Title:
BUTTERFLY VALVE NOISE SUPPRESSOR
Document Type and Number:
WIPO Patent Application WO2002037009
Kind Code:
A9
Abstract:
A butterfly valve noise suppressor (10) is provided for reducing the noise generated by a gas flow passing through an open butterfly valve having a disc (16) pivotally mounted in a valve housing (12) for rotation about a transverse axis between an open and a closed position thereof. The noise suppressor (20) includes a plurality of flat and perforated baffle plates (22) arranged in a cruciform configuration, mounted in a flow path immediately downstream of the pivotal disc, axially extending and thereby dividing the downstream flow path into four axial and quadrant cross-sectional segments (24). The gas flow passing the edge of the pivotal disc in the valve generates a flow turbulence to form an unsteady large wake downstream of the valve. This unsteady wake is the source of noise. The cruciform baffle plates (21) permit the gas flow to pass therethrough without obstruction thereto, while allowing the turbulence to communicate laterally through the perforation (26), thereby dissipating the wake unsteadiness to reduce noise. The butterfly valve noise suppressor according to the present invention provides a better acoustic result compared to a muffler used in a conventional butterfly valve, and is lighter, durable, simpler and more economical to manufacture.
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Inventors:
TSE MAN-CHUN
Application Number:
PCT/CA2001/001481
Publication Date:
August 28, 2003
Filing Date:
October 23, 2001
Export Citation:
Assignee:
PRATT & WHITNEY CANADA (CA)
International Classes:
F02D9/02; F02M35/12; F16K1/22; F16K47/08; (IPC1-7): F16K47/08; F16K1/22; F02D9/02; F02M35/12
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