4″ DOT406 Pressure Relief Device

Betts 4″ surge pressure relief valve (PRV) satisfies primary and supplemental pressure relief for specification US DOT406 and TC406 cargo tanks. The PRV meets the dynamic pressure surge requirements of 49CFR§178.345-10(b)(3)(ii) with less than one liter leakage as tested per TTMA RP No. 81. The 4″ PRV is ideal for use on small cargo tanks (< 400 gallons) where a 16″ or 20″ manhole is not feasible.  Set pressure is designed for use on a cargo tank with a 3.3 MAWP.

Stainless Vent
Part Number: RVP4FV-3.3
     Material: 316 Stainless Steel with FKM Type A seals.

Aluminum Vents
Part Number: RVPE4FB-3.3
     Material: Aluminum E-coated with Buna-N seals.

Part Number: RVPE4FV-3.3
     Material: Aluminum E-coated with FKM Type A seals.

Mounting: Flange mount 8 holes, .44″ dia, on 5.88 dia. B/C. (4″ TTMA Piping Flange)
Set Pressure: 3.63 to 4.55 psig (25.0 to 31.3 kPa)
Flow Rate: 173,156 scfh @ 6.25 psig (4,903 scmh @ 43.1 kPa)

See FW4SS  , FW4AL  or 27912AL flange weld neck for mounting to tank.
Mounting gasket if available in various materials.  See RGA401 style gaskets.