Type ARK

For heavy duty applications

Non-return dampers prevent unwanted airflows against the intended airflow direction when the system is not in operation

  • Air leakage with back pressure to EN 1751, class 4
  • Maximum differential pressure: 5000 Pa
  • Blades made of aluminium, casing made of galvanised steel
  • Available in standard sizes and many intermediate sizes
  • Variant ARK (with linked blades) for variable volume flows
  • Variant ARK-1 (with adjustable blade restrictors) for constant volume flows
  • Installation in horizontal or vertical ducts


Optional equipment and accessories

  • Installation subframe
  • Powder coating (RAL or DB)
  • Stainless steel construction with stainless steel casing; blades made of aluminium
  • Temperature resistant up to 200 °C with Viton seal

Non-return damper, variant ARK 00136554_0

Non-return damper with linkage

  • Application
  • Description

Application

  • Non-return dampers of Type ARK for the fresh air and exhaust air ducts of air conditioning systems
  • Prevention of unwanted airflows against the intended airflow direction when the system is not in operation
  • Blades close automatically when the system is shut down
  • Maximum differential pressure: 5000 Pa

Special characteristics

  • Robust, maintenance-free construction
  • Maximum differential pressure: 5000 Pa
  • Closed blade air leakage with back pressure, in closing direction, to EN 1751, class 4
  • Damper for negative or positive pressure (air extract or discharge)
  • Operating temperature 0 to 80 °C
  • Optional temperature resistant construction for up to 200 °C, with Viton seal
  • Installation in horizontal or vertical ducts
  • Maintenance-free DU bearings with Teflon coating, bearing shafts made of stainless steel

Nominal sizes

  • B: 200, 400, 600, 800, 1000, 1200 mm (intermediate sizes: 201 – 1199 mm, in increments of 1 mm)
  • H: 345, 675, 1005, 1335, 1665, 1995 mm (intermediate sizes 355 – 505, 685 – 835, 1015 – 1165, 1345 – 1495, 1675 – 1825 mm in increments of 1 mm)
  • Any combination of B × H

Variants

  • ARK: Non-return damper with linked blades, preferably for variable volume flows
  • ARK-1: Non-return damper with adjustable blade restrictors, preferably for constant volume flows

Construction

  • Galvanised sheet steel, duct connection without flange holes
  • A2: Stainless steel
  • G: Duct connection with flange holes

Accessories

  • Installation subframe: Installation subframe for the fast and simple installation of mechanically self-powered dampers

Standards and guidelines

  • Closed blade air leakage (against the intended airflow direction) to EN 1751, class 4
  • Casing air leakage to EN 1751, class C

Maintenance

  • Maintenance-free as construction and materials are not subject to wear
  • Contamination should be removed as it may lead to corrosion and to increased closed blade air leakage

Technical information

Function, Technical data, Quick sizing, Specification text, Order code, Related products

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code
  • Related products

Functional description

Non-return dampers open and close automatically.

When the system is in operation, the blades open when air flows. The blade opening angle depends on the differential pressure and the volume flow rate; for variant ARK-1 the opening angle is limited by adjustable blade restrictors.

When the system is shut down, the blades close due to their weight. They safely prevent air from flowing against the intended airflow direction.

Nominal sizes

200 × 345 to 1200 × 1995 mm

Volume flow rate range

690 – 23950 l/s or 2484 – 86220 m³/h at 10 m/s

Total differential pressure (horizontal airflow)

115 Pa at 10 m/s

Total differential pressure (vertical airflow)

45 Pa at 10 m/s

Maximum differential pressure in closing direction

5000 Pa

Operating temperature

0 – 80 °C


Geometric free area – ARK

H B [mm]
H 200 400 600 800 1000 1200
mm

345

0.043

0.097

0.152

0.206

0.260

0.314

675

0.088

0.198

0.309

0.419

0.529

0.639

1005

0.133

0.299

0.466

0.632

0.798

0.964

1335

0.178

0.400

0.622

0.845

1.067

1.289

1665

0.223

0.501

0.779

1.058

1.336

1.614

1995

0.268

0.602

0.936

1.271

1.605

1.940

Intermediate sizes: Intermediate widths can be interpolated


Quick sizing tables provide a good overview of the volume flow rates with an airflow velocity of 10 m/s. Values for intermediate widths can be interpolated.

