4578

DAMPERS

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Prepared by,

S. THIRUMANGAI ALWAR

STAFF NO: 12256 DUCTING/./852ENGG

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INDEX

INTRODUCTION

DEFINITION

TYPES

CONTROLING DEVICE

OPERATING PRINCIPLE

FIBER GLASS DAMPERS

INLET GUIDE VANE (RUSKIN MFG.)

DAMPER

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INTRODUCTION:

Damper is normally used for fan inlet, outlet and

air/gas lines to control the flow according to our requirement. It is also

used for isolation (or) shut-off purpose while id fan starting. The

operating conditions of the dampers are designed to match the

operating condition of the duct system.

DEFINITION:

Damper is a device which is used to control (or)

regulate the flow of air (or) gas for balancing a system.

TYPES:

MULTI FLAP DAMPER

LEAK PROOF DAMPER

MULTI LOUVER DAMPER

IGV (INLET GUIDE VANE)

RADIAL VANE DAMPER

POPPET DAMPER

STACK DAMPER

BUTTERFLY DAMPER

GUILLOTINE DAMPER

DIVERTER DAMPER

CONTROLLING DEVICE:

MANUAL

RPC (REGULATING POWER CYLINDER)

SOPC

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OPERATING PRINCIPLE:

Damper is operated by power cylinders (or)

manually. Main parts of the dampers are,

o SHAFT

o FLAP

o LEVER

o STOPPER PLATE

o LOCK PLATE

Power cylinders are controlled from DCS room. When we change

the signals to the power cylinder, according to this I/P signal the piston

movement will takes place. Due to this movement lever displacement

goes on.

The lever is connected to the all the flaps through the flap

support plates through lever –II (shown in fig.). These lever II

arrangements are connected to the shaft through support plates. So

the lever movement will cause the movement of the shaft to result flap

open/close. Number of flaps will selected according to the size of the

damper.

Stopper plate is used to arrest the movement of flap in opposite

direction. This plate is welded with the casing plate.

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Flaps opening direction is important for fan outlet damper.i.e

flow direction in the fan (Suction to delivery flow) is clockwise (or) anti

clockwise, depending upon this the flap opening will fix.

The fig .shows the main parts and operating arrangement of multi

louver damper.

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MULTI FLAP DAMPER

In Multi flap dampers the flap plate is straight one.

Small size of ducts only these kind of damper is used. The flap plate is

located sides of the rod. When movement of rod will cause the flap

open / close.

MATERIAL USED

In multi flap damper IS 2062 GR A material is used.

APPLICATION:

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Primary air lines.

Secondary air lines.

MULTI LOUVER DAMPER:

In Multi louver dampers, the flap plate is bend to the

diamond shape. According to the size of the damper no. of flap will fix.

In this damper double suction also available. In this double suction

single cylinder is used to move the two levers. Normally large duct size

these type of damper is used.

MATERIAL USED

In multi flap damper, IS 2062 GR A material is used.

APPLICATION

Suction and delivery for FD, ID fans.

LEAK PROOF DAMPER:

Leak proof damper are normally used in 2

fan applications.

MATERIAL USED

IS 2062 GR A and SA 240 GR 316 (SPRING QUALITY)

ADVANTAGE:

100% air leakage prevented.

Fan (IDLE FAN) damage will avoid due to the 100% leak

proof.

IGV (INLET GUIDE VANE)

This type of damper is normally used for

circular suction. The flaps are arranged in a circular manner.

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BUTTERFLY DAMPER;

It is designed for isolation and control in a system

(or) process.

ADVANTAGE:

All welded construction with replaceable

components, accessible for service and replacement.

POPPET DAMPER:

Designed for isolation in BAGHOUSE in stallions.

STACK DAMPER:

It is used in conjunction with HRSG units, the primary

function is to contain the temp with in the exhaust stack.

RADIAL VANE DAMPER:

It is designed to modulate the flow / pressure relationship of a

blower from the inlet side. It is use in clean and contaminated gas

streams in which light particulate may be encountered.

Standard actuations: manual, pneumatic and electric

ADVANTAGE:

Linkage tight and vibration free, allowing for smooth, low torque

operation.

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FIBERGLASS ROUND DAMPERS AND BACKDRAFT DAMPERS

INTRODUCTION:

Fiberglass Dampers are manufactured to meet the needs of the

air handling industry by providing a corrosion-resistant FRP Damper that is

used to regulate a gas flow or shut off and isolate a system. The operating

conditions for the dampers are designed to match the operating conditions of

the duct system. Premium vinyl ester resins are used throughout the damper.

Fire-retardant resins are also available for a Class I flame spread.

Dampers are used to control airflow for balancing a system. This model is

less expensive and has a shaft seal, but does not have a blade seal.

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Dampers are used to control airflow for balancing a system. This model

has a shaft seal and full circumferential blade stop

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Dampers are used for isolating a system with low leakage. This model

has a shaft seal, blade seal, and a full circumferential blade stop dampers are

designed for up to 30” wc with an AMCA certified leakage rate of 5.2 cfm/ft2

Below dampers are used for isolating a system, and has a PTFE

encapsulated O-ring to provide a bubble-tight seal. This seal is mechanically

fastened to allow easy replacement

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BACKDRAFT DAMPERS are designed to prevent air from flowing back into

the system when the fan is turned off. These may sometimes be referred to as

check valves.

