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Butterfly valve

Image Number 3 for United States Patent #3991974.

A butterfly valve comprising a body having an internal cylindrical bore with two radial co-axial passages diametrically opposed with respect to the bore and a butterfly including a spherical cap section and two co-axially projecting shafts rotatably mounted in the passages to provide pivotal movement of the butterfly in the body. An annular elastomeric seat member of U-shaped section covers the bore and the outer side faces of the body and the seat receives the shafts of the butterfly and includes at each of the passages a portion of spherical shape substantially complementary to that of the cap section of the butterfly. The seat has a cuff portion surrounding the associated shaft and a support which is independent of the seat bears against the base thereof. The support is constituted of an elastic material housed in an annular groove provided in the body and the support has cuffed portions surrounding the shafts and permanently compressing the spherical portions of the seat against the respective cap portions of the butterfly to assure sealing towards the exterior of the passages for the shafts and, in closed position of the butterfly, the continuity of the sealing upstream and downstream of the butterfly on the seat.

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