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TROX VFR – For the reliable balancing of volume flow rates

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For the reliable balancing of volume flow rates

Circular flow adjustment dampers for the balancing of volume flows and pressures in supply air and extract air systems

Each flow adjustment damper carries a diagram with setting values that ensure rapid commissioning on site
Suitable for duct pressures up to 4.02 in w.g.
Volume flows can be set using a hand wheel and a scale on the outside of the casing
Simple retrofit of an actuator
Casing air leakage according to EN 1751, class C

Optional equipment and accessories

Actuator with potentiometer
Actuator with mechanical stops

SKU: VFR Category: Shut-Off and Throttle Devices Tag: VFR

General Information

Application

Circular flow adjustment dampers Type VFR for the simple balancing of volume flows and pressures in air conditioning systems
Continuous variable adjustment of the volume flow by means of a hand wheel with position indicator
Simple retrofitting of an actuator
Pressure dependent leakage airflow with minimal setting (setting 0)

Special characteristics

Diagram with setting values on each flow adjustment damper
Simple retrofitting of an actuator

Nominal sizes

3, 4, 5, 6, 7, 8, 9, 10

Construction

Galvanised sheet steel
A2: Stainless steel

Parts and characteristics

Ready-to-install flow adjustment damper
Hand wheel with position indicator
Continuous variable adjustment from 0 to 10
Diagram with setting values
Lip seal

Attachments

Min/Max actuators: actuators for switching between minimum and maximum volume flow setpoints
Modulating actuators: actuators for varying volume flow setpoints

Construction features

Spigot with lip seal, for circular connecting ducts to EN 1506 or EN 13180
Very good dimensional stability due to double grooves
Damper blade with a 0.12 in circumferential gap, without a seal

Material and surfaces

Hand wheel, damper blade and plain bearings made of plastic, flame retardant (V-0) to UL 94

Galvanised sheet steel variant

Casing made of galvanised sheet steel

Stainless steel variant (A2)

Casing made of stainless steel 1.4301

Standards and guidelines

Meets the hygiene requirements of VDI 6022
Casing air leakage according to EN 1751, class C

Maintenance

Maintenance-free as construction and materials are not subject to wear

Disclosure of Chemicals

RoHS EU Directive 2011/65/EU (RoHS)
- This product or single variants comply with EU Directive 2011/65/EU (RoHS) on the restriction of the use of certain hazardous substances in electrical and electronic equipment. For more information, please refer to our Environmental Product Declarations.
REACH 1907/2006 (EC Regulation REACH)
- This product or single variants comply with the provisions of EC Regulation No. 1907/2006, also known as REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals). For more information, please refer to our Environmental Product Declarations.

Function

For balancing the volume flows of duct sections and air terminal devices the differential pressure must be set on the flow adjustment dampers. The value to be set for a certain required volume flow at a given differential pressure can be taken from the diagram with setting values that each flow adjustment damper carries. This value can then be set using the hand wheel with the position indicator (continuous adjustment between 0 and 10).

Schematic Illustration of the VFR

1 Damper blade
2 Volume flow scale
3 Hand wheel
4 Hand wheel locking screw
5 Lip seal
6 Diagram with setting values

Specification Text

This specification text describes just one variant of the product and applies to many applications. Texts for variants can be generated with our Easy Product Finder design programme.

Specification text

Circular flow adjustment dampers for the balancing of volume flow rates in ventilation and air conditioning systems, for supply air and extract air, available in 10 nominal sizes. Suitable for duct pressures up to 4.02 in w.g. Ready-to-install unit which consists of the casing with damper blade and rotary knob for the infinitely variable adjustment of volume flow rates. Spigot with lip seal for

ducts according to EN 1506 or EN 13180. Casing leakage to EN 1751, class C.

Special features