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Fluid flow control valve with maximized noise reduction

  • US 4,397,331 A
  • Filed: 09/29/1978
  • Issued: 08/09/1983
  • Est. Priority Date: 09/29/1978
  • Status: Expired due to Term
First Claim
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1. In a fluid flow control valve having a fluid path, means for controlling the effective area of said path, and a perforated member having its perforations located in fluid pressure dropping relationship in said path, the improvement for minimizing the noise produced by the passage of fluid through said perforations, comprisinga perforated wall located in cooperative relation to said perforated member to form a chamber on the downstream side of said member perforations, the wall perforations in said wall being of a size to establish a maximized noise cutoff frequency to cause that portion of said noise having frequencies below said cutoff frequency to be reflected back into said chamber and to follow a noise path through the solid parts of said wall, thereby to maximize the separation of the path of said noise from the path of the fluid through said wall perforations, anda noise absorbing lining located on the interior surface of said wall within said chamber to absorb said reflected noise along said noise path and thus minimize the transmission of said noise downstream of said chamber.

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