Accordingly it is the general object of the present invention to provide a butterfly valve wherein the circumference of the valve does not press into the inner surface of the seat ring when the valve is in the closed position.BUTTERFLY VALVES

It is another object of the present invention to provide a butterfly valve having excellent sealing efficiency. Butterfly Valves

In keeping with the principles of the present invention, the objects are accomplished by a unique butterfly valve of the type including a valve casing, a seat ring provided in the valve casing and a butterfly rotatably provided in the valve casing and engaging with the seat ring. The butterfly valve further includes a pair of semi-circular sealing projections formed on the seat ring. Butterfly ValvesThe sealing projections are arranged and configured such that one sealing projection engages with one side of the butterfly while another sealing projection engages with another side of the butterfly whereby a butterfly valve with an excelent seal is formed .

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