F91 Fire-Safe Flanged Ball Valves

Oct. 12, 2006

Fire-safe TRIAC F91 stainless steel flanged ball valves use a regular-port design to minimize cost and reduce operating torque while offering rugged construction with a solid unibody and patented pyramidal stem packing. Ideal for applications from the oil field to food processing plants, the ANSI-class 150 valves are fire-safe, comply with the NACE MRO175 standard for corrosion resistance, and are certified to API 607-4th edition.


The live-loaded pyramidal stem packing system features a patented 45-deg. primary seal with Belleville washers and chevron packing, protecting against wear and stem leaks common with ordinary ball valves. A patented automation pad allows direct mounting of ISO5211-compliant actuators to eliminate the cost and fabrication of special couplings or brackets.


F91 valves are available in sizes 0.5 to 6 in. (13 to 152 mm) in manual and automated versions, with electric or pneumatic actuators, spring-return, or double-acting configurations. The investment-cast, one-piece body can be 316SS or WCB with a stainless steel ball and blowout-proof stem as standard.


A fully machined bore ensures smooth flow and clog resistance. A wide range of seat materials includes PTFE, RTFE, 50/50, 15% CFTE, PEEK, and others, as well as several hard-face and metal-metal options. F91 valves come standard with an anti-static device and can be specified as traceable.

  • Unibody direct mount flanged ball valve
  • ASME Class 150
  • Sizes 0.5 to 6 in. (13 to 152 mm)
  • Regular port
  • 316 Stainless Steel or WCB
  • ISO 5211 actuator mounting pad
  • RTFE seats standard
  • NACE MR-0175
  • Pyramidal stem seal design
  • Superior live-loaded packing system
  • Blowout-proof stem with dual anti-static devices
  • Firesafe: API 607 6th Edition