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IEP Technologies / Hoerbiger – Flameless Explosion Vent – Explosion Relief Valve EVN 2.0 & EVN 3.0

Explosion Relief Valve EVN

The IEP Hoerbiger EVN 2.0 and 3.0 valves are revolutionary explosion relief valves and flameless explosion vents with a low-mass valve plate and low response pressure. This flameless vent reacts within fractions of a second in the event of an explosion. Following an explosion, it immediately seals again manually or automatically, lowering the risk of secondary explosions and costly replacement.

EVN

Special features of Hoerbiger explosion relief valves:

  • No flame escape
  • No air inrush thanks to quick reclosing
  • Absolute tight after reclosing
  • Operable in all mounting positions
  • Easy to install
  • Virtually maintenance-free

The standard range features an opening pressure of 0.05 bar ± 20%.
Standard range components are made of carbon steel, coated. Special materials are available on request.

Each valve is equipped with an opening detection as standard.

For specific efficiency values (%EF) mandatory for correct sizing of the necessary relief area please contact CMC Technologies Pty Ltd.

EVN in Process

EVN in a process

IEP-Hoerbiger EVN 2.0

Evn2.0
Evn2.0

The Hoerbiger EVN 2.0 is certified according to EN 16009

Type Geometric relief area [cm²] Dimensions Connection Approx weight
[kg]
a
[mm]
b
[mm]
c
[mm]
d
[mm]
e
[mm]
No.
of bolts
h
Thread
k
P.C.D.
[mm]
266EVN 2.0 499 457 252 409 114 134 6 M12  or 1/2″ 302 29
320EVN 2.0 732 510 305 462 121 142 6 M12  or 1/2″ 355 37
420EVN 2.0 1260 625 400 579 150 165 8 M16 or 5/8″ 465 65
480EVN 2.0 1665 690 460 644 168 201 8 M16 or 5/8″ 530 80
565EVN 2.0 2300 790 541 735 197 228 12 M16 or 5/8″ 615 115
645EVN 2.0 2990 955 617 899 202 233 12 M16 or 5/8″ 700 160
735EVN 2.0 3905 970 705 910 222 260 12 M16 or 5/8″ 795 200

IEP-Hoerbiger EVN 3.0

evn3.0h
evn3.0h-nc

Effective venting relief area given in the EVN 3.0 Product Manual

Type Geom. Relief Area* Dimensions Approx weight
cm²/in² A mm (in) B mm (in) C mm (in) D mm (in) kg/lb
266EVN3.0 499/78 126 (4.96) 442.2 (17.5) 268.6 (10.57) 409 (16.1) 24/53
320EVN3.0 732/114 132 (5.2) 510 (20.08) 321.5 (12.66) 462 (18.19) 30/66
420EVN3.0 1260/195 156.5 (6.16) 625 (24.6) 416.6 (16.4) 579 (22.8) 50/110
480EVN3.0 1665/258 192.5 (7.58) 690 (27.17) 476.6 (18.76) 644 (25.35) 64/141
565EVN3.0 2300/365 213 (8.39) 790 (31.1) 562.2 (22.13) 735 (28.94) 97/214
645EVN3.0 2990/450 218 (8.58) 961 (37.83) 637.7 (25.11) 899 (35.39 128/282
735EVN3.0 3905/605 251 (9.88) 961 (9.88) 727.7 (28.65) 910 (35.83) 137/302

The EVN 3.0H is an automatic reclosing, flameless explosion venting device. In case of an overpressure event (i.e a dust explosion), the valve opens and as soon the pressure falls back below the opening pressure of the valve, the valve plate closes immediately. Here are some of the features/benefits of this model

Flameless vent Type EVN3.0H- (Hygenic)

  • Size, design, certification
  • Field of application: reclosing flameless vent for hygienic applications
  • Design: round valve with integrated flame arrester and counter flange gasket
  • Material: carbon steel and stainless available
  • Available size: 266 up to 735
  • Type approval acc. to EN16009 similar to EVN2.0\
  • Kst < 300bar.m/s
  • Min. ignition energy < 2mJ
  • Fibrous, melting, organic, organic synthetic dusts
  • Pstat 0,05bar
  • Efficiency 52-75% (pred 0,2-2,0bar)
  • Max Volume 6,0m³ for 1pcs 735EVN3.0H
  • Full vacuum

Differences between the EVN2.0 and the EVN3.0H

  • Valve seat is not in contact with the process material
  • Food grade flush profiled gasket (no gaps) – The gap-free installation allows for easy CIP cleaning of the process equipment.
  • Integrated counter flange gasket
  • Reduction of overall weight

NEW – Type EVN 3.0H NC

The EVN 3.0H NC is a manual re-closing flameless explosion venting device. In case of an overpressure event (i.e., a dust explosion), the valve opens and remains open until the valve plate is released manually by hand. This type of valve can be used in combination with flap valves as an explosion isolation barrier that has been tested acc. to EN16447-“Alternative testing procedure”. The chamfered shape and gap-free construction of the valve inlet prevent sedimentary product deposits. This construction allows for CIP cleaning inside the protected vessel.

Dust properties

The HOERBIGER Explosion Relief Valves type EVN 3.0H and EVN 3.0H NC were tested for the following dust groups according to EN 16009:

  • Starches
  • Plastics, resins, toners, sugar (melting dusts)
  • Wood, MDF, flock, cellulose (fibrous dusts)
  • Coal and peat
  • For all above-mentioned dust groups, the following limits have to be maintained:
  • Kst max 300 bar.m / s
  • Pred(max) max. 2,0 bar overpressure
  • Operating pressure 0,2-1,0 bar absolute pressure
    Note: During normal operation the opening pressure of the valve must not be exceeded. This would lead to an unintended opening of the valve.
  • Static opening pressure pstat =0,05bar +/- 20%
    Note: The HOERBIGER Relief valves Type EVN3.0H and EVN 3.0H NC were not tested for the use with metallic dusts.