Or call 610-863-6300
<< back to products

Treatment Strategy

  • Source Airborne

Application Use

  • Industrial In-plant
  • Industrial New Con.
  • OEM
  • Environmental
  • HVAC


Process Silencers

Reduce Unwanted Noise Created By High Pressure Process Flow of Air, Gas or Steam Through A Valve Or Other Orifice

About BRD HUSH VENT™ Silencers:

HUSH VENT™ silencers combine dissipative and reactive technology for balanced noise reduction over a broad frequency range and peak noise reduction in a more concentrated frequency range.  A three stage acoustic design is common to all high pressure HUSH VENT™ silencers used on blowdown and inline applications alike.  The first stage inlet/diffuser provides a distribued expansion pattern and frequency shift of the unsilenced noise into higher octave bands while opposing the dynamic forces of the high velocity flow stream.  The second stage expansion chamber reduces and evens velocities appropriate for flow thorugh the third stage acoustic core where primary silencing occurs.  Core spacing and length are varied to provide optimum attenuation at the predominant frequency passing through the diffuser.

Heat recovery steam generator (HRSG) steam drum vent silencers ready for installation at an electric generating station.



  • Round and rectangular designs
  • All welded heavy duty steel construction
  • For continuous or intermittent service
  • Inlet nozzle and diffuser sections are constructed with full penetration welds in accordance with ASME code section IX (This is critical to the integrity of the silencer in standard and upset conditions)
  • Designed to withstand the cyclical effective of temperature and flow forces
  • Standard stock and custom designs
  • Can incorporate supports for horizontal or vertical installation
  • Also available in stainless steel, Monel and other metal alloys


  • Boiler start-up and purge
  • Switch valves and safety relief valves
  • In-line control valves and pressure reducing stations (PRVs)
  • Steam ejectors
  • Turbine by-pass lines
  • Steam drum relief valves
  • Any steam, gas or air process vent, blow-down or in-line service
  • Snort valves
  • Product dump vents
  • Natural gas metering and compressor stations
  • Air and gas separation plants
  • Commercial steam PRV service


Information Required To Make A HUSH VENT™ Silencer Selection

  • Gas Type & Maximum Flow Rate __________________________________________________
  • Gas Pressure (Valve Upstream) ___________________________________________________
  • Gas Temperature (Valve Upstream) ________________________________________________
  • Required Noise Level ___________________________________________________________
  • Distance from Silencer for Noise Level Prediction ______________________________________
  • Allowable Pressure Drop __________________________________________________________
  • Inlet Connection Orientation & Size __________________________________________________
  • Inlet Connection Type & Rating _____________________________________________________
  • Type of Mounting System __________________________________________________________
  • Desired Accessories ______________________________________________________________

BRD product specialists can provide fast, accurate quotations with fully dimensioned outlined drawings and performance data based on the above data.  We utilize a computerized selection procedure that allows us to optimize performance in the most cost-effective design to meet your requirements.



HUSH VENT™ in-line acoustic diffuser (see left) on pressure reducing valve application (see above).