SNR non-return damper
The SNR non-return damper is a simple and cost-effective solution for isolation of an explosion origin by closing the ductwork and preventing further propagation of explosion to the remainder of the protected installation.
- Application: organic dust; metallic dust
- System internal ATEX zone: Zone 20, 21 and 22
- System external ATEX zone: Zone 21, 22
- Max. reduced explosion isolation pressure, Pred: 0.5 bar
- Max. Kst: 400 bar×m/s
- Max. operating pressure: 50,000 Pa
- Maximum air flow velocity: 30 m/s
- Min. installation distance from potential explosion origin:
- 1 m for dust with Kst < 200 bar m/s; 1 m for dust with Kst; 200 bar m/s;
- Max. installation distance from potential explosion origin: 2-3 m
- Material(s):
- Carbon steel, gauge 30/10 or 40/10
- AISI 304 grade stainless steel
- System pressure drop
- ≤ Ø 400: 10 mm H2O
- ≤ Ø 700: 16 mm H20
Optional accessories available on request:
- Open damper lock: engaged following an explosion trigger;
- Closed damper position sensor;
- Damper lock capacitative sensor: triggered by the flow of product.
The non-return dampers require a horizontal orientation and installation in line with a straight ductwork run. The ductwork diameter must be equal to that of both non-return damper ports.
| MODEL | MAX KST | A | B | C | D | E | F | G | H |
|---|---|---|---|---|---|---|---|---|---|
| SNR 160 | CLASS 3 - 400 [BAR M/S] | 360 | 340 | 550 | 340 | 300 | 180 | 170 | - |
| SNR 180 | CLASS 3 - 400 [BAR M/S] | 360 | 340 | 550 | 340 | 300 | 180 | 170 | - |
| SNR 200 | CLASS 3 - 400 [BAR M/S] | 360 | 340 | 550 | 340 | 300 | 180 | 170 | - |
| SNR 250 | CLASS 3 - 400 [BAR M/S] | 410 | 390 | 600 | 390 | 325 | 205 | 195 | - |
| SNR 300 | CLASS 3 - 400 [BAR M/S] | 460 | 440 | 670 | 600 | 350 | 230 | 220 | - |
| SNR 350 | CLASS 3 - 400 [BAR M/S] | 510 | 490 | 720 | 650 | 375 | 255 | 245 | - |
| SNR 400 | CLASS 3 - 400 [BAR M/S] | 560 | 590 | 770 | 750 | 400 | 280 | 270 | 350 |
| SNR 450 | CLASS 3 - 400 [BAR M/S] | 610 | 640 | 820 | 845 | 425 | 305 | 295 | 400 |
| SNR 500 | CLASS 3 - 400 [BAR M/S] | 660 | 690 | 870 | 985 | 450 | 330 | 320 | 460 |
| SNR 550 | CLASS 3 - 400 [BAR M/S] | 710 | 740 | 920 | 950 | 475 | 355 | 345 | 500 |
| SNR 600 | CLASS 3 - 400 [BAR M/S] | 760 | 790 | 970 | 1045 | 500 | 380 | 370 | 550 |
| SNR 650 | CLASS 3 - 400 [BAR M/S] | 810 | 840 | 1020 | 1145 | 525 | 405 | 395 | 605 |
| SNR 700 | CLASS 3 - 400 [BAR M/S] | 860 | 890 | 1070 | 1195 | 550 | 430 | 420 | 650 |
