초록 ▼

A noise attenuating device for reducing the noise generated by a gas flow passing through an open butterfly valve having a disc pivotally mounted in a valve housing for rotation about a transversal axis between an open and a closed position thereof. The noise attenuating device comprises a first ser

A noise attenuating device for reducing the noise generated by a gas flow passing through an open butterfly valve having a disc pivotally mounted in a valve housing for rotation about a transversal axis between an open and a closed position thereof. The noise attenuating device comprises a first series of elongated members extending from the upstream side of the disc above the transversal axis and a second series of generally diametrically opposed elongated members extending from the downstream side of the disc below the horizontal axis. Typically, the elongated members extend at 45 degree from the disc of the butterfly valve.

대표청구항 ▼

[ I claim:] [1.] In a butterfly valve comprising a valve housing defining a flow path, and a closure member pivotally mounted in said valve housing for rotation about an axis between an open position for allowing the passage of a gas flow through said valve housing and a closed position wherein said

[ I claim:] [1.] In a butterfly valve comprising a valve housing defining a flow path, and a closure member pivotally mounted in said valve housing for rotation about an axis between an open position for allowing the passage of a gas flow through said valve housing and a closed position wherein said closure member closes all the gas flow through said valve housing, said axis extending centrally of said closure member and dividing said closure member into first and second sections, said closure member having a pressure side surface adapted to face upstream and a suction side surface adapted to face downstream, said closure member including a noise attenuating means having a first series of separate elongated members fixedly attached to said pressure side surface and extending from said first section of said pressure side surface and a second series of separate elongated members fixedly attached to said suction side surface and extending from said second section of said suction side surface, whereby the elongated members are effective for attenuating aerodynamic throttling noise without obstructing significantly the flow of gas.