ARK: Maximum volume flow rate

H B [mm]
H 200 400 600 800 1000 1200
mm l/s m³/h l/s m³/h l/s m³/h l/s m³/h l/s m³/h l/s m³/h

345

690

2484

1380

4968

2070

7452

2760

9936

3450

12420

4140

14904

675

1350

4860

2700

9720

4050

14580

5400

19440

6760

24336

8100

29160

1005

2010

7236

4020

14472

6040

21744

8040

28944

10050

36180

12050

43380

1335

2670

9612

5340

19224

8020

28872

10700

38520

13350

48060

16000

57600

1665

3330

11988

6660

23976

10000

36000

13300

47880

16650

59940

20000

72000

1995

3990

14364

7980

28728

11950

43020

15950

57420

19950

71820

23950

86220


Differential pressure

v Airflow
v horizontal vertical
v Δpst
m/s Pa

2

50

135

4

75

125

6

95

105

8

110

65

10

115

45


Rectangular non-return dampers to prevent air from flowing against the intended airflow direction through fresh air and exhaust air ducts of air conditioning systems.

Ready-to-install component which consists of a casing, blades with low-friction bearings, and travel stop and sealing parts.

Special characteristics

  • Robust, maintenance-free construction
  • Maximum differential pressure: 5000 Pa
  • Closed blade air leakage with back pressure, in closing direction, to EN 1751, class 4
  • Damper for negative or positive pressure (air extract or discharge)
  • Operating temperature 0 to 80 °C
  • Optional temperature resistant construction for up to 200 °C, with Viton seal
  • Installation in horizontal or vertical ducts
  • Maintenance-free DU bearings with Teflon coating, bearing shafts made of stainless steel

Construction

  • Galvanised sheet steel, duct connection without flange holes
  • A2: Stainless steel
  • G: Duct connection with flange holes

Technical data

  • Nominal sizes: 200 × 345 to 1200 × 1995 mm
  • Volume flow rate range: 690 – 23950 l/s or 2484 – 86220 m³/h at 10 m/s
  • Total differential pressure (horizontal airflow): 115 Pa at 10 m/s
  • Total differential pressure (vertical airflow): 45 Pa at 10 m/s
  • Maximum differential pressure in closing direction: 5000 Pa
  • Operating temperature: 0 to 80 °C
  • Maximum pressure: 5000 Pa

Sizing data

  • V __________________ [m³/h]
  • Δpst __________________ [Pa]

Air-regenerated noise

  • LWA __________________ [dB(A)]

00102959_0

 Type
ARK       Non-return damper

 Blade mechanism
       No entry: linked blades
1       Blades with adjustable restrictors

 Material
       No entry: galvanised steel,
       with aluminium blades
A2       Stainless steel with aluminium blades

 Construction
       No entry: duct connection without flange holes
G       Duct connection with flange holes

 

 Nominal size [mm]
       B × H

 Installation subframe
       No entry: none
ER       With (only for construction G)

 Surface
       No entry: standard construction
P1       Powder-coated,        RAL CLASSIC colour
PS       Powder-coated, DB colour

       Gloss level
       RAL 9010 50 %
       RAL 9006 30 %
       All other RAL colours 70 %

Order example: ARK–1–A2/1000×1995/P1–RAL 7001

Blade mechanism

Blades with adjustable restrictors

Material

Stainless steel, with aluminium blades

Construction

Without holes

Nominal size

1000 × 1995 mm

Installation subframe

Without

Surface

Powder-coated, RAL 7001, silver grey


 

