The Betts’ Guardian^TM combination valve is a spring loaded reclosing pressure and vacuum relief device for use on a cargo tank’s primary pressure relief and vacuum relief systems. The combination relief valve is designed, tested and marked in accordance with 49CFR §178.345-10, 49CFR §178.347-4 and 49CFR §178.348-4.

• Compact, optimized flow design.
• 316 Stainless Steel construction.
• Teflon seals and wear components.
• Safety Stop Screw to help prevent accidental unthreading of housing.
• Seal tabs on shroud for security measures.
• Simple In-Place Maintenance.
• Available ECTFE (Halar®) coated.
• Multiple sizes and mounting options.
• Multiple seal options.
• Vibration damping vacuum vent.
• 4″ TTMA flange connection has eight 3/8-16 UNC X .65 deep blind holes.