Abstract: The invention refers to a slide-gate shut-off device made of refractory material, of the type having a fixed holed refractory plate (30), a sliding holed refractory plate (40) and underneath the latter solidly joined to it (50), above the fixed refractory plate (30) a fixed refractory sleeve (20), also known as the internal pouring appliance, around which a pouring-appliance holder (11-12) is arranged.According to the invention, these refractory plates (30, 40) are holed in the center and have a double symmetry; furthermore, said internal pouring appliance (20) becomes gradually thinner towards the top, and at its lower base has a radial thickness approximately double that of the lower sliding refractory sleeve (50), known as the external pouring appliance, the radial thickness of which is approximately equal to the radius R of the casting holes in the refractory plates (30, 40).

Abstract: This invention refers to a slide-gate pouring appliance for ladles and similar devices. The slide-gate pouring appliance according to the invention is of the type having:a first fixed metal frame, solid with the bottom of a ladle, to which a first holed refractory plate is secured,a second metal frame, removable and tilting, hanging with a clearance from said fixed frame and supporting by means of suitable guides:a third metal frame (to which a second refractory plate, called the mobile plate, holed, is secured) capable of sliding between a first working position in which the holes in the fixed and mobile refractory plates are aligned and a second working position in which the holes in the fixed and mobile refractory plates are on different axes and do not coincide with one another.This type of slide-gate pouring appliance necessarily has a locking device to press the two refractory plates, one fixed and one mobile, into contact with one another and hold them there.