Patent ID: 6439540
Filing Date: 2002-08-27
Classification: F02D,F02M,F16K

Abstract:
A butterfly valve comprising:a) a valve housing defining a flow path; b) a closing member pivotally mounted in the valve housing for rotation about a axis between an open position for allowing the passage of a gas flow through the valve housing and a closed position for blocking the gas flow through the valve housing, the axis extending transversely and centrally across the closing member so that the closing member has a section to pivot in a generally downstream direction when the closing member moves from the closed toward the open position; and c) means for attenuating noise mounted to the valve housing immediately downstream of the closing member but without interfering with the section of the closing member pivoting downstream, the means including a duct defining a downstream flow path of the butterfly valve, and at least one perforated plate mounted in the duct, extending axially to divide a section of the duct into at least two axial segments.