Flashback Arrestor 623N/NU

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For Fuel Gases – (not Acetylene)

Max. flow: 460m3/h

Max. Working Pressures:

LPG – 2 bar

Natural Gas, Methane – 3 bar

Hydrogen – 1.5 bar

Flame arrestor

Non-return valve

Temperature sensitive cut-off valve

Item #: 1117
Quantity Available: 100

100 in stock


WITT Flashback Arrestors for reliable protection against dangerous reverse gas flow and flashbacks in accordacne with DIN EN ISO 5175-1. Every Arrestor 100% tested.

The best Flashback Arrestors in the world

  • a large surface area flame arrestor FA of stainless steel construction extinguishes any dangerous flashback entering the device in any direction
  • a temperature-sensitive cut-off valve TV extinguishes sustained flashbacks long before the internal temperature of the arrestors reaches a dangerous level
  • a spring-loaded check valve NV prevents slow or sudden reverse gas flow forming explosive mixtures in the gas supply

Operation / Usage:

  • Flashback Arrestors are used to protect gas cylinders and pipeline outlet points (hoses and any equipment)
  • also in thermal processing systems against dangerous reverse gas flow and flashbacks
  • WITT Flashback Arrestors may be mounted in any position /orientation
  • the maximum ambient / working temperature is 70 °C / 158 °F


  • annual testing of the check valve, body leak tightness and flow capacity is recommended
  • WITT is happy to supply special test equipment
  • Flashback Arrestors are only to be serviced by the manufacturer

Company certified to ISO 9001 and PED 97/23/EC Module H
CE-marked in accordance with PED 97/23/EC


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