Safety Group 645/85-30 stainless steel

Safety Group 645/85-30 stainless steel

Parallel connection of 4 stainless steel flashback arrestors 85-30 according to EN 730-1 / ISO 5175 for high flow rates

  • highest quality from the world market leader
  • safety elements: flame arrestor [FA], temperature-sensitive cut-off valve [TV], check valve [NV]
  • every arrestor 100% tested
  • also ideal for use with corrosive gases
  • 11.12 X 16.77 inches, 1,760 oz (2X), 2,120 oz (4X)
  • acetylene max. 13,837 scfh (free flow-off)
  • fuel gases max. 96,717 scfh (free flow-off)
  • oxygen max. 65,302 scfh (free flow-off)

Product of WITT 



WITT Safety groups for reliable protection against dangerous reverse gas flow and flashbacks in accordance with EN 730-1 / ISO 5175. For applications with high flow rates. Every safety group 100% tested.


  • 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:

  • in central gas supplies (behind the manifold pressure regulator or in a pipeline system)
  • in thermal processing systems conforming to EN 746-2 (cutting machines, furnace supply equipment)
  • WITT safety groups may be mounted in any position/orientation in pipelines/supply pipes
  • the maximum ambient/working temperature is 70 °C / 158 °F


  • annual testing of the check valve, body leak tightness and flow capacity is recommended
  • safety groups are only to be serviced by the manufacturer


  • connection: two-sided female thread (G-; NPT-; RC-thread)

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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Safety Group 645/85-30 stainless steel