CONSTRUCTION:

Bearings are mounted “outboard” to the damper body & contained in a

plastic sleeve. The bearing is Teflon and the seal is an appropriate elastomer

for the chemical service. All these contained within this sleeve with a retaining

nut. The blade is a heavy fiberglass disk. Care is taken to produce the highest

quality damper and tooling is used to manufacture reproducible and consistent

parts. The damper body is a one piece construction, hand fabricated on a

polished steel mold.

Dampers can be made with a variety of resins, cure systems, gasket

materials, shaft materials, internal hardware, external hardware, coatings,

flange patterns, actuators, and face to face lengths. This brochure includes our

standard construction materials. Contact Belco Manufacturing for other

available options.

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1'-0"

SECTION B

I.D. =

DAMP

ER SI

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SECTION A

DETAIL 1

BLADE SHAFT

BLADE STOP TO PREVENT OVER-ROTATION

TEFLON BEARINGFRP BUILD UP

FRP HOUSING

FLANGE W/ BLINDO-RING SEAL

FRP BACKING BLADE

FRP DRIVE BLADE

TEFLON BEARING

AAB B

BLADE STOP TO PREVENT

OVER-ROTATION

BLADE SEAL

1'-0"

DETAIL 1STANDARD STAINLESS STEEL LEVER HANDLE SHOWN. AVAILABLE WITH

ACTUATORS OR WHEEL OPERATORS.

316 SS BOLT, LOCKING WASHER, AND WING NUT

I.D. =

DAMP

ER SI

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MODEL 203 DAMPER DETAIL

STANDARD CONSTRUCTION:

Frame:  Vinyl Ester FRP Blade:  Vinyl Ester FRP

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Axle:  Vinyl Ester FRP or 316 SS Bearings:  Teflon

Sizes:   See table below Internal Hardware:  316 SS

Max Operating Temperature:  200°F Max System Pressure:  30” wc

Resin System:  Fire Retardant Vinyl Ester with

MEKP Cure System

Connections:  NBS PS 1569 Table

2 for Standard Ductwork

External Coating: Gel Cost with UV Inhibitors

(White, Gray, or Tan)

Gasket:  EPDM

Face to Face:  12" up to 48" size 

Actuator:  Locking Quadrant Hand Level through 20" Diameter, Aluminum Worm

Gear for larger than 20".  (Electronic, Pneumatic, and Chain-Wheel Operators are

available

Options:  Dampers can be made with a variety of resins, cure systems, gasket

materials, shaft materials, internal hardware, external hardware, coatings, flange

patterns, actuators, and face to face lengths.  Contact Belco Manufacturing for other

available options.

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SizesFlange

Thickness

Bolt Circle

Diameter

Bolt Hole

Diameter

Number of Bolt

holes

Blade

Edge Thicknes

s

Axle Diamet

er

6" 1/4" 10 3/8" 9" 7/16" 8 3/8" 3/4"

8" 1/4" 12 3/8" 11" 7/16" 8 3/8" 3/4"

10" 3/8" 14 3/8" 13" 7/16" 12 3/8" 3/4"

12" 3/8" 16 3/8" 15" 7/16" 12 3/8" 3/4"

14" 3/8" 18 3/8" 17" 7/16" 12 3/8" 3/4"

16" 1/2" 20 3/8" 19" 7/16" 16 3/8" 1 1/4"

18" 1/2" 22 3/8" 21" 7/16" 16 3/8" 1 1/4"

20" 1/2" 24 3/8" 23" 7/16" 20 1/2" 1 1/4"

24" 1/2" 28 3/8" 27" 7/16" 20 1/2" 1 1/4"

30" 1/2" 34 3/8" 33" 7/16" 28 1/2" 1 1/4"

36" 1/2" 40 3/8" 39" 7/16" 32 1/2" 2"

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42" 5/8" 46 3/8" 45" 7/16" 36 3/4" 2"

48" 5/8" 54 3/8" 52" 9/16" 44 3/4" 2"

54" 5/8" 60 3/8" 58" 9/16" 44 3/4" 2"

60" 5/8" 66 3/8" 64" 9/16" 62 3/4" 2"

72" 5/8" 78 3/8" 76" 9/16" 60 3/4" 2"

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STANDARD CONSTRUCTION

FRAME

10 (3.5) gage steel channel frame (see table).

BLADES

16 (1.6) gage steel.

BEARINGS

Stainless steel.

AXLES

1/2" (13) diameter plated steel.

THRUST WASHERS

Stainless steel.

HUB

Open (O).

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OPERATING LEVER

Crank Lever (CL) for motor operation or hand quadrant (HQ) for manual

operation.

FINISH

Aluminum paint.

MAXIMUM TEMPERATURE

200°F (121°C).

MINIMUM SIZE

12" (305) diameter.

MAXIMUM SIZE

65" (1651) diameter. Consult Ruskin for larger sizes.

VARIATIONS:

Variations to standard construction are available at additional

cost and include:

• Heavier construction for higher pressures, air flow

(cfm), and temperatures.

• Bullet nose (BN) and flat cap (FC) capped hubs.

• Cantilever (hubless) design.

• Special materials.

• Damper built into a fan inlet cone spinning furnished by

the customer.

• Bolt holes in flanges.

• Electric and pneumatic actuators.

NOTES:

Heavier duty dampers are available for applications, not covered by IVD standard

construction.

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Reference:

RUSKIN LTD, Kansas City.

BELCO LTD, New York.

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