Damper valves type AFT-DV and AFT-LDV (catalog) in T (tandem) or DB (double blade) execution are of welded construction and are designed for a 100% tight shut-off of media such as air, process gas, etc.
Such gas-tight shut-off applications are required in flue gas desulphurisation, dust extraction of furnaces, utilisation of SO2, SO3, NOX as well as for air tight sealing of production processes in smelters, chemical and paper industry, non-ferrous metals smelters, etc.
Due to their material selection, their precise execution, and control devices these dampers have to be important and reliable components of a plant and are subject to technical tests, especially concerning their tightness.