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Volume Flow Limiter

Volume Flow Limiter

Product catalog summary

Description
The VFL Volume Flow Limiter is designed to simplify the adjustment of flow rates in ventilation and air conditioning systems. It allows for easy installation and precise operation, maintaining a constant flow rate even with changes in upstream pressure. Key features include close control accuracy of approximately ±10%, a flow rate range greater than 5:1, and a mechanical system-powered operation. It is maintenance-free, suitable for circular ducts, and operates within a temperature range of 0 to 50°C.

Dimensions
The VFL is available in various sizes with corresponding dimensions and weights. For example, size 80 has a diameter of 78 mm, a length of 86 mm, and weighs 0.10 kg.

Nomenclature and Technical Data
The document provides detailed nomenclature for flow rates and pressure differentials. The VFL operates within a differential pressure range of 30 to 300 Pa and is independent of orientation.

Acoustic Data
Sound pressure levels are provided for different sizes and pressure differentials, indicating the noise levels generated by the VFL in operation.

Installation Notes
Installation involves setting the required flow rate on-site and sealing the slot with a sticker for optimal acoustic performance. The VFL should be installed with a minimum straight upstream duct of at least 1 diameter.

Order Details
The VFL is available in six nominal sizes, made from high-quality plastic conforming to fire rating class B2. It features a mechanical system-powered control damper and is tested for function and set to a reference flow rate at the factory. Custom factory settings for different flow rate setpoints are available for orders of 50 or more per size.

Catalog excerpts

Volume Flow Limiter Type VFL for insertion into air ducting 5/9.2/EN/6 The art of handling air

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Contents 2 Description 3 Dimensions 3 Nomenclature 4 Technical data 4 Acoustic data 4 Installation notes 5 Order details 6 Adjust Insert Done!

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Description · Dimensions 3 Description The VFL volume flow limiter simply deals with what is normally the tedious and expensive process of adjusting flow rates in ventilation and air conditioning systems. Easy installation and precise operation saves precious time on site. The required flow rate can be simply set up at the point of installation when the VFL is fitted into the ductwork. The VFL controls to the set flow rate keeping it constant within close tolerances even when the upstream pressure changes. Characteristics – Very close control accuracy for the flow rate settings, to approx. ±...

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Installation Notes 5 Installation The required flow rate is simply set on site at the point of installation. The slot must then be closed with a sticker supplied to ensure best acoustic performance. The limiter can now be slid into the duct. The minimum straight upstream duct should be at least 1 D. Identification of the installation location Stickers are supplied for identifying the flow volume limiters once installed. These may be filled in by hand and affixed to the outside of the duct in an easily visible location. Flow rate adjustment, by the customer Transparent sticker for noise control...

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Order Details Design changes reserved · All rights reserved © TROX GmbH (08/2009) Specification text Circular volume flow limiter Type VFL in 6 nominal sizes, manufactured from high quality plastic (UL 94 V1) conforming to DIN 4102, fire rating class B2, for constant flow rate control, for use in air conditioning and ventilation systems, consists of a regulator with set point adjustment, the regulation mechanism with leaf spring and low friction, silicone free oscillation damper. Special characteristics: – Mechanical system-powered with a control damper – Very close control accuracy of approx....

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