Flame Control Equipment Click on desired biogas equipment to view features, specs, options and download documents. 8800 Pressure-Vacuum Valve & Flame Arrester 8820A Pressure – Vacuum Valve & Flame Arrester (pipe-away) 7622 Flame Check 8500 Flame Trap Assembly 8400 Pressure Relief & Flame Trap Assembly 7618 Biogas Flame Arrester, Vertical Installation 7628 Biogas Flame Arrester, Horizontal Installation