size
Set the required volume flow rate using a scale

Special features

Mechanical self-powered
Low-friction bellows
For circular ducts
Lip seal for tight and secure fit
Aerodynamically tested and factory set to a reference volume flow rate
Sticker showing volume flow rates (in l/s, m³/h and cfm) that can be set each limiter

DESCRIPTION

Parts and characteristics

Ready-to-commission limiter
Damper blade with low-friction bearings
Bellows that acts as an oscillation damper
Leaf spring
Lip seal
Multi-level volume flow rate setpoint values

Construction features

Circular casing
Suitable for insertion into circular ducts to EN 1506 or EN 13180
Lip seal for tight and secure fit
Acoustically optimised damper blade with low-friction bearings and special bellows
Different damper blade construction and volume flow rate sticker for nominal size 150

Materials and surfaces

Casing and damper blade made of high-quality plastic, to UL 94, V1; to DIN 4102, material classification B2
Leaf spring made of stainless steel
Polyurethane bellows

Technical information

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.

Circular volume flow limiters in 7 nominal sizes, made of high-quality plastic, to limit and control volume flows in air conditioning systems.

Ready-to-commission unit which consists of the casing with setpoint scale and the control mechanism with leaf spring and low-friction, silicone-free bellows.

Easy insertion into circular ducts to EN 1506 or EN 13180; secure fit ensured by a lip seal.

Aerodynamically tested and factory set to a reference volume flow rate. Can be subsequently accurately adjusted within a volume flow rate range of at least 5 : 1.

Special features

Mechanical self-powered
Low-friction bellows
For circular ducts
Lip seal for tight and secure fit
Aerodynamically tested and factory set to a reference volume flow rate
Sticker showing volume flow rates (in l/s, m³/h and cfm) that can be set each limiter

Materials and surfaces

Casing and damper blade made of high-quality plastic, to UL 94, V1; to DIN 4102, material classification B2
Leaf spring made of stainless steel
Polyurethane bellows

Technical data

Nominal sizes: 80 – 250 mm
Volume flow rate range: 4 to 212 l/s or 14 to 764 m³/h
Volume flow rate control range: < 20 to 100 % of the nominal volume flow rate
Volume flow rate accuracy: approx. ± 10 % of the nominal volume flow rate
Minimum differential pressure: 30 Pa
Maximum differential pressure: 300 Pa

Downloads

product information

Type VFL

K5 – 2.1 – 1 Technical Leaflet 860 KB pdf

certificates

EPD-VFL

Declaration 1,2 MB pdf
Egenerklæring

Statement 700 KB pdf

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