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Fisher™ FB Angle Valves
Fisher FB angle valves are used with compressible fluids on special applications requiring maximum noise attenuation capability and high capacity.
Typical applications include main steam reducing valves and compressor bypass valves. FB valves are also commonly used for sour gas applications in petrochemical and gas processing plants.
Fisher™ FB Angle Valves


CUTR, PED, CRN, Fugitive Emission, NACE
Critical Service
Noise Abatement, Steam Conditioning, Outgassing
Flow Characteristics
Carbon Steel, Stainless, Duplex, Alloy, Cast Iron
Operating Temperature
Standard Temperature, High Temperature
Pressure Class
Process Connection Type
Flanged, Butt Weld, RTJ
Shutoff Class
Class II (FCI 70-2), Class III (FCI 70-2), Class IV (FCI 70-2), Class V (FCI 70-2)
Valve Size
8 x 12, 10 x 16, 12 x 16, 12 x 18, 12 x 20, 16 x 24, 20 x 30, 24 x 36, 30 x 36, 36 x 42, 42 x 48
Valve Size Standard


  • Whisper Trim™ III or WhisperFlo™ cages used in FBD or FBT valves can reduce noise produced by high flow rates and large pressure drops.
  • Regeneration of valve noise is significantly reduced by reducing the outlet flow velocity with an expanded outlet design.
  • The design eliminates gasketing problems caused by thermal expansion and contraction of long parts, such as the cage assembly.
  • The ENVIRO-SEAL™ or HIGH-SEAL packing system options are available. These packing systems provide excellent sealing, guiding, and loading force transmission.
  • A spring-loaded seal ring with PEEK anti-extrusion rings is available on FBT valves for Class V shutoff up to 316°C (600°F). Bore seal is available on FBD valves for Class V shutoff above 316°C (600°F).