NOISE ATTENUATING DEVICE FOR BUTTERFLY VALVES

摘要

A noise attenuating device for reducing the noise generated by a gas flow passing through an open butterfly valve having a disc (18) pivotally mounted in a valve housing (12) 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 (30) extending from the upstream side of the disc above the transversal axis and a second series of generally diametrically opposed elongated members (30) 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.