Reinforced retaining ring (facilitates maintenance, protects the seal against tearing and acts as a deflector)
Damper valves DV LDV as T (tandem) or DB (double blade) execution are of welded construction and are designed as 100% tight valves to shut-off media such as air or process gas.
The design involves injecting air produced by a fan between the two discs, in order to create overpressure and ensure a seal between the upstream and downstream sides of the valve.
Due to their material selection, precise execution and control technology, these dampers are usually important components of a plant with high expectations of reliability. As such, they are subject to thorough testing, especially concerning their tightness.
Industrial Applications of Rectangular Butterfly Dampers
- Flue gas desulphurisation
- Dust extraction of furnaces
- Utilisation of SO2, SO3, NOX
- Air-tight sealing of production processes in smelters
- Chemical and paper industry
- Glass smelters
- Non-ferrous metals smelters
Technical Characteristics of Air Sealed Multi-Blade Dampers
Dimensions range MLDVR-T : max. 12000 x 12000mm (larger sizes on request)
Design pressure : < 0,5 bar
Temperature range: -20°C up to +750°C or acc. to customer request (max. working temperature up to 1100ºC)
Gland packing : Graphite (other depending on medium and temperature)
Installation of dampers : face-to-face length, working position (acc. to customer requirements)
Materials: Depending on medium, temperature, customer reqiurements
Actuators:
- Pneumatic quarter turn or linear actuators with accessories acc. to technical and customer requirements
- Electric quarter turn actuators with accessories acc. to technical and customer requirements
Special design:
- Actuating systems equipped with electric actuators, electromagnetic couplings,
hydraulic dampers (quick closing or quick opening valves for emergency modes of operation) - Actuating systems with counterweights or return springs (quick mechanical safety actuators in case of emergency – closing or opening)
