ARK2

Pressure relief damper, variant ARK2

Closed blade

Open blade

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
The 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

General information

Application

Pressure relief dampers for the protection of internal spaces from differential pressures higher than 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
The differential pressure can be adjusted from 50 – 1000 Pa (B > 600 mm: 600 Pa max.)

Special features

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 various 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 plastic bearings

Materials and surfaces

Casing and travel stop (angle section) made of galvanised sheet steel, material no. EN 10346-DX51D+Z140-200
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
PPS bearings
Neoprene seals
P1: Powder-coated, RAL CLASSIC colour
PS: Powder-coated, DB colour

Standards and guidelines

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

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

Description

Construction

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

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 various 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 plastic bearings

Materials and surfaces

Casing and travel stop (angle section) made of galvanised sheet steel, material no. EN 10346-DX51D+Z140-200
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
PPS bearings
Neoprene seals
P1: Powder-coated, RAL CLASSIC colour
PS: Powder-coated, DB colour

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

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

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)

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 – 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 permissible differential pressure in closing direction	5000 Pa
Operating temperature	0 to 80 °C

Geometric free area – ARK2 [m²]

H	B
H	200	400	600	800	1000	1200
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	0.35	0.572	0.795	1.017	1.239
1665	0.16	0.438	0.717	0.995	1.273	1.552
1995	0.192	0.527	0.861	1.195	1.53	1.864

Intermediate sizes: Intermediate widths can be interpolated

Horizontal airflow

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. Precise intermediate values can be calculated with our Easy Product Finder design program.

Volume flow rate

H	B
	200		400		600		800		1000		1200
	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 [Pa]	v [m/s]
35	1
50	2
65	3
80	4
90	5

Specification text

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

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

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

Casing air leakage to EN 1751, class C.

Special features

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 10346-DX51D+Z140-200
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
PPS bearings
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_sup [Pa]
q_v (m³/h)
Δp_st [Pa]

ARK2

–

600 × 1005

… Pa

P1-RAL

1 TypeARK2 Pressure relief damper 2 MaterialNo entry: galvanised steel with aluminium bladesA2 Stainless steel with aluminium blades 3 Construction No entry: duct connection without flange holesG Duct connection with flange holes 4 Nominal size [mm] B × H 5 Installation subframeNo entry: NoneER With (only for construction G) 6 Maximum differential pressure [Pa] Specify value in [Pa] 7 Surface No entry: standard constructionP1 Powder-coated, specify RAL CLASSIC colourPS Powder-coated, specify DB colour Gloss levelRAL 9010 GU50RAL 9006 GU30All other RAL colours GU70

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, 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

H	No. of blades
345	1
675	2
1005	3
1335	4
1665	5
1995	6

ARK2: Intermediate sizes

H	No. of blades	Y
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, kg

H	B
H	200	400	600	800	1000	1200
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 – ARK2

① Even number of holes (hole pitch = 250 mm)

② Uneven number of holes (hole pitch = 250 mm)

ARK2, width, no. of flange holes

B	No. of holes n
200 – 287	1
288 – 537	2
538 – 787	3
788 – 1037	4
1038 – 1200	5

ARK2, height, no. of flange holes

H	No. of holes n
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 and commissioning

Installation orientation: Horizontal airflow
Only for installation in internal spaces
Type ARK2 pressure relief dampers are not suitable for air conditioning systems (to protect ducts, for example) because vibration, turbulence and deviations would adversely affect the opening pressure set for the damper.
To avoid malfunctions, any disturbing effects should be kept to a minimum, and there should be a sufficient difference between the accepted maximum differential pressure and the 'normal' system pressure.

Note

Deviations:

The actual system conditions cannot be considered at the time of the factory setting which is why pressure deviations might occur on site.
Temperature fluctuations (within the accepted temperature range) have influences on the holding torque of the retaining element, which can lead to deviations from the set opening pressure

Downloads

informazioni di prodotto

Product data sheet Type ARK2

Product data sheet 6.2 MB pdf

certificati

Non-CE Manufacturer's statement ARK2

ARK2_NotCE_2022_02_08_14_43_15_DE_en Certificate 2 MB pdf

manuali d'uso

Installation manual

2018/11/A00000053073 Installation manual 360 KB pdf

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FOR THE PREVENTION OF EXCESS PRESSURE IN ROOMS

General information

Description

Technical information

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

Dimensions, Product details

Downloads

informazioni di prodotto

Product data sheet Type ARK2

certificati

Non-CE Manufacturer's statement ARK2

manuali d'uso

Installation manual

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