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The Series NF are three-piece forged material flanged and weld end Trunnion Mounted Ball Valves with bubble tight sealing at high and low
pressures and are intrinsically firesafe due to metal-to-metal sealing with loss of seats.The Series NF features a blowout proof, multiple sealing
stem, double body sealing, double block and bleed designs, and a fire safe design. Options are available to add Double Piston Effect Seats. In
addition, Series NF Ball Valve are ISO 15848-1 fugitive emissions tested and certified.
Virgo NF3 Series


Size range
NPS 2-36
End connections
Flanged ASME and weld
Pressure rating:
ASME Class 150 to 2500
Temperature rating
Up to 450 °F (230 °C)


  • Designed to ASME B16.34 and API 6D.
  • ISO 15848-1 fugitive emissions tested and
  • certified.
  • 3 piece design, full and reduced bore
  • Anti-static design: provides continuity
  • throughout the entire valve.
  • Bi-directional sealing with zero leakage.
  • Blowout proof back seated stem.
  • Devlon® soft seats with PEEK option
  • API 607 and API 6FA fire test certification
  • ISO 5211 mounting pad which simplifies
  • actuator or gear operator mounting.
  • NACE MR0175 / ISO 15156 (all parts).
  • Self-relieving seat design, for cavity relief in
  • the closed position, with inter-changeable
  • double piston effect seat option
  • Sealant Injection Fittings with buried check
  • valve.
  • CRN
  • CE/PED
  • ASME Sec VIII Div 1