Dampers for Industrial Plants, FELLOW CO.,LTD.

PRODUCT

Double Flap Damper

Double Flap Damper

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 (two), shaft (two), gland packing (two), sealing mechanism and actuators.
  2. Normally the blades are rotated 0 to 90 deg. and shut-off the flow.Since the blades are divided in two parts, upon full open, the sting-out of blades out of casing is short.

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

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

Special features

  1. High Sealing
    Ensure high sealing by applying endless processing, using gum packing, metal packing and NASRON packing.
  2. 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.
  3. Minimize the distance of damper
    Since Two blades swing in the damper, compared with single flap damper, the damper width and weight can be reduced about half to one fourth.
  4. Anti-abrasive effect
    Protect blades, shaft and arms against abrasion by abrasive gas of clinker waste gas, sintering gas, and others as these parts are located behind the partition plate in the center of casing.
  5. Realize Minimum pressure loss
    Blade support is designed to mitigate the irregular flow and realize the low pressure loss.
Double Flap Damper

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.

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