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A two-piece, full and reduced bore, floating ball valve with tamper-proof stem seal, blowout-proof stem and triple O-ring seal stem design.
The Series SO provides bubble tight seat sealing, fire safe performance and is tested and certified to
API 641 for fugitive emissions
Virgo Series SO


End connections:
Flanged ASME and weld ends
Pressure rating
ASME Class 150 to 1500
Temperature rating
Up to 450°F (230°C


  • Designed to ASME B16.34 and API 6D.
  • API 641 fugitive emissions tested and certified.
  • Anti-static design: provides continuity throughout the entire valve.
  • Ball has pressure equalization hole to prevent trapped pressure in the body cavity in the open position.
  • Blowout proof back seated stem.
  • RTFE seats in class 150 and class 300.
  • Delrin® seats in class 600 and higher.
  • NACE MR0175 / ISO 15156 (all parts).
  • SS trim for corrosion protection.
  • Standard locking handle.
  • Bi-directional zero leakage.
  • ISO 5211 mounting pad which simplifies actuator or gear operator mounting.
  • Self-relieving seat design, for cavity relief in the closed position.
  • Available in both full and reduced port
  • Triple stem seal: multiple seal for added reliability.
  • Freeze resistant design available in all floating design ball valves.