Patent ID: 7963501
Filing Date: 2011-06-21
Classification: F02D,F02M,F16K

Abstract:
1. A butterfly valve, comprising: a housing having a hollow passage defining a flow path; a shaft mounted to said housing, extending transversely across said flow path, and defining an axis of rotation; and a butterfly valve element carried on said shaft for rotation about said axis between an open position for permitting flow along said flow path and a closed position for restricting flow along said flow path; said butterfly valve element including a substantially disc-shaped flow-regulating plate having front and rear faces and a flow-straightening vane extending from said front face transversely relative to said shaft so that said vane defines separate non-communicating flow channels on opposite sides thereof for straightening and accelerating flow across said plate; said butterfly valve element including a second vane extending from said rear face; wherein said hollow passage of said housing includes an inner wall surface; and wherein the flow-straightening vane includes at least one section that extends substantially to said inner wall surface with little clearance therebetween.