Elliptical head is also called elliptical head, and elliptical head is the head composed of two parts: rotating elliptical sphere and cylindrical straight segment. Its function is 1. pipe end, not ready to extend, with the head welded to the pipe, as an end to use. 2. used in the pressure vessel, the upper and lower each have a head, the middle is a straight section, as a pressure vessel jar. The elliptical head with a long and short axis ratio of 2 of a rotating elliptical spherical bus is customarily called a standard elliptical head. The mechanical properties of elliptical heads are only inferior to those of hemispherical heads, but better than dished heads. Because the depth of the ellipsoidal head is between the hemispherical and dished head, the requirements for the stamping equipment and die are difficult to manufacture, which is easier than the hemispherical head and harder than the dished head. In recent years, due to the spinning manufacturing process, it is convenient for manufacturing large diameter elliptical head. Elliptical head is widely used in medium and low pressure vessels because of its good comprehensive performance