Type 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

Volume flow limiter Type VFL 00134342_0
  • Application
  • Description

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

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, V0; to DIN 4102, material classification B2
  • Leaf spring made of stainless steel
  • Polyurethane bellows

Technical information

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code
Schematic illustration of the VFL 00119710_0..

① Damper blade

② Bellows inlet

③ Bellows

④ Crossbar

⑤ Volume flow rate scale

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.

Nominal sizes80 – 250 mm
Volume flow rate range4 – 212 l/s or 14 – 764 m³/h
Volume flow rate control range< 20 – 100 % of the nominal volume flow rate
Volume flow rate accuracyapprox. ± 10 % of the nominal volume flow rate
Minimum differential pressure30 Pa
Maximum differential pressure300 Pa
Operating temperature10 – 50 °C


Quick sizing: Sound pressure level at differential pressure 50 Pa

Nominal sizeVVAir-regenerated noise
Nominal sizeVVLPA
Nominal sizel/sm³/hdB (A)
80 4 14 30
80 6 22 30
80 14 50 32
80 20 73 33
80 23 82 34
100 5 18 31
100 11 39 33
100 16 58 35
100 26 92 36
100 34 122 37
125 11 39 36
125 19 69 37
125 27 98 37
125 42 150 38
125 54 195 39
150 14 50 32
150 29 105 32
150 44 160 33
150 57 205 33
150 74 265 34
160 16 58 26
160 28 102 29
160 49 175 32
160 67 242 34
160 90 323 36
200 26 94 23
200 70 253 27
200 109 391 30
200 134 481 31
200 147 529 31
250 44 159 23
250 94 337 26
250 144 519 28
250 175 632 28
250 212 764 28


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, V0; 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

00132648_0

 Type
VFL       Volume flow limiter

 

 Nominal size [mm]
80
100
125
150
160
200
250

 

References

Motel ONE, Wien-Staatsoper

  • Information about the Building
Project: Motel ONE, Wien-Staatsoper
Market segment: Hotels
Location: Vienna, Austria
Building type: renovation
Year of completion: 2014
 


Construction company: Immorent
Architect: Moser Architekten
Designer: TB Hammer
 
Total air volume: ~ 30.000 m3/h
 


TROX-Products
  • Air diffusers: VDW
  • Control units: VFL
 

Privatklinik – Filip II, Skopje

  • INFORMATION ABOUT THE BUILDING
Project: Private hospital – Filip II, Skopje
Application: Hospitals
Location: Skopje, Macedonia
Building type: new building
Year of completion: 04.2015
 
Construction company: Privatklinik – Filip II; Dr. Zan Mitrev
Architect: Etapaproekt
Designer: Energosistem und BO&CO
 
Total air volume: app. 190.000 m3/h
 
TROX-Products
  • Air diffusers: VDW, SL-AG /VAT-AG
  • Air-water systems: DID632
  • Control units: TVR-Easy / TVJ-Easy, VFL
  • Sound attenuators: CS050,  TX
  • Fire and Smoke Protection: FKA-EU
  • Filter units: TFC, IF691
  • Filter elements: MFPCR-H14, MFP-H13
  • Central air handling units: X-CUBE 2520, X-CUBE 3525, X-CUBE 3530, X-CUBE 2525 - hygiene construction variant
  • External louvres: JZ-AL
 

Wittlinger Therapiezentrum

  • Description
Project: Wittlinger Therapiezentrum 
Application: Hospital
Location: Walchsee, Austria
Building type: building extension
Year of completion: 10.2014
 
Construction company: Wittlinger Therapiezentrum GmbH
Architect: Architekten Moritz u. Haselsberger
Designer: Tivoliplan
 
Total air volume: 4.500 m3/h
 
 
 
TROX-Products

  • Air diffusers: air grilles TRS-R, swirl diffusers FD
  • Control units: volume flow controller TVJ-Easy, VFL, RN
  • Filter units: particulate filter air terminal devices F646V1D
  • Central air handling units: X-CUBE 2010
 

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