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.

Grupa WOLFF
BARTOSZ - I am at your disposal

We will answer questions about: offer, technical specification, delivery, assembly.
  • 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.

SNR non-return damper
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

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Grupa WOLFF
BARTOSZ - I am at your disposal

We will answer questions about: offer, technical specification, delivery, assembly.

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