Silencer for safety valve, steam applications

Types :

    • diffuser silencer
    • absorptive silencer
    • combined diffuser and absorptive silencer
    • inline silencer

Applications :

    • vent or purge
    • boiler
    • by-pass turbine

Medium :

    • air
    • vapor
    • natural gas
    • industrial gas

Design :

The inlet pipe of the silencer is perforated with a number of holes. Other perforated pipes with a larger number of holes are added concentrically. The space between them is filled with a wire mesh of stainless steel.

Characteristics :

    • noise reduction up to 50 dB (A)
    • diameters : DN25 à DN450
    • connections : B.W. – flanges EN / ANSI
    • materials : carbon steel, stainless steel
    • temperature : -40°C à +450°C
    • vertical and horizontal mounting
    • typical pressure drop > 0,2 bar
    • Optional accessories

Standards : ISO 9001, PED 97/23/CE

Please find our attached document about quality and fault prevention.

Non exhaustive list of customers using our silencers (in French).

Silencer used with safety valve for saturated steam

Gas silencers

Each silencer HELYON is designed according to the characteristics of your installation, your specifications and your needs.

Applications : These gas and air silencers are used to reduce sound power level for this type of plant :

  • Turbine
  • Exhaust line
  • Safety valve outlet
  • Dryer

and all applications where the noise level is too high for the environment.

Fluids :
All industrial gases: Air, Nitrogen N2, Argon Ar, Oxygen O2, Carbon Dioxide CO2, Hydrogen H2, Helium He, etc.

Characteristics :

    • Noise reduction according to your needs (minimum of 20 dB (A))
    • DN calculation based on flow rate
    • Carbon or stainless steel construction
    • Connection: flanged or threaded (for small diameters)
    • Drain system

Options :

    • Cover against rain or snow
    • Bird protection
    • Brackets
    • Special support

Do not hesitate to contact us for your specific requirements, each silencer is custom-sized.


Gas silencer

Some examples of silencer installations

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Silencers : examples


Ø 0,4 m, Height 1,54 m, Weight 190 kg with brackets


Ø 0,8 m, Height 1,55 m, Weight 350 kg with brackets and gooseneck 45° to redirect the outlet flow

Ø 0,74 m, Height 1,9 m, Weight 340 kg with brackets and rain protection


mobile silencer, can be separated in two parts
Ø 1,1 m, Total height 3,175 m, Weight 1100 kg


Ø 3,4 m, Height 2,9 m, Weight 4600 kg


Ø 6 m, Height 5,4 m, Weight 18000 kg