Model 710 Model PAF 406-98 Surge DOT 406 Pressure Relief Device

Betts PAF 406-98 Surge Suppression Pressure Relief Valve is the proven leader for cargo tank longevity, protection and safety.

The 406-98 incorporates a 10” (254mm) reclosing pressure relief valve (PRV) that satisfies primary 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 PRV cover also serves as a quick-open inspection hatch that incorporates a secondary safety catch. PPVL models include an overturn compensating 6496 P/V normal vent.

PAF 406-98 Surge PRV’s have a maximum service temperature of 212°F (100°C). Stainless versions of the PRV are available using prefix “PPSS”. See Betts’ line of PAF306 surge PRV’s for use on MC306 cargo tanks.

Part List

Product Details

Part NumberCollar MaterialStrongback and LatchPRV CoverNormal VentWeight
304 Stainless
316 Stainless
Steel Zinc-plated
Steel Zinc-plated
304 Stainless
304 Stainless
E-Coated Aluminum
E-Coated Aluminum
E-Coated Aluminum
E-Coated Aluminum
6496AL Aluminum
6496AL Aluminum
6496AL Aluminum
6496AL Aluminum
15.9 lbs (7.2 kg)
18.9 lbs (8.6 kg)
18.9 lbs (8.6 kg)
18.9 lbs (8.6 kg)
*Replace asterisk in part number to designate gasket material.

Example Assembly: PPVL710BAB

(10” PAF Pressure Relief Device, Zinc Steel Plated Strongback and Latch, Aluminum Collar + Black Nitrile Buna-N)

LetterGasket Material
See catalog page S80P0A for full list.
Nitrile (Buna-N)
FKM Type A (Viton™ A)
PTFE (w/ Nitrile or Silicone Core)
White Hypalon
Last Letter of part number designates seal material. See gasket material table.
Suffix "059" option for padlock loop installed in strongback.
Prefix "PSA" for both 6496 normal vent & 6234AL inbreathing vent included.
Suffix "092" option with stainlesss hardware (strongback and latch).
Collar material should correspond with tank shell material. When welding collars to tank, care should be taken to insure collar remains flat and round with use of a welding fixture if necessary.

Technical Specifications
PAF 406-98 Pressure Relief Valve6496AL Normal Vent (P/V Vent)
Set Pressure (PRV Designed for 3.3 psig MAWP tank)Rated Air Flow CapacityLiquid Flow CapacityPressureVaccum
Min: 3.63 psig (25.0 kPa)
Max: 4.55 psig (31.4 kPa)
494,084 SCFH @ 6.25 psig (13,992 SCMH @ 43.1 kPa)
294,985 SCFH @ 5 psig (8,353 SCMH @ 34.5 kPa)
1,335 gpm @ 5.0 psig (5,053 Ipm @ 34.5 kPa)Set: 1.0 psig (6.9 kPa)
Flow Capacity: 1,200 SCFH @ 3 psig (34 SCMH @ 20.7 kPa)
Set: Max .375 psig (Max 2.6 kPa)
3,350 SCFH @ 1 psig (95 SCMH @ 6.9 kPa)