Volume Dampers · 2019. 7. 13. · operated quadrant. Exposed linkage, a shaft for pneumatic or electric motor operation are optionals. Pre-punched holes, to the frame for installing

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CHAPTER-13VOLUME CONTROL DAMPERSINDEX o Volume Control Dampers

o Round Volume Control Dampers

o Motorized Volume Control Dampers

o Constructional Details

o Engineering and Performance Data

o Pressure Drop

o Leakage Factor

o Torque Co-efficient

o Easy Selection Graphs

o Volume Control Dampers Fixing Details

o Ordering Data

TECNALCOVOLUME CONTROL DAMPERS

VOLUME CONTROL DAMPERS

TECNALCO, an industry, leader in quality air moving products, manufactures high quality aerofoil and ordinary type volume control dampers.

TECNALCO multi blade volume control dampers are used in heating, ventilating, air conditioning plants and applications, where they are not subjected to water spray, salt spray and other corrosive fumes.

TECNALCO standard and low leakage control dampers are designed for economical and reliable air volume control.

Features:

Available in two different types of constructions(1) Ordinary type and (2) Aerofoil type.

1. Ordinary type construction

2. Aerofoil type construction

a. Parallel blade operationb. Opposed blade operation

a. Parallel blade operationb. Opposed blade operation

All types and models of volume control dampers are made of galvanized sheet steel of thickness 1.2 mm / optional 1 mm / 1.5 mm / 2mm, according to the design conditions.-as per SMACNA standards.

All joints are welded and sealed for air tight functioning which adds to maintain rigidity.

All welded points are protected by aluminium spray coating.

Both parallel and opposed blade dampers are furnished with concealed control linkage with a manually operated quadrant.

Exposed linkage, a shaft for pneumatic or electric motor operation are optionals.

Pre-punched holes, to the frame for installing the volume control damper to the duct, are optional.

Standard types and models

Type Model Operation Remarks

VCD

‘TO’

‘TA’

‘TNA’

‘TG’

‘TR’

‘TR’-H

‘O’

‘P’

‘O’

‘P’

‘O’

‘P’

‘O’

-

-

VCD galvanized type opposed blade single skin

VCD galvanized type parallel blade with flush formed

VCD aerofoil type parallel blade

VCD aerofoil type opposed blade

VCD aerofoil type opposed blade with flush formed

VCD aerofoil type parallel blade with flush formed

VCD gear wheel type opposed blade only

Round volume control damper; Blade → galvanized sheet steel

Round volume control damper;Blade → perforated sheet of mild steel

1

6

7

8

9

12

VOLUME CONTROL DAMPERS SINGLE SKIN BLADE TYPE VOLUME CONTROL DAMPERS AEROFOIL BLADE TYPE


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NOTE: Doubleskin blade, made of galvanized sheet steel is optional.

NOTE: Double skin blade, made of galvanised sheet steel is optional.

TECNALCO high performance aerofoil control dampers are designed for quiet, efficient and reliable airvolume control.The unique design of an aerofoil blade provides smooth air flow with reduced turbulance.

Minimising the turbulance reduces noise and increases efficiency of air flow.

The double walled construction inherent in an aerofoil blade also increases damper strength.

Aerofoil type construction exhibits better performance characteristic over ordinary type construction.

VCD- TA 'P'

VCD- TA'O'VCD- 'TO'O

VCD- 'TO'P

Tecnalco model VCD-TO O is a Volume Control Damper of single skin type blade made up of GI material with opposed blade operation.

GI single skin blade parallel blade


TECNALCO model VCD-‘TA’O is a volume control damper of aerofoiltype (double skin blade construction made of fixed aluminium aerofoil profiled blades) with opposed blade operation.

TECNALCO model VCD -‘TA’P is a volume control damper of aerofoil type (double skin blade construction made of fixed aluminium aerofoil profiled blades) with parallel blade operation.

TO'P


opposed blade operation. Aerofoil type construction exhibits better performance characteristic

Doubleskin blade, made of galvanized sheet steel is optional.

TECNALCO model VCD-‘TA’O is a volume controlof fixed aluminium aerofoil profiled blades) with opposed blade operation.

TECNALCO model VCD -‘TA’P is a volume control damper of aerofoil type (double skin blade construction made of fixed aluminium aerofoil profiled blades) with parallel blade operation.

VOLUME CONTROL DAMPERS ROUND VOLUME CONTROL DAMPERS


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Parallel blade operation: P

NOTE:

Parallel blades offer rapid air response relative toblade movement but divert air flow to one side ofthe duct.

TECNALCO model VCD-‘TG’O is avolume control damper of aerofoiltype with fixed aluminium aerofoilprofiled blades. The blades arecoupled with high quality PVCgear wheels to get smooth andrattle free opposed blade operation

VCD- ‘TG’O

Opposed blade operation: O

Blade rotation is in the same direction and is bestsuited for on or off applications.

