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Fisher™ Whisper™ NXV Trim
Fisher Vee-Ball Series valves (V150, V200, and V300) with the Whisper Trim combines the efficiency of a rotary valve with the acoustical attenuation capability of Whisper technology to provide improved performance in applications where aerodynamic noise is a concern.
The Fisher Whisper Trim can be utilized in gas and vapor service to reduce noise effects that pose safety risks to personnel and cause pipeline vibration.
Fisher™ Whisper™ NXV Trim


Critical Service
Noise abatement
Flow Characteristics
Modified equal percentage
Valve Sizes
NPS 4, NPS 6, NPS 8
Valve Size Standard
Pressure Class
ASME Class 150, ASME Class 300, ASME Class 600
Pressure Class
316L stainless steel
Process Media
Gas, vapor, or steam
Other Configurations
Contact your local Emerson sales office to learn about additional specifications or options for this product.


  • Whisper NXV Performance — Up to -20 dBA acoustical attenuation is achievable depending on service conditions.
  • Whisper NXV Fabrication — The additively manufactured attenuator features a rugged fabrication weld to provides structural integrity with the ball.
  • Excellent Flow Characteristic — Precise contouring of the V-notch ball provides an approximately equal percentage flow characteristic.
  • Improved Environmental Capabilities — The optional ENVIRO-SEAL packing system can control emissions to below the Environmental Protection Agency (EPA) limit of 100 parts per million (ppm) for valves.