Type ARK2

For the prevention of excess pressure in rooms

Pressure relief dampers for gas fire extinguishing systems and transformer substations

  • Air leakage with back pressure to EN 1751, class 4
  • Maximum differential pressure: 5000 Pa
  • Differential pressure can be adjusted from 50 – 1000 Pa (B > 600 mm: 600 Pa max.)
  • Blades made of aluminium, casing made of galvanised steel
  • Blades open when the maximum differential pressure is exceeded and close automatically when the pressure drops
  • Blade locking with permanent magnet
  • Robust, maintenance-free construction
  • Available in standard sizes and many intermediate sizes
  • Operating temperature 0 to 80 °C


Optional equipment and accessories

  • Installation subframe
  • Powder coating (RAL or DB)
  • Stainless steel construction with stainless steel casing; blades made of aluminium

Pressure relief damper, variant ARK2 00136592_0


  • Application
  • Description

Application

  • Pressure relief dampers of Type ARK2 for the protection of internal spaces from differential pressures in excess of set maximum levels
  • When the set maximum differential pressure is exceeded, the blades automatically open to relieve the excess pressure
  • Pressure peaks will be reliably controlled
  • Differential pressure can be adjusted from 50 – 1000 Pa (B > 600 mm: 600 Pa max.)

Special characteristics

  • Robust, maintenance-free construction
  • Maximum differential pressure: 5000 Pa
  • 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
  • Maintenance-free DU bearings with Teflon coating, bearing shafts made of stainless steel
  • Each blade is locked with a factory set permanent magnet
  • Adjustable differential pressure for blade opening: 50 – 1000 Pa, depending on width

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

Construction

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

Parts and characteristics

  • Ready-to-install pressure relief damper
  • Blades with low-friction bearings
  • One retaining element with a permanent magnet for each blade
  • Seal
  • Travel stop (angle section)

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
  • Adjustable retaining element to adapt to different pressures (factory set as ordered)
  • 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 made of stainless steel, material no. 1.4301
  • Blade shafts made of stainless steel, material no. 1.4104
  • Plate of the retaining element made of steel, material no. 1.0718
  • 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

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

Pressure-relief dampers open and close automatically.

The blades are kept closed by magnets.

If the differential pressure exceeds the set maximum value, the magnetic force is overcome, and the blades open. The airflow by which the excess pressure has been caused can now flow through the damper. The pressure peak is immediately and reliably controlled. The blade opening angle depends on the differential pressure and the volume flow rate.

When the differential pressure drops below approx. 30 Pa, the blades close again.

Nominal sizes

200 × 345 to 1200 × 1995 mm

Volume flow rate range

140 – 4790 l/s or 504 – 17244 m³/h at 50 Pa and 2 m/s

Adjustable differential pressure range

50 – 1000 Pa (B > 600 mm: 600 Pa max.)

Airflow velocity

2 m/s at 50 Pa

Maximum differential pressure in closing direction

5000 Pa

Operating temperature

0 – 80 °C


Geometric free area – ARK2

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

345

0.031

0.085

0.139

0.194

0.248

0.302

675

0.063

0.174

0.284

0.394

0.504

0.614

1005

0.096

0.262

0.428

0.594

0.761

0.927

1335

0.128

0.350

0.572

0.795

1.017

1.239

1665

0.160

0.438

0.717

0.995

1.273

1.552

1995

0.192

0.527

0.861

1.195

1.530

1.864

Intermediate sizes: Intermediate widths can be interpolated


Horizontal airflow 00102966_0


Quick sizing tables provide a good overview of the volume flow rates with 50 Pa differential pressure and an airflow velocity of 2 m/s. Values for intermediate widths can be interpolated.

Sizing example

Given data

Pressure relief damper ARK2/600×1005

Maximum differential pressure 400 Pa

Differential pressure when the blade is open: 50 Pa

Quick sizing

Maximum volume flow rate 1210 l/s (4356 m³/h)

Calculation procedure

A = 0.600 × 1.005 = 0.603 m²

V = v × A = 2.0 × 0.603 (× 1000) = 1206 l/s or 4342 m³/h

Result: Up to 1206 l/s or 4342 m³/h may overflow at 50 Pa

ARK2: 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

140

504

275

990

415

1494

550

1980

690

2484

830

2988

675

270

972

540

1944

810

2916

1080

3888

1350

4860

1620

5832

1005

400

1440

805

2898

1210

4356

1610

5796

2010

7236

2410

8676

1335

535

1926

1070

3852

1600

5760

2140

7704

2670

9612

3200

11520

1665

665

2394

1330

4788

2000

7200

2660

9576

3330

11988

4000

14400

1995

800

2880

1600

5760

2390

8604

3190

11484

3990

14364

4790

17244


Airflow velocity

Δpt v
Pa m/s

35

1

50

2

65

3

80

4

90

5


Rectangular pressure relief dampers for the protection of internal spaces from differential pressures in excess of set maximum levels.

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

Special characteristics

  • Robust, maintenance-free construction
  • Maximum differential pressure: 5000 Pa
  • 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
  • Maintenance-free DU bearings with Teflon coating, bearing shafts made of stainless steel
  • Each blade is locked with a factory set permanent magnet
  • Adjustable differential pressure for blade opening: 50 – 1000 Pa, depending on width

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 made of stainless steel, material no. 1.4301
  • Blade shafts made of stainless steel, material no. 1.4104
  • Plate of the retaining element made of steel, material no. 1.0718
  • 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

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: 140 – 4790 l/s or 504 – 17244 m³/h at 50 Pa, 2 m/s
  • Adjustable differential pressure range: 50 – 1000 Pa (B > 600 mm: 600 Pa max.)
  • Airflow velocity: 2 m/s at 50 Pa
  • Maximum differential pressure: 5000 Pa
  • Operating temperature: 0 to 80 °C

Sizing data

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

00135483_0

 Type
ARK2              Pressure relief damper

 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)

 Maximum differential pressure [Pa]
       Specify value in Pa

 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: ARK2–G/800×1995/100 Pa

Material

Galvanised steel, with aluminium blades

Construction

Flange holes on both sides

Nominal size

800 × 1995 mm

Installation subframe

Without

Maximum differential pressure

100 Pa

Surface

Standard construction


 

Dimensions and weight, Product details

  • Dimensions and weight
  • Product details

  • 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

ARK2: Standard sizes, dimensions

H No. of blades
H No. of blades
mm

345

1

675

2

1005

3

1335

4

1665

5

1995

6


ARK2: Intermediate sizes, dimensions

H No. of blades Y
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


ARK2: Weights

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

345

9

11

13

16

19

22

675

13

17

20

24

28

33

1005

19

24

28

33

38

43

1335

24

30

35

41

47

53

1665

30

37

43

50

57

64

1995

35

43

50

58

66

74


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

  • Installation orientation: Horizontal airflow
  • Only for installation in internal spaces

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

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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.: +60 6 678 8188 | Fax: +60 6 678 8288 (388)