All of Flo-Dyne's atmospheric vent silencers can be supplied with or without an inlet diffuser. However, when silencers are supplied without an inlet diffuser this usually result in a larger silencer as the absorptive pack has to make up for the acoustic attenuation that the diffuser would have provided.
Where a silencer is provided with an inlet diffuser then the diffuser then we can help choose a suitable pressure drop (back pressure) and we will then constructed the diffuser accordingly.
Back pressure is sometimes seen as a bad thing, however this is not always the case. Because it is impossible to have a silencer with zero pressure drop, because there would then be no flow, why not choose a pressure drop that improves the cost and efficiency of the system.
When the back pressure is chosen carefully then the noise generated at the upstream valve will be reduced, less noise will be radiated by the pipework leading up to the silencer, the flow velocity in the pipework between the valve and the silencer can be reduced, as can the pipe size, as well as achieving an overall smaller size of silencer.
When required, we can help examine the pressure losses through the pipework between the venting valve and the silencer and recommend the most suitable silencer pressure drop for your system.
Equipment is available in a variety of materials, but most commonly in ordinary carbon steels, 3104(L) and 316(L) stainless steels.
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