Type E volume flow rate controllers are mechanical system powered controllers for constant volume systems. The volume flow rate controller operates without an external power supply. A control blade supported in bearings is positioned by aerodynamic forces such that a pre-set volume flow is maintained constant over the entire differential pressure range.
The aerodynamic closing force on the control blade is amplified by the inflating bellows which also acts as an oscillation damper. A suitably calibrated leaf spring acts against the closing force (see diagram). The leaf spring is adjusted via a cam disc such that as the pressure differential changes, the angle of the control blade is adjusted to provide a constant flow rate within a close tolerance. The volume flow can be accurately set using an external scale with indicator. To simplify on site installation, controllers need only be installed on a size basis and the actual volume flow easily and accurately set up during commissioning.
The required volume flow can be set using the external scale on the type E controller by means of the settings on the arm without site flow measurement. The advantage over conventional dampers is that repeated measurements and adjustments by a qualified commissioning engineer are no longer required. lf the system pressure changes, e.g. due to the opening or closing of duct sections, the volume flows in the entire system change; this is not the case when type E volume flow controllers are used. The controllers respond immediately and adjust the damper positions directly so that the set volume flow is held constant over the entire differential pressure range. The volume flow rate controller type E can be supplied with an electric actuator for changing the set value.
The Volume Flow Controller type E has flanges on both ends for airtight connection.
If required the attenuation TX can be used to reduce discharge noise levels (installation on site).
Datasheet: Volume Flow Rate Controller CAV
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