Compressor - Absorptive Silencers
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 Universal Silencer offers several absorptive silencer
designs for air moving equipment, such as compressors, centrifugal
blowers, and fans. These silencers contain fibrous packing
materials that control noise by "absorbing" noise energy.
As the sound waves pass through the spaces between the tightly
packed small-diameter fibers of the absorptive material, the
resulting viscous friction dissipates the sound energy as small
amounts of heat.
Absorptive silencers are highly effective on
high-frequency noise (500-8000 Hz). At frequencies above
and below this range, attenuation performance progressively diminishes.
Since the noise is absorbed by the packing media, the absorptive
silencer does not rely on internal baffles, tubes, or
other restrictive devices to achieve noise reduction.
Consequently,
absorptive silencers generally employ straight-through
or similar internal designs that impose very little restriction
to air flow. All units are mild steel construction
with primer-coated exterior.
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| U5
Series: Straight-through Silencer |
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The U5 Series is a premium, straight-through,
absorptive silencer. It provides excellent noise attenuation
due to its very high length-to-diameter ratio. It is especially
well suited for inlet service on small rotary positive or centrifugal
blowers or the discharge of vacuum pumps. The U5 is constructed
of mild steel and has an enamel finish. See
Page for U5
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| Common Applications: |
- Rotary positive/centrifugal blowers
- Vacuum pump discharge
- Air valves and cylinders
- Small low-pressure vents
- High frequency noise sources
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| U2 Series: Straight-through
Silencer |
| The U2 Series is an economical straight-through silencer |
| Common Applications: |
- Intermediate size rotary positive blower inlet
- Centrifugal blower inlet or discharge
- Intermediate size dry vacuum pump discharge
- Gas turbine inlet
- High-speed centrifugal compressor inlet
- High frequency noise sources
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| SU5 Series: Annular Flow Silencer |
| The SU5 Series is our highest grade standard absorptive
silencer. Its design consists of two concentric perforated cylinders
lined with acoustical pack, forming an annular flow path. This
design features blocked-line-of-sight, while providing full flow
area for low flow resistance. |
| SU4 Series: Annular Flow Silencer |
| The SU4 Series is Universal's second-highest grade
absorptive silencer, ranking just below the SU5 Series. The design
of this unit features a bullet centered in the flow tube to provide
annular flow path and partial blocked-line-of-sight. Pressure drop
is only slightly greater than the SU5. |
| SU3: Annular Flow Silencer |
| The SU3 Series is the most economical of Universal's
three annular design silencers, ranking in performance below the
SU5 and SU4. Its design, except for length, is almost identical
to the SU4, including annular flow path and partial blocked-line-of-sight.
The pressure drop coefficient is the same as for the SU4 Series. |
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