Guardian Vacuum Breaker, NPS Swivel Connection

The Betts’ GuardianTM vacuum breaker is a spring loaded reclosing vacuum relief valve for use on a cargo tank’s vacuum relief system. The vacuum breaker 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
  • Seal tabs on shroud and swivel nut for security measures.
  • Simple In-place Maintenance
  • Available ECTFE (Halar®) coated.
  • Multiple sizes and mounting options
  • Multiple seal options
  • Vibration damping design
  • 1” NPT and ¼” NPT mounting ports
  • 3″ and 4″ NPS Swivel connection

Parts List

Product Details

Part NumberSize and ConnectionWeight lbs. [kg]
RVV3S*-**3" NPS SWIVEL4.5 [2.0]
RVV4S*-**4" NPS SWIVEL5.9 [2.7]
- An Example of a part number would be RVV3ST. This would have PTFE seals.
- 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
SizeSet Vacuum (PSIG)Vacuum Flow
3"1.518,000 SCFH @ 3.0 PSIG
4"1.518,000 SCFH @ 3.0 PSIG



Seal Kits & Accessories

Seal Kit part number: SK-RV VT*

*Mounting gasket not included in seal kit

Spanner wrench part number: 75825EY