Volumetric flow controller VLV55 | 65

Fields of application

For controlling variable and constant volumetric flows in ventilation and air-conditioning installations, particularly suitable for low air velocities of between 0.5 and 8 m/s and low duct pressures.

Function

The volumetric flow controller regulates the air volume throughput either constantly or variably.
For the measurement of the effective pressure, SCHAKO is using its measuring method by means of a standardised Venturi nozzle made of aluminium to DIN EN ISO 5167. In front of the Venturi nozzle and in the nozzle neck, the volumetric flow controller is fitted with openings for pressure take-off. The resulting differential pressure (effective pressure) is measured and evaluated by a universal or compact controller.
The VLV measurement principle allows measurement of small volumetric flows. In comparison with measuring rods, measuring crosses or measuring orifices having fewer measuring points, this gives higher accuracy, allowing the inflow area required in front of the volumetric flow controller to be omitted. This also allows smaller measurement tolerances to be achieved.
The volumetric flow controllers of the VLV type are insensitive to dirt caused by dust and can be installed and used independently of their position.
The error of measurement is ± 5 to 15% of the rated volume.

Volumetric flow range

13 – 2195 m³/h
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