Flowserve Gaseous Noise Control Brochure - Flowserve Corporation

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3. StealthIntroductionThe most sophisticated noise attenuation design, Stealth trimeffectively reduces sound pressure levels in the most demandingapplications (Figure 3.1: Control Valve with Stealth Trim).The advanced Stealth design combines the most effective noiseand pressure control mechanisms to produce the most efficientnoise reduction trim ever created.DesignStealth is produced by laser cutting circular discs to form fluidpassageways and then braising the discs together to form aseat retainer (Figure 3.2: Stealth Stack). Three different discsare cut and matched together to form a flow path set (Figure3.3: Stealth Discs) (Figure 3.4: Stealth Flow Passage). A numberof disc sets are then stacked together and the whole assembly isbraised together to form a stack.Similar to TigerTooth an important mechanism reducing thepressure in Stealth trim is the sudden expansion and contractionphenomenon that takes place as the flow passes over theteeth. The Stealth trim’s ability to gradually reduce pressurewithout generating high velocities is important for the reductionof noise in the process line.In addition to reducing the pressure gradually, Stealth takes advantageof frequency shifting by providing small outlet holeswhich raise the frequency and lower the noise.An important feature in the noise control capabilities of theStealth is the WaveCracker technology which provides extranoise attenuation without creating extra pressure drops in thevalve.Trim exit flow paths on the Stealth are angled to direct the flowto the valve exit. This feature increases the flow capacity of thevalve and lowers the noise by reducing exit turbulence.Combining the pressure reduction, and velocity control featureswith the noise elimination features of the Stealth produces themost advanced noise elimination technology available.Figure 3.1: Control Valve with Stealth Trim10
flowserve.comBase Valve DesignBase valves for the Stealth include the Mark One and Mark 100.Mechanisms at Work• Pressure Control• Velocity Control• Attenuation• Frequency Shifting• Noise Cancellation• WaveCrackerFigure 3.2: Stealth StackFigure 3.3: Stealth DiscsFigure 3.4: Stealth Flow Passage11
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Flowserve Gaseous Noise Control Brochure - Flowserve Corporation

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