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

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Drinking Water
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Air Compressors
Electrical Controls Control Panels
Level Controls

Flo-Dyne Installation & Commissioning Services

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Surge Vessels
Compressor systems
Control panels

Pulsation Dampeners

Roots Blowers
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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





Release of steam to atmosphere creates noise which is dangerous to plant personnel and is environmentally unacceptable.

The steam may be released from either low pressure (LP steam vent silencer) of high pressure (HP steam vent silencer) as part of boiler start up system, a bypass vent or a safety relief valve vent system.

In each case Flo-Dyne offer the most economical approach by optimizing silencer design to produce a guaranteed solution through selection of silencer pressure drop and flow velocities appropriate to the duty.

Flo-Dyne's steam vent silencer model type BOS can be supplied with an inlet diffuser built to pressure vessel standards that will let down the inlet pressure to atmospheric pressure.

Not all steam that is vented is dry, so where there is moisture carried in the steam flow Flo-Dyne can provide a separator element to remove the excess moisture and prevent this hot liquid from being exhausted out through the vent to fall as "hot rain" in the area surrounding the vent.

The pressure drop across the inlet diffuser is selected according to the duty of the silencer, we can examine the pressure losses through the pipework and recommend the most suitable silencer pressure drop for the vent duty.

If there is a significant length pipework between the venting valve and the silencer, the pressure drop across the venting valve may lead to high noise levels being radiated by the pipework. Flo-Dyne can advise on noise levels radiated by pipework in such cases, and make recommendations for mitigation.

silencer being packedSilencers may be packed or pack free diffuser only types, depending on the duty requirements. Where a packed silencer is needed the packing material will often be chosen from glass fibre, mineral or ceramic fibre as considered appropriate for the operating conditions.

The structural design of the Flo-Dyne Vent Silencer is given the same thorough attention as its acoustic design. The external shell is constructed of seamless pipe in smaller sizes and continuously welded rolled plate in larger diameter silencers.

Silencers may be mounted horizontally or vertically, pads or cradle type supports are available for easy installation.

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