Brochure

The Silent Treatment | 11
offers state-of-the-art attenuation of noise in
vapor, gas, or steam applications involving large
pressure drops. WhisperFlo trim is a laser cut,
stacked-disk cage assembly that is available in
a variety of globe and angle bodies for the most
severe applications.
n Up to 40 dBA of attenuation
n ASME Class 125–2500
n NPS 4–42
n Available in Fisher easy-e, EW, FB, HP, and TBX
control valves
n Customized flow characteristic for your
specific application
Every WhisperFlo cage assembly provides noise
attenuation across the following six areas:
n Unique Passage Shape: Reduces acoustic
efficiency and turbulence.
n Staged Pressure Reduction: Further reduces
acoustic efficiency.
n Exit Jet Independence: Parallel passages ensure
jet independence and prevent additional noise.
n Frequency Shifting: Higher frequencies are less
problematic to hearing and process systems.
n Velocity Management: Accommodates natural
fluid expansion.
n Complementary Body Design: Emerson-engineered
valve bodies prevent secondary noise sources.
PRODUCTION: Liqueed natural gas (LNG)
APPLICATION: Compressor antisurge
CHALLENGE: The high ow rate experienced by the previous antisurge control valve generated
unacceptable noise and vibration levels, posing a risk to process availability.
SOLUTION: Fisher FBT valve with a Fisher WhisperFlo cage, Fisher 585CLS actuator, and Fisher antisurge
accessory package.
RESULTS: Damaging noise and associated vibration were reduced to a safe level, while maintaining
high turndown and fast stroking speed, which re-established process availability.
PROVEN RESULTS
Fisher
®
WhisperFlo
™
Cage
Closeup View of
WhisperFlo Cage Section