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Dish Head is also called Spherical Head with flanged edge. It consists of a sphere, a straight edge of a cylinder at a certain height and a transitional part whose radius of curvature is much smaller than that of the sphere a sphere. Dish Head is a continuous surface, at the junction of three parts. There is a sudden change in the radius of the meridian curvature . Compared with elliptical head, the stress distribution is not as uniform as it is. But the machining is easier.