Brochure

14 | The Silent Treatment
offers proven noise attenuation in steam, gas, or
vapor venting applications. A vent diffuser places
backpressure on the control valve while venting
process to the atmosphere.
The Fisher vent diffuser shares the total system
pressure drop with the vent valve. The benefits are:
1) the vent valve noise is reduced and 2) the noise
at the atmospheric vent point is reduced.
n Up to 40 dBA of system noise attenuation
n ASME Class 150–2500
n Inl et sizes NPS 2–26
n End connections include raised-face flange,
ring-type joint flange, or buttweld end
n Optional outer shell directs the vented process
away from components and personnel
PROVEN RESULTS
Fisher
®
Vent Diffuser
PRODUCTION: Combined cycle power plant
APPLICATION: Sky vent
CHALLENGE: Noise and vibration occurred during high flow venting of the heat recovery steam generator.
SOLUTION: Engineered system of Fisher NPS 16 valve body, Fisher WhisperFlo cage, and Fisher vent diffuser.
RESULTS: Damaging noise and vibration were reduced to a safe level for plant personnel and at
the fenceline.