BUTTERFLY DAMPERS
These can be manufactured circular or rectangular, in a variety of configurations to suit a multitude of applications.
Although mainly used for isolation, they can be used for control.
Sealing arrangements range from "swing through" for control only to stainless steel flexible blade seals for isolation efficiencies greater than 99% sealing efficiency.
Bearings can be mounted inboard or outboard, depending on the application, and will generally be of the maintenance free type.
Dampers can be manufactured in a variety of materials and can be supplied with refractory lining if required.
Applications range from simple isolation dampers at ambient temperatures with manual lever arm operation to control dampers at temperatures as high as 2000°C (water cooled casing and blade).
Actuation can be arranged to suit customers requirements and could include any of the following:
- Pneumatic linear or rotary double acting with positioner and position feedback unit if required.
- Electric with "Matic" unit and manual override hand wheel.
- Hydraulic or electro-hydraulic
- Manual lever arm with locking quadrant or manual gearbox with hand or chain wheel.
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