Safety Group 645/623N

Parallel connection of 4 or 5 Flashback Arrestors model 623N
WITT Safety groups for reliable protection against dangerous reverse gas flow and flashbacks according to DIN EN ISO 5175-1. For applications with high flow rates. Every safety group 100% tested.

Benefits:

• 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 60 °C / 140 °F

Maintenance:

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

Options:

• flange end connections (nominal diameter 32 - 65)
• connection: two-sided female thread (G-; NPT-thread; Rc-thread)

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