Improved BUTTERFLY VALVES accommodating full flow when in an open position, in which the valve is made from a resilient material and has compressive engagement with a seat contoured along a generally frusto or semispherical surface, and in which a preselected throttling is attained by a throttling slot extending axially along the seat, to accommodate limited passage of fluid past the valve, and in which compressive engagement of the valve with the seat, when in a closed position of the valve, provides a leak-proof butterfly type of valve.
Butterfly ValvesA principal object of the present invention is to provide an improved butterfly valve operable where leak-tight conditions are required, in which a bleed passageway extending along the valve seat for a portion of the length of travel of the valve, accommodates the throttling of fluid past the valve as the valve moves between its closed and full open positions.
Another object of the invention is to provide an improved butterfly valve capable of complete fluid flow shut-off, over a wide range of pressure variations, and providing a throttling effect as the valve moves from its fully closed position to its fully open position.
Another object of the invention is to provide a resilient butterfly valve cooperating with a contoured valve seat in the valve housing, to compressively seal the valve to its seat when in a fully closed position, and to continue the sealing effect over a wide range of pressure variations.
Still another object of the invention is to provide an improved form of butterfly valve having a contoured seat for the valve, extending over a proportionate part of travel of the valve from its open to its closed position, with a bleed passageway along the seat decreasing in cross-sectional area as the valve travels from its fully open to its fully closed position to accommodate the throttling of fluid past the valve as the valve is moved towards a shut-off position.
Butterfly ValvesMany other features, advantages and additional objects of the present invention will become manifest to those versed in the art upon making reference to the detailed description which follows and the accompanying sheets of drawings, in which a certain preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example only.

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