This proposal will demonstrate (in 2" to 4" size), a noise reucing trim that can be utilized in rotary control/on-off ball valves. This valve trim addresses noise at the source. The basic design has a variable impedence trim to cause a high impedence at low angles of opening and low impedence (very little flow restriction) at large opening angles. It is an ideal valve for pressurization/de-pressurization, blow-down and variable delta p-variable flow control applications. Typical noise attenuation ranges from-15-30dba depending upon trim arrangement and selection.
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