The Betts Guardian RVC3ST-25 Combo Valve is a spring-loaded, reclosing pressure and vacuum relief device for a cargo tank's primary pressure and vacuum relief system, designed, tested, and marked in accordance with US DOT 49CFR178.345-10, 178.347-4, and 178.348-4. The body and O-ring holder are constructed of 316L stainless steel with PTFE seals for compatibility with a wide range of products and temperatures. It features a vibration-resistant magnetic vacuum seat and a compact, optimized flow design, with a 3-inch NPS swivel mount rated for a 25 psig MAWP tank.
Technical Specs List
- Size: 3 inches
- Connection: NPS Swivel Nut
- Body/O-Ring Holder Material: 316L Stainless Steel
- Seal Material: PTFE
- Temperature Range: -40F to 400F (-40C to 204C)
- Tank MAWP Rating: 25 psig
- Set Pressure: 30 psig
- Rated Pressure Air Flow Capacity: 409,559 SCFH @ 45 psig
- Water Flow Rate: 1,050 gpm @ 45 psig
- Set Vacuum: 1.5 psig
- Rated Vacuum Air Flow Capacity: 12,500 SCFH @ 3.0 psig
- Minimum Bursting Pressure: 200 psi (13.8 bar)
- Weight: 17.4 pounds