Variants, Dimensions and weight, Product details

  • Variants
  • Dimensions and weight
  • Product details

ARK

Variant

  • Non-return damper with linked blades, preferably for variable volume flows

Nominal sizes

  • B: 200, 400, 600, 800, 1000, 1200 mm (intermediate sizes: 201 – 1199 mm, in increments of 1 mm)
  • H: 345, 675, 1005, 1335, 1665, 1995 mm (intermediate sizes 355 – 505, 685 – 835, 1015 – 1165, 1345 – 1495, 1675 – 1825 mm in increments of 1 mm)
  • Any combination of B × H

Parts and characteristics

  • Ready-to-install non-return damper
  • Blades with low-friction bearings
  • Seal
  • Travel stop (angle section)
  • Linkage

Construction features

  • Rectangular casing, material thickness 2 mm
  • Blades, material thickness 3 mm
  • Flanges on both sides, suitable for duct connection, with or without flange holes
  • Linkage for synchronous blade movement
  • Blades with perimeter seal, pressed against travel stop (angle section) when closed
  • Blade shafts with maintenance-free metal-polymer bearings

Materials and surfaces

  • Casing and travel stop (angle section) made of galvanised sheet steel, material no. EN 10327-DX51D+Z150-200-NAC
  • A2 construction: Casing and travel stop (angle section) made of stainless steel, material no. 1.4301
  • Blades and linkage made of aluminium, material no. AlMg3
  • Blade holders made of stainless steel, material no. 1.4301
  • Blade shafts made of stainless steel, material no. 1.4104
  • Blade bearings made of metal-polymer composite, with an antifriction lining of PTEE/Pb
  • Neoprene seals
  • P1: Powder-coated, RAL CLASSIC colour
  • PS: Powder-coated, DB colour

ARK-1

Variant

  • Non-return damper with adjustable blade restrictors, preferably for constant volume flows

Nominal sizes

  • B: 200, 400, 600, 800, 1000, 1200 mm (intermediate sizes: 201 – 1199 mm, in increments of 1 mm)
  • H: 345, 675, 1005, 1335, 1665, 1995 mm (intermediate sizes 355 – 505, 685 – 835, 1015 – 1165, 1345 – 1495, 1675 – 1825 mm in increments of 1 mm)
  • Any combination of B × H

Parts and characteristics

  • Ready-to-install non-return damper
  • Blades with low-friction bearings
  • Seal
  • Travel stop (angle section)
  • Two adjustable restrictors per blade

Construction features

  • Rectangular casing, material thickness 2 mm
  • Blades, material thickness 3 mm
  • Flanges on both sides, suitable for duct connection, with or without flange holes
  • Restrictors, adjustable from the outside, to limit the opening angle for each blade
  • Blades can be moved independent of complementary to one another
  • Blades with perimeter seal, pressed against travel stop (angle section) when closed
  • Blade shafts with maintenance-free metal-polymer bearings

Materials and surfaces

  • Casing and travel stop (angle section) made of galvanised sheet steel, material no. EN 10327-DX51D+Z150-200-NAC
  • A2 construction: Casing and travel stop (angle section) made of stainless steel, material no. 1.4301
  • Blades made of aluminium, material no. AlMg3
  • Blade holders and restrictors made of stainless steel, material no. 1.4301
  • Blade shafts made of stainless steel, material no. 1.4104
  • Blade bearings made of metal-polymer composite, with an antifriction lining of PTEE/Pb
  • Neoprene seals
  • P1: Powder-coated, RAL CLASSIC colour
  • PS: Powder-coated, DB colour

  • B: 200 – 1200 mm, intermediate sizes 201 – 1199 in increments of 1 mm
  • H: 345 – 1995 mm, intermediate sizes 355 – 505, 685 – 835, 1015 – 1165, 1345 – 1495, 1675 – 1825 mm in increments of 1 mm
  • The weight for the next larger size applies

