Pressure relief dampers for gas fire extinguishing systems and transformer substations
Optional equipment and accessories
Application
Special characteristics
Nominal sizes
Construction
Parts and characteristics
Construction features
Materials and surfaces
Standards and guidelines
Maintenance
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
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
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
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
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
Materials and surfaces
Construction
Technical data
Sizing data
|
|
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
Flow cross section to calculate the airflow velocity
Unit of measure for B and H: m
ARK2: Standard sizes, dimensions
345 | 1 |
675 | 2 |
1005 | 3 |
1335 | 4 |
1665 | 5 |
1995 | 6 |
ARK2: Intermediate sizes, dimensions
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
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 |
ARK, ARK-1, ARK2: width, no. of flange holes
200 – 287 | 1 |
288 – 537 | 2 |
538 – 787 | 3 |
788 – 1037 | 4 |
1038 – 1200 | 5 |
ARK, ARK-1, ARK2: height, no. of flange holes
345 – 461 | 2 |
462 – 711 | 3 |
712 – 961 | 4 |
962 – 1211 | 5 |
1212 – 1461 | 6 |
1462 – 1711 | 7 |
1712 – 1961 | 8 |
1962 – 1995 | 9 |
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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Siamo qui per te
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Tel.: +41 26 425 59 00 | Fax: +41 55 250 73 10 | Fax Fribourg: +41 26 425 59 01
Contatti
Grazie per il tuo messaggio!
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Il nostro dipartimento per la gestione delle richieste ti contatterà appena possibile.
Per domande di carattere generale riguardanti i nostri prodotti o servizi, è possibile contattare:
Tel.: +41 26 425 59 00 | Fax: +41 55 250 73 10 | Fax Fribourg: +41 26 425 59 01