End-of-Line Conservation Vent and Flame Arrester


Gas Groups: D | IIA

Protectoseal Series 830, Pressure / Vacuum Conservation Vent with Flame Arrester is designed to prevent costly evaporation losses, tank rupture due to over-pressure, and collapse due to vacuum. The flame arrester protects tank against fire and explosion caused by exterior sources of ignition. Pallets in the vent housing minimize air and vapor loss as the tank “breathes”. They open and close just enough to maintain safe working pressures and avoid damage to the tank. The flame arrester element is mounted externally and is only exposed to vapors when venting.


  • Certified flow curves validating flow characteristics of unit
  • Certified test report verifying specified settings and leakage performance
  • “Air-cushion” pallet design for low leakage performance of no more than 1 SCFH at 90% of the set pressure
  • Removable and interchangeable element(s) facilitates inspection and maintenance
  • Swing-bolt design permits easy access to arrester element
  • Unit and associated weights serialized for ease in identification
  • Automatic condensate drainage design to mitigate freezing, binding and clogging
  • Sizes: 2” (DN 50) through 10” (DN 250)
  • Connections: FNPT, ANSI and DIN PN 16)
  • Materials: Aluminum, Ductile Iron and Stainless Steel
  • Gas Groups: NEC Group D | IEC Explosion Group IIA
  • Testing & Certifications: FM Approved in 2”, 3” & 4”; UL Listed in 6”, 8” & 10”. For arresters that conform to the latest ATEX Directive, ISO 16852 refer to Series 830E
  • Standard Setting Range*:  Pressure: 0.5 – 29.4 oz/in2 | 2.15 – 128.7 mbar
  • Standard Setting Range*:  Vacuum:  0.5 – 9.2 oz/in2   | 2.15 – 39.6  mbar

*Setting vary by size 

  • Diaphragm Materials: FEP, Viton®, Buna N, EPDM and Neoprene; other materials available upon request
  • Settings: Non-standard setting available
  • Materials certifications for castings


Viton® is a Registered Trademark of E. I. DuPont de Nemours & Co., Inc.