Dampers for Industrial Plants, FELLOW CO.,LTD.

Construction

Used for preventing reverse flow, in high close bypass duct and shut-off for maintenance.
Suitable for use in gas duct of dense dust.

1. It consists of casing, blades, shaft, gland packing, sealing mechanism and actuators.
2. Normally the blades are rotated 0 to 90 deg. and shut-off the flow.

Product Line

1. Round or rectangular, both diameter up to 6000mm and the following types,

   1) Normal Type:up to 350℃

   high close: packing

   2) High Temperature Type
   : from 351℃ to 450℃

   high close: packing

   3) Anti-Erosion Type

   high close: packing
   (Resin lining, Hastelloy lining, also available)

   4) Anti-Abrasion Type

   high close: packing

   5) Zero-Leak Type

   TWO blades and ZERO leakage by seal air between the blades.

2. Actuator: Air, Electrical, Hydraulic types and Manual type are available.

Special features

1. High Sealing
   Ensure high sealing for long period by applying endless processing, using gum packing, metal packing and NASRON packing and also applying our unique design of blades.
2. Decrease the required torque
   Decrease the torque by adjusting the shaft position, in comparison with standard flap damper and economical.
3. Protection of sealing part against dense dust
   Movement of blades is ONE direction and by arranging the seals at downstream of the flow, avoid the direct contact of seals with the gas and mitigate the damages of seals.
4. Minimum pressure loss
   Blade support is designed to mitigate the irregular flow and no partitions in the casing and realize the similar pressure loss to the butterfly damper upon full open.

Special features

For prevention of reverse flow in stack fan, in Boilers for power generation, Incinerators, Iron & Steel Plant, Cement Plant, Oil Refinery, De-NOx, De-SOx plants, EP, Bag Filters, Coal Mills, etc.