Vent Silencers

Steam exhausts
Air vents
Process Gases
Relief valves
Safety valves
Bypass valves
Blow down vents
High temp vents

Diffuser Silencers

Atmospheric vents
Control valves
Pressure let down
Steam Vents & Process Vents
Pressure regulators

In-Line Silencers

Control valves
Orifice plates
Gas ejectors
Steam ejectors
Gas compressors
Axial compressors
Centifugal compressors
Roots blowers and
Multi-lobe blowers and exhausters

Surge Tanks

Drinking Water
Raw water
Foul Water

Ancillary Surge Controls & Equipment

Air Compressors
Electrical Controls Control Panels
Level Controls

Flo-Dyne Installation & Commissioning Services

Pipeline Surge Analysis & Reporting

Refurbishment and repair

Surge Vessels
Compressor systems
Control panels

Pulsation Dampeners

Roots Blowers
Multi-Lobe Blowers
Recip compressor
Recip pumps Suction Lines
Discharge Lines

Acoustic Filters

Hydraulic pumps
Refrigerant Compressors
Air Conditioning Compressors

General Information

Quality Registration to

Surge Tanks


Vent Silencers


Pulsation Dampeners


In-line Silencers

Blower Silencers





The Flo-Dyne Controls HUSH PUP is a non-packed, reactive silencer. It works by expanding the incoming flow through many small holes. This expansion creates a reduction and frequency shift in the vent noise. By correct selection of hole size, spacing and pattern this reduction can be optimized to produce an overall quieting. This simple, yet effective silencing concept has been tested and proven in over thousands of applications as a component part of Flo-Dyne Controls vent and in-line silencers.

hush pup silencer

The HUSH PUP can be used in any high pressure vent application where a moderate degree of silencing is required. Typical applications include steam relief valve discharge, air compressor vents, boiler blow down lines, gas plant vents and product dump vents

The HUSH PUP will provide a 15 to 20 dB reduction on most vent applications The attenuation curve shown is the actual performance attained on a high pressure air vent test. For more critical silencing application, the Flo-Dyne Controls Vent Silencer is available.

All steel construction allows the handling of high temperature gas or steam. Designed like a pressure vessel, the HUSH PUP can be subjected to high pressure, high impact flow with

hush pup attenuation curveno problems. Hole sizes, equal or greater than those of quiet trim valves, prevents clogging problems encountered in some metal type silencers. The all-welded design provides years of non-maintenance, trouble free service.

Contact us now with your requirements.

UK office:
Tel: +44 (0) 1494 770088
Fax: +44 (0) 1494 770099
Email: sales@flo-dyne.net

India office:
Tel: +91 77 384 97 300
Email: sales-india@flo-dyne.net