Opposed blades provide non-diverting air flow andreduced turbulance, which is important when thedamper is used in front of fans or coils.Due to opposite blade rotation, opposed bladedampers also require lower opening torque.

In increments of 50 mm are also available in standard sizes.Damper with L or W 1200 is provided with a centre partition.Standard finish is galvanised steel with weld points protected by aluminium spray coating.

Standard SizesModels VCD- TO - O/ TO - P

TA - O/ T - P/ TG - O

150

200

300

400

500

600

700

800

900

1000

1200

100

200

300

400

500

600

L

Any combination of L x W

mm mmW VCD- TR

VCD- TR H

TECNALCO model VCD-‘TR’/‘is a round volume control damper designed to access easily with circularducts of any diameter. The controlling blade is made of galvanised sheet steel.* Thickness of frame = 0.9mm.Optional 1.2mm/1.5mm thickness available.

TECNALCO model VCD-‘TR” H is a round volume control damper designed to access easily with circularducts of any diameter . The controlling blade is made of perforated sheet of mild steel.Standard sizesModels VCD- TR / TR - H

100

150

200

250

300

350

400

450

500

Lmm mm

W

VCD- TR - HVCD- TR - H

TECNALCO models VCD-‘TR’/‘TR’- H are round volume controldampers designed to access easily with circular ducts. In these models the controlling blade is made ofgalvanised sheet steel perforated sheet of mild steel respectively.The adjustable controlling blade ismounted on nylon bushes orbronze bushes with a manuallyoperated quadrant.

VCD- TR

MOTORIZED VOLUME CONTROL DAMPERS

LOW LEAKAGE VCD

TECNALCO

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TECNALCOVOLUME CONTROL DAMPERS VOLUME CONTROL DAMPERS

TECNALCO , Low leakage VCD’s are provided with additional Jam Seals for reducing the leakage between the blades and the frames. These are available in all the models.

Note : Available for box type

TECNALCO , MVCD and MR-VCD models are provided with electrically driven actuator. These are available in all the models. Different models of actuators are used based on the clients requirements.

GI RING

Note:

* GI Rings are available in SS and aluminum finish

* Up to 1.5mm thickness available

GI Circular ring made of galvanized sheet thickness 0.8mm with also avilable on optional.

GI RING

Note:


* Up to 1.5mm thickness available

GI Circular ring made of galvanized sheet thickness 0.8mm with also avilable on optional. GI Circular ring made of galvanized sheet thickness 0.8mm with also avilable on optional.


GI Circular ring made of galvanized sheet thickness 0.8mm with also avilable on optional.

TECNALCO

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ENGINEERING AND PERFORMANCE DATA

Pressure drop co-efficients and resistance factors of multileaf dampers are a function of airspeed and vary in relation to the system’s total pressure available.

The pressure drop is indicated in the graphs for opposed blade dampers and for parallel blade dampers for blade openings of 1/4, 1/2, 3/4 and 4/4 open position.

The values indicated in the graphs can be used for air flow control in composed air handling units and for air flow control in ducting.

The indicated pressure drop value is under a condition that the system’s total pressure permits the indicated air speed over the damper.

Indicated pressure drop is the difference in measured static pressure before and after the damper.

Pressure drop

Leakage:

Maximum pressure drop when closed = 2000 Pa

At D Pt = 500 Pa m3/hr / met2 and Veff. = 7.5 met / sec.

7.5% 3.9% 5.2% 3.1%

VCD- TO VCD- TA VCD- TR VCD- TGOpp/parallel Opp/parallel Opposed

Opposed & parallel blades

Opposed blade damper Parallel blade damper

1000

500400300250

150100

5040302015

10

5

2.50.5 1 2 3 4 5 10 15 20 500.5 1 2 3 4 5 10 15 20 50

4/4 open

3/4 open

1/2 open

P.R.

Dro

p Pa

1/4 open

Velocity m/sec. Velocity m/sec.

4/4 open

3/4 open

P.R.

Dro

p Pa

1/2 open

1/4 open

VOLUME CONTROL DAMPERS CONSTRUCTIONAL DETAILS

Ordinary type construction:

Aerofoil type construction:

Round type construction:

Galvanised sheet steel = 1.2 mm / 1.5 mm thickness

Note: other thickness available on request.

Galvanised sheet steel = 1.0 mm / 1.2 mm thickness.

(or) Aluminium fixed profiled blades = 1.2 mm thickness ( double skin type).

(or) Perforated sheet of mild steel = 0.8 mm thickness

Note: other thickness available on request.

Oil impregnated bronze / nylon bushes

Galvanised steel of TECNALCO make

Steel or aluminium linkage

Galvanised steel manual quadrant with full open and full shut markings

Material construction details:

Frame :

Blades :

Bearings :Shaft :Linkage :

Operation :

Frames and blades are made of galvanised sheet steel in ordinary construction.

