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
small_tab1_Serie VFL
  • 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, V1; to DIN 4102, material classification B2
  • Leaf spring made of stainless steel
  • Polyurethane bellows

Teknisk information

  • Function
  • Technik
  • Quick sizing
  • Specification text
  • Order code
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.

vfl
vfl

 

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
vfl

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Tel.: +47 61313500 | Fax: +47 61313510

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Fält markerade med en (*) är obligatoriska.

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Tack for ditt meddelande!

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