Technical Documentation Constant flow rate control / shut-off unit type VRW-A LTG Aktiengesellschaft 70435 Stuttgart, Grenzstraße 7, Germany Tel. +49 711 8201-0, Fax +49 711 8201-720 [email protected] www.LTG-AG.com 105 Corporate Drive, Suite E Spartanburg S.C. 29303, USA Tel. +1 864 599-6340, Fax +1 864 599-6344 [email protected] www.LTG-INC.net Via Matilde Serao 5, 20144 Milano (MI), Italy Tel. +39 02 9550535, Fax +39 02 9550828 [email protected] www.LTG-SRL.com

Constant flow rate control and shut-off unit type VRW-A Notes Dimensions stated in this brochure are in mm. Dimensions stated in this brochure are subject to General Tolerances according to DIN ISO 2768-vL. Straightness and twist tolerances according to DIN EN 12020-2. The actual specifications are at the end of this document. They are available as a word document at your local distributor or at www.LTG-AG.com. E LTG Aktiengesellschaft Grenzstraße 7 70435 Stuttgart Germany Tel. +49 711 8201-0 Fax +49 711 8201-720 [email protected] www.LTG-AG.com Printed in Germany · Former editions are invalid...

Constant flow rate control and shut-off unit type VRW-A The constant flow rate control and shut-off unit type VRW-A is the combination of a mechanically self-operated constant flow rate controller and a shut-off damper. Unit view Figure: Interior view Design, characteristics The duct casings are made from hot galvanized sheet steel. The flow rate controller and the shut-off damper assemblies are supplied as one piece with suitable sealing. For the shut off damper, there is an oval damper blade of galvanized sheet steel sealed with a felt gasket as standard (or polymer seal to DIN 1946/4 using...

Constant flow rate control and shut-off unit type VRW-A Flow rate and pressure range Surface [m2] Minimum pressure loss Nominal diameter Minimum flow rate Maximum flow rate Minimum pressure loss Maximum pressure loss Example: Flow rate controller: Type VRW-A Nominal diameter: Flow rate: Mimimum static pressure difference p according to chart: E LTG Aktiengesellschaft Grenzstraße 7 70435 Stuttgart Germany Tel. +49 711 8201-0 Fax +49 711 8201-720 [email protected] www.LTG-AG.com Printed in Germany · Former editions are invalid · Subject to technical modifications

Constant flow rate control and shut-off unit type VRW-A Damper angle [_] insulated case Version without insulated case, including Belimo NM .. actuator 139 Version with insulated case, including Belimo NM .. actuator 81 E LTG Aktiengesellschaft Grenzstraße 7 70435 Stuttgart Germany Tel. +49 711 8201-0 Fax +49 711 8201-720 [email protected] www.LTG-AG.com Printed in Germany · Former editions are invalid · Subject to technical modifications

Constant flow rate control and shut-off unit type VRW-A Airborne sound transmission Static pressure difference at the controller [Pa] Power level LWtot A-weighted [dB(A)] Octave power level* LW [dB/Oktave] Power level LWtot A-weighted [dB(A)] Octave power level* LW [dB/Oktave] Power level LWtot A-weighted [dB(A)] Octave power level* LW [dB/Oktave] *Sound power level in dB/octave ref to 10-12 W The flow rate controller's sound power may be increased in case of additional sound sources (e.g. fan, unfavourable flow conditions etc.). If this additional sound power level is more than 10 dB below the...

Constant flow rate control and shut-off unit type VRW-A Sound level correction values for sound emission calculation Deduct the values given in this chart from the ”Airborne Sound Transmission” values on page 6. Duct with 50 mm insulation and sheet steel casing The acoustic data given include a +/- 3 dB tolerance. E LTG Aktiengesellschaft Grenzstraße 7 70435 Stuttgart Germany Tel. +49 711 8201-0 Fax +49 711 8201-720 [email protected] www.LTG-AG.com Printed in Germany · Former editions are invalid · Subject to technical modifications

Constant flow rate control and shut-off unit type VRW-A Nomenclature VRW-A Mechanically self-operated constant flow rate controller, round, with integrated shut-off damper Size or diameter 100 125 140 160 200 250 315 400 Version steel, galvanized S stainless steel V4A (1.4571) F flow rate controller with PUR finish shut-off damper of V4A (1.4571) K Insulated case without with 1.Dient zur Identifizierung der letzten Seite E LTG Aktiengesellschaft Grenzstraße 7 70435 Stuttgart Germany Tel. +49 711 8201-0 Fax +49 711 8201-720 [email protected] www.LTG-AG.com Printed in Germany · Former editions are...

Specification and schedule of prices Constant flow rate control and shut-off unit type VRW-A August 2011 / page 1 of 2 Quantity Description of services Mechanically self-operated constant flow rate controller type VRW without auxiliary power supply, with integrated shut-off device. For any installation type, suitable for differential pressures of 50 … 1000 Pa, control precision +/- 10%. Suitable for on site change to the factory-set flow rate, using an adjusting ring with a flow rate scale. Consisting of: - Casing of galvanized sheet steel. Connection: self-seal system on the flow rate controller...

Constant flow rate control and shut-off unit type VRW-A Office East 2 Sales area: postcode 01 - 09, 98 - 99 Johannes-Ebert-Straße 20 · D-09128 Chemnitz Herr Schenfeld +49 371 77118-01, Fax -02 E-mail: [email protected] ArGelo S. A. R. Luis Pastor de Macedo · Lote 28 B, P-1750-158 Lisboa +351 21 75201-20, Fax -29 · E-Mail: [email protected] Office East 1 Sales area: postcode 10 - 25, 39 Eisenhutweg 51a · D-12487 Berlin Herr Linke +49 30 632287-74, Fax -75 E-mail: [email protected] Laminair AG Kirchbergstrasse 105 · CH-3400 Burgdorf +41 34 42002-10, Fax -11 · E-Mail: [email protected] Office North...