B = Blade thickness = 1.0 / 1.2 mm

Finish Standard finish is galvanised sheet steel with weld points protected by aluminium spray coating.

t

Bw

Dw

F t = Frame thickness = 1.2 / 1.5 mm= Blade width = 150 mm / 100 mm= Damper width = 130 mm

B = Blade thickness = 1.2 mmt

Bw

Dw

F t = Frame thickness = 1.2 / 1.5 mm= Blade width = 100 mm / 150 mm= Damper width = 130 mm



of double skin type for aluminium & 0.7 mm for aI blades

Frame is made of galvanised sheet steel of thickness 0.8mm /1 mm / 1.2 mm.The controlling blade is made of galvanised sheet steel of thickness 1 mm. ( or) is made of perforatedsheet of mild steel of thickness 0.8 mm.The movement of the blade permits regulation from full open to full shut off conditions with galvanisedsheet steel blade. And full open to 50% shut off with perforated sheet of mild steel.

Aerofoil type construction is of double skin blades made of aluminium fixed profile or galvanised sheet steel. Frame is made of galvanised sheet steel and blades are made of fixed aluminium aerofoil profiled blades (galvanised sheet steel is optional. Aerofoil blades are constructed by forming two sheets of galvanised sheet steel over a square shaft to give an aerofoil section, which minimizes the effects of turbulance and reduces pressure drop and noise).

Note: More damper width provided on request.

TECNALCO

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Opposed blade dampers

In function of aerodynamic load, the torque co- efficient required to operate the damper blades is indicated in opposite graphic.

The indicated torque ratings are required to overcome the friction of the seals on blade closure.

The indicated torque value is for the total damper with number of blades, as specified.

For selecting the actuator, a safety factor of 25% should be applied to the indicated Nm value.

Parallel blade dampers

The torque value for parallel blade dampers is generally higher than for opposite blade dampers of the same surface and composition.

The indicated torque value is for the total damper with number of blades as specified.

Indicated torque ratings are required to overcome the friction of the seals on blade closure.

Actuator selection will be made with a safety factor of 25% to the indicated values from graph opposite.

The torque values indicated in the graphs are for dampers closed. Anyhow, the blade angle resulting for the largest torque requirement is depending on the fan and distributing system.

10

9

8

7

6

5

4

3

2

1

5 Nm

Ma

4 Nm

3 Nm

2 Nm

1 Nm

0.5 Nm

200 400 600 800 1000 1200 1400

System pressure difference Pa

Num

ber o

f bla

des

in d

ampe

r

6 Nm

Ma

5 Nm

3 Nm

4 Nm

2 Nm

200 400 600 800 1000 1200 1400

System pressure difference Pa

10

9

8

7

6

5

4

3

2

1

Num

ber o

f bla

des


Example:

With uniform duct flowBlade angle = o (0o

90o

Vk

Pt

VkVk

full openfull shut)

K = Pressure drop factorbased on L x W in met/sec.

1. Finding the pressure dropL x W = 1000 x 930 mm

2. Finding the blade angleL x W = 1000 x 390 mmL x W = 1000 x 930 mmV = 10 m3/sec.V = 10 m3/sec.

= 250Pa

= Duct velocity = 10From graph - A K = 1.5From graph - B Pt = 105 Pa

÷0.93 = 10.75 met/sec.

= 200

= Duct velocity = 10

From graph - B K = 3.5From graph - A = 37o

÷0.93 = 10.75 met/sec.

VCD 'TA'P

Easy selection graphs for TECNALCO models VCD-'TO' O/'TO' P/'TA' O/'TA'P/'TG' O

VCD-

TA o

ppos

edVC

D-TA

para

llel

Damper K factor aginst blade angle

Graph A

1000800600400300200

1008060403020

1086432

10.80.60.40.30.2

1000800600400300200

Graph B

Pressure drop as function K & Duct velocity

K = 100 50 25 10 5 2.5 1 0.5

1008060

403020

1086432

11 2 3 4 6 8 10 20 30 40 60 80 100

Duct velocity m/s.

0.10 10 20 30 40 50 60 70 80 90

Blade angle

K PtPa

VOLUME CONTROL DAMPERS FIXING DETAILS

Fixing Details:

Type 'S' fixing:

Screw type fixing

NOTE:

Available finishes:

Ordering Data:

Specify

Example:

1 . 2 . 3 . 4 . 5 . 6 .

Standard supply is Type ‘S’ fixing.

Pre-punched holes to the frame or available onrequest.

Galvanized sheet steel finish frame (Mill finish)

Epoxy primary coated finish.

1. TECNALCO type and model2. Nominal size - L x W3. Quantity4. Type of fixing5. Surface finish6. Remarks

VCD’TA’O 500 x 300 5 nos. Type ‘S’ fixingwith pre-punchedholes

GI finish

TECNALCOCEILING DIFFUSERS

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Documents

Volume Dampers · 2019. 7. 13. · operated quadrant. Exposed linkage, a shaft for pneumatic or electric motor operation are optionals. Pre-punched holes, to the frame for installing