Guardian Pressure Valve, NPS Connection

The Betts’ Guardian™ vent is a spring loaded reclosing pressure relief device/valve for use as a 407/412 cargo tank’s primary pressure relief system. The pressure 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.
  • 3″ & 4″ NPS Threaded Connection

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Product Details

Part NumberSize and ConnectionWeight lbs. [kg]
RVP3N*-**3" NPS12.8 [5.8]
RVP4N*-**4" NPS13.2 [6.0]
- An Example of a part number would be RVP3AT-25. This would have PTFE seals and be used on a 25 MAWP tank.
- Part numbers with ECTFE (Halar®) coating as follows: RVPL3A*-**. "L" indicates ECTFE coated.
- Values shown are test values. Actual results may vary due to service conditions.
* CodeMaterialTemp. Range
TPTFE-40°F - 400°F [-40°C - 204°C]
FFluorosilicone-50°F - 350°F [-45°C - 176°C]
KKalrez-20°F - 400°F [-28°C - 204°C]
VBFKM BLT-15°F - 400°F [-26°C - 204°C]
* Designates Seal Material
**MAWPSizeSet Pressure (PSIG)Pressure FlowWater Flow Rates (GPM)
253"30379,462 SCFH @ 40 PSIG980 @ 40 psi
253"30409,558 SCFH @ 45 PSIG1050 @ 45 psi
303"36409,558 SCFH @ 45 PSIG1050 @ 45 psi
353"42457,740 SCFH @ 52.5 PSIG1075 @ 52.5 psi
403"48514,539 SCFH @ 60 PSIG1100 @ 60 psi
254"30389,482 SCFH @ 40 PSIG1000 @ 40 psi
254"30432,563 SCFH @ 45 PSIG1100 @ 45 psi
304"36432,563 SCFH @ 45 PSIG1100 @ 45 psi
354"42496,955 SCFH @ 52.5 PSIG1150 @ 52.5 psi
404"48564,486 SCFH @ 60 PSIG1200 @ 60 psi
** Designates Tank MAWP

Seal Kits & Accessories

Seal Kit part number: SK-RVPT*

*Mounting gasket not included in seal kit

Spanner wrench part number: 75825EY

Dis-assembly wrench number : 75819ZC