PPVL720BXB - Betts - 20" Aluminum Tank Trailer Manhole/ Zinc Paf 406-98 Assembly Buna-N Gaskets No Collar - LJI Part: PPVL720BXB

The Betts PPVL720BXB Manhole Assembly is a 20-inch clamp ring style manhole with an integral PAF 406-98 surge suppression pressure relief valve for DOT406 and TC406 cargo tanks. The 10-inch reclosing pressure relief valve meets the dynamic pressure surge requirements of 49CFR178.345-10(b)(3)(ii) with less than one liter of leakage as tested per TTMA RP No. 81, and its cover doubles as a quick-open inspection hatch with a secondary safety catch. This assembly includes a 6496 P/V normal vent. The manhole body is aluminum with a zinc-plated steel pressure relief valve component and Buna-N gaskets, and is certified per 49CFR178.345-5 with a 36 psig test pressure. The weld collar is not included and should be selected separately to match the tank shell material.

Technical Specs List

• Size: 20 inches
• Manhole Body Material: Aluminum
• Pressure Relief Valve Material: Zinc-plated steel
• Gasket Material: Buna-N (Nitrile)
• Pressure Relief Valve Setting: 3.63 psig minimum, 4.55 psig maximum
• Maximum Temperature: 212F (100C)
• Test Pressure: 36 psig (per 49CFR178.345-5)
• Includes: 6496 P/V normal vent
• Weld Collar: Not included