Flow cross section to calculate the airflow velocity

  • A = B × H

Unit of measure for B and H: m

ARK: Standard sizes, dimensions

H No. of blades No. of coupling rods
mm

345

1

0

675

2

1

1005

3

1

1335

4

2

1665

5

2

1995

6

2


ARK: Intermediate sizes, dimensions

H No. of blades No. of coupling rods Y
mm mm

355 – 505

1

0

5 – 80

685 – 835

2

1

5 – 80

1015 – 1165

3

1

5 – 80

1345 – 1495

4

2

5 – 80

1675 – 1825

5

2

5 – 80


ARK-1: Standard sizes, dimensions

H No. of blades
mm

345

1

675

2

1005

3

1335

4

1665

5

1995

6


ARK-1: Intermediate sizes, dimensions

H No. of blades Y
mm mm

355 – 505

1

5 – 80

685 – 835

2

5 – 80

1015 – 1165

3

5 – 80

1345 – 1495

4

5 – 80

1675 – 1825

5

5 – 80


ARK, ARK-1: Weights

H B [mm]
H 200 400 600 800 1000 1200
mm kg

345

8

10

12

15

18

21

675

12

16

19

23

27

32

1005

17

22

26

31

36

41

1335

22

28

33

39

45

51

1665

27

34

40

47

54

61

1995

32

40

47

55

63

71


Flange holes – ARK, ARK-1, ARK2 00146064_0
① Even number of holes (hole pitch = 250 mm)
② Uneven number of holes (hole pitch = 250 mm)


ARK, ARK-1, ARK2: width, no. of flange holes

B No. of holes
B n
mm

200 – 287

1

288 – 537

2

538 – 787

3

788 – 1037

4

1038 – 1200

5


ARK, ARK-1, ARK2: height, no. of flange holes

H No. of holes
H n
mm

345 – 461

2

462 – 711

3

712 – 961

4

962 – 1211

5

1212 – 1461

6

1462 – 1711

7

1712 – 1961

8

1962 – 1995

9


Installation details, Basic information and nomenclature

  • Installation details
  • Basic information and nomenclature

Installation and commissioning

ARK

  • Installation orientation: Horizontal airflow, any airflow direction; or vertical airflow with airflow from bottom to top
  • Only for installation in internal spaces


ARK-1

  • Installation orientation: Horizontal airflow, any airflow direction; or vertical airflow with airflow from bottom to top
  • Only for installation in internal spaces
  • Adjusting the restrictors to limit the opening angle for each blade

Nomenclature

LWA [dB(A)]

A-weighted sound power level of air-regenerated noise for the mechanically self-powered damper

A [m²]

Upstream cross section

v [m/s]

Airflow velocity based on the upstream cross section

V [m³/h] and [l/s]

Volume flow rate

Δpst [Pa]

Static differential pressure

Δpt [Pa]

Total differential pressure


All sound power levels are based on 1 pW.

Principal dimensions

B [mm]

Duct width

H [mm]

Duct height

n [ ]

Number of flange screw holes

m [kg]

Weight

Share page

Recommend this page

Recommend this page by sending a link by mail.

Fields marked with an (*) are required fields.

Share page

Thank you for your recommendation!

Your recommendation has been sent and should arrive shortly.


Contact

We are here for you

Visual contact Visual contact

Please specify your message and type of request.
Tel.: +91 (0) 22 6775-1600 | Fax: +91 (0) 226775-1613

Fields marked with an (*) are required fields.

Contact

Thank you for your message!

Visual contact Visual contact

Your message is send and will be processed shortly.
Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +91 (0) 22 6775-1600 | Fax: +91 (0) 226775-1613

Contact

We are here for you

Visual contact Visual contact

Please specify your message and type of request.
Tel.: +91 (0) 22 6775-1600 | Fax: +91 (0) 226775-1613

Attachment (max. 10MB)

Fields marked with an (*) are required fields.

Contact

Thank you for your message!

Visual contact Visual contact

Your message is send and will be processed shortly.
Our department for Service-Requests will contact you asap.
For general question regarding products or services you can also call:
Tel.: +91 (0) 22 6775-1600 | Fax: +91 (0) 226775-1613