The butterfly valve element
A Butterfly Valvesincluding a housing having a hollow passage defining a flow path and a shaft mounted to the housing and extending transversely across the flow path. The shaft defines an axis of rotation for a butterfly valve element carried on the shaft. The valve element can be rotated about the axis between an open position permitting flow along the flow path and a closed position restricting flow along the flow path. The butterfly valve element includes a thin, substantially disc-shaped, flow-regulating plate having front and rear faces and a flow-straightening vane extending from one of the faces transversely relative to the shaft. The vane is solid and extends substantially to the wall of the hollow passage thereby defining separate non-communicating flow channels on opposite sides thereof for reducing flow turbulence and for straightening and accelerating flow across the plate.
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 Valves 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; BUTTERFLY VALVESsaid 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.
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