AS Single Expansion Joint
FIT, FORM and FUNCTION
Butterfly dampers are crucial components in the regulation and control of air, gas, or particulate flow within ductwork and process systems. Named from the unique “butterfly” shaped disk that pivots within a circular enclosure to allow, restrict, or shut off flow. Unlike other damper types, butterfly dampers offer swift operation, low pressure drop, and a compact design, making them indispensable in both large and small-scale industrial environments.
Butterfly dampers modulate flow by rotating the disk, which is positioned by an actuator. This versatility allows for fine control—ranging from full closure to wide-open positions—suited to the demands of complex industrial processes. Butterfly dampers are made from a range of materials, such as stainless steel, carbon steel, or specialized nickel alloys, ensuring durablity with high temperatures, corrosive environments, or abrasive particulates.
The engineering and robust construction of industrial butterfly dampers make them a preferred choice wherever precision airflow management is required, ensuring safety, process optimization, and environmental compliance across a broad spectrum of modern industries.
AS Single Expansion Joint Fit:
- Bellows may be attached or linked to piping flanges, pipe, or other typical
industrial connections.
- End connections may conform to standards such as ASME B16.5, ASME B36.10, or customer designed.
- Fittings may be the same at each end or different.
AS Form:
- Single circular metal bellows, or 1 or more convolutions.
- Typical dimensions of ½” ANSI NPS to 240” ID. Overall length may vary,
typically within the range of 6” to 30”. - Bellows may include reinforcement or controlling members
- Convolutions may be U shaped or toroidal
- Additional accessories may be incorporated such as load bearing
restraints, movement limiters, protection devices.
AS Function:
- Absorbs piping (thermal) movement, primarily axial but could include lateral
and angular movements. - Movement amplitude varies, typically within the range of 1/32” to 6”.
- Movement frequency may be extreme low cycle (1 per year), or high cyclic
(such as vibration at 60 Hz).
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