Patent ID: 7069950

Claim:
A noise-attenuating module of a valve trim, wherein the noise attenuating module includes: a first divider plate; a second divider plate; and a plurality of flow segment plates disposed adjacent to and in contact with one another; at least one Herschel-Quincke tube formed by interconnected openings in the flow segment plates, wherein at least a portion of fluid flowing in the fluid path flows into a first end of the Herschel-Quincke tube then divides into two flowstreams in the tube and then exits the Herschel-Quincke tube through an opening in a second end of the module, thereby reducing flow noise by diverting part of an acoustic wave created by the flowing fluid into the Herschel-Quincke tube, such that the acoustic wave of the Herschel-Quincke tube exits the tube out of phase with the main flow path acoustic wave, thus attenuating the main flow path noise.