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

Open blade

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

Schematic illustration of ARK2

① Casing
② Blade
③ Seal
④ Retaining element
⑤ Travel stop (angle section)

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	m²
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

Δp_t	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

Δp_zul __________________ [Pa]
V __________________ [m³/h]
Δp_st __________________ [Pa]

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

Accessories

Type Installation subframe

Dimensions and weight, Product details

ARK2 standard sizes

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 into an internal wall, without installation subframe

① Blade movement area must be kept clear

Illustration shows ARK2

Installation and commissioning

Installation orientation: Horizontal airflow
Only for installation in internal spaces

Nomenclature

L_WA [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

Δp_st [Pa]

Static differential pressure

Δp_t [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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