End-of-Line Pressure/Vacuum Conservation Vent and Flame Arrester

FAB Valve® Series

Gas Groups: C & D | IIA & IIB3  

The Protectoseal FAB Valve® Series serves as both a Pressure and Vacuum Conservation Vent and a Deflagration Flame Arrester. The conservation vent provides dependable protection against excessive pressure/vacuum and minimizes vapor loss. The flame arrester provides additional protection against atmospheric deflagration.


  • RE-Flow® technology provides outstanding flow capacity with minimal pressure drop
  • Unique element design is less susceptible to fouling/clogging
  • Optimized pallet design and sealing to reduce chattering
  • Compact design for ease of installation
  • Sizes: 2”(50mm) through 12”(300mm)
  • Connections: ANSI 150 Flange
  • Materials: Stainless Steel (No coating), Carbon Steel (Orange paint)
  • Gas Groups: C & D | IIA & IIB3
  • Testing & Certifications: EN ISO 16852 and approved to ATEX Directive 2014/34/EU.
  • Alternative connections available
  • Additional material available
  • Coatings
    • PTFE
    • Offshore Paint and Coating*
    • Others on Request
  • NACE conformance (all wetted parts)

*Adds a protective layer to the flame arrester. Primarily employed in offshore platform applications.