Effox-Flextor-Mader (EFM) has installed Butterfly Dampers from 12 inches (305 mm) in diameter to greater than 144 inches (3658 mm) in diameter. Our Butterfly Dampers can be found in some of the harshest environments where abrasion, corrosion and dust loading are prevalent.
EFM has a wide range of drive options from simple shaft mounted pneumatic actuation, to heavy-duty electric and hydraulic actuation with fail safe configurations.
Depending on the application, seat configuration can play a major role in the reliability of any damper. Our tadpole composite seats offer very tight shut- off, as much as 99.9 percent of flow, without the use of seal air fans. EFM offers many configurations to meet your application. Blow-off configurations are also available for high dust-loading environments.
EFM offers a unique “zero- leakage” stuffing box which ensures no leakage to atmosphere through the damper shaft. Machined coupling glands and compression glands are also available.
EFM butterfly dampers are available with simple blades, structural blades, thermally compensating blades, and profiled blades. For applications where heat retention is necessary, blades can be insulated.