A rectangular valve register, or multileaf valve, is used in a rectangular air transport system to control and/or mix air flows. If the valve blades are fitted with a rubber seal, the valve register can also be used to seal off air flows completely. The valve register can be designed as equal or contra-rotating.
Material quality and thicknesses
For normal comfort ventilation, valve registers are manufactured from the following materials:
- Casing: Sendzimir galvanised steel;
- Valve blades (equal or contra-rotating): Sendzimir galvanised steel, ifnecessary with rubber seal;
- Other choice of material, depending on the application, in consultationwith the supplier.
The valve register has rectangular connections and should be provided with a flange edge according to NEN-EN 1505 or ISO 13351, so that the fitting can be connected to the air duct system in a sound manner. The valve register can also be provided with a circular connection flange (one or two sides), so that the fitting can be connected to a circular air duct system.
The available nominal dimensions of the intermediate valve regulators are standardized to NEN-EN 1505 (rectangular connections) and can be selected as indicated in the tables for standard dimensions, as listed in this guide under section 126.96.36.199 (rectangular connections). They refer to internal dimensions with a tolerance of +0 to -5 mm. The dimensions depend on the manufacture.
Valve registers are to be fitted in accordance with the manufacturer's instructions. If present, they must at least comply with the requirements of paragraph 3.1.4.
Valve registers with circular connection flanges, fitted with rubber sealing rings, can be efficiently connected to air ducts and contribute to the airtightness of the air duct system, if the fittings have sufficient airtightness in accordance with NEN-EN 1751.