ST-3D™ Noise Plate
Attenuation Diffuser

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In certain process conditions, the Trimteck ST-3D Diffuser can be used in series with any style valve to reduce the sound level up to 25dBA, while often eliminating the need for more costly in-valve noise attenuation trim.

ST-3D Diffusers share high pressure drops with the control valve, and control the sound level by passing flow at certain conditions through a series of small openings to eliminate excessive turbulence and energy and generate backpressure.

Correct sizing and spacing of the drilled holes is critical, which is why Trimteck custom-engineers each ST-3D Diffuser to accommodate the flow capacity required for any particular application.

  • Length and number of drilled holes are custom-designed for specific applications
  • Commonly manufactured from carbon and stainless steels, but available in a variety of other materials
Base Valve Type

Globe, Angle, V-Notch Ball, Eccentric Plug, Trunnion Ball, Butterfly, Custom-Engineered/Specialty

Trim Type


Sizes (NPS)

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Pressure Class (ASME/ANSI)

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Flow Direction

One Way

Pressure Stages



Open Shell, Outlet Head, Wafer


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