In-Line Silencers

An in-line silencer employs the same principle of acoustic design as a vent silencer. The main consideration with in-line noise is to reduce the vibration caused by the valve noise, as noise is basically air born vibration.

There are two types of silencer for in-line applications;

Control Valve Silencers are designed to provide a pressure drop or back pressure and are primarily used in conjunction with a control valve. The attenuation is achieved with a combination of diffuser design and an absorptive section.
Direct In-Line Silencers are designed to produce as little pressure loss as possible but achieve the required attenuation using only an absorptive section.
Ventx can manufacture both types of In-Line silencer for use in pressurized systems and to a suitable pressure design code. There are a number of variations with In-Line silencers, and we can design and supply just Diffuser Silencers or Insert Silencers to suit your application.

Ventx silencers are also designed to provide a required back pressure, which can help when selecting a valve and this is why our silencer inlets are always designed and manufactured with reference to a design code. Read more about In-Line Silencers.

In many industrial processes, noise attenuation measures focus on the noise created by exhaust and venting devices.  But much of the noise pollution which occurs as a result of power generation and other processes can be at an intermediate stage, and if they aren’t dealt with, these noise levels can have an adverse effect on staff and visitors who may be exposed to them repeatedly and for extended periods.  Just as there are specific designs of silencers for exhausts and venting devices, there are also in-line silencers which are made specifically to deal with noise created by gas flow within ducting or other conduits.

Whenever a flow of gas passes through a chamber or junction, or simply from one diameter of pipe to another, there is the potential for the flow to be disrupted resulting in unwanted noise.  This noise is sometimes amplified by the downstream piping.  Fitting an in line silencer at such a point in the system balances the flow to eliminate such noise at the source.

Each direct in-line silencer supplied by Ventx is custom built to provide optimal performance in a specific system.  We begin with an acoustic analysis of the system, recording the levels and frequencies of noise produced.  If your facility is still under construction, or has not yet left the drawing board, we can use your specifications along with our sophisticated computer software to model the acoustic properties of the proposed installation.

Once a design has been arrived at, your direct in-line silencer is manufactured using long strand fibreglass acoustic packing as absorption material.  This acoustic core can be supplied in a custom fabricated in line silencer housing, or as-is in order to be inserted into your existing pipework. A good acoustic match will mean acoustic cladding of pipework is unnecessary.