Ball valve comprising: - a valve body that delimits at least one sealing seat (4, 4', 46), a ball seat and at least three fluidic ducts (8, 8', 8") that converge in the ball seat; - at least one hollow ball, received in the ball seat and movable with respect to the valve body to allow/prevent a fluidic communication between said fluidic ducts (8, 8', 8"), for example between pairs of ducts; - two or more sealing elements (10, 10', 12), at least one of which is placed in the sealing seat (4, 4', 46), in abutment with said ball; wherein only one of said fluidic ducts acts as an introduction duct of the sealing element (10, 12) and of the hollow ball inside the valve body, for positioning said element (10, 12) and said ball respectively in the sealing seat (4, 4', 46) and in the ball seat; - a ball-compressing element delimiting a further sealing seat to receive the other sealing element and connected to the introduction duct of the valve body to press said element against the hollow ball; wherein the valve body delimits three sealing seats (4, 4', 46), and wherein said ball valve comprises sealing elements (10, 12) in equal number with respect to the number of such seats (4, 4', 46); said ball valve being characterized in comprising: - a reinforcement element coupled to one or more sealing elements, at least partially inserted into the sealing seat (4, 4', 46) to limit deformation of said sealing element upon movement of the hollow ball in the ball seat; the reinforcement element being at least partially received in the sealing element and, with respect to a development axis (X, X', X") around which one or more of said fluidic ducts (8, 8', 8") develop, the reinforcement element being arranged only radially internally with respect to the sealing element. - a valve body that delimits at least one sealing seat (4, 4', 46), a ball seat and at least three fluidic ducts (8, 8', 8") that converge in the ball seat; - at least one hollow ball, received in the ball seat and movable with respect to the valve body to allow/prevent a fluidic communication between said fluidic ducts (8, 8', 8"), for example between pairs of ducts; - two or more sealing elements (10, 10', 12), at least one of which is placed in the sealing seat (4, 4', 46), in abutment with said ball; wherein only one of said fluidic ducts acts as an introduction duct of the sealing element (10, 12) and of the hollow ball inside the valve body, for positioning said element (10, 12) and said ball respectively in the sealing seat (4, 4', 46) and in the ball seat; - a ball-compressing element delimiting a further sealing seat to receive the other sealing element and connected to the introduction duct of the valve body to press said element against the hollow ball; - a reinforcement element coupled to one or more sealing elements, at least partially inserted into the sealing seat (4, 4', 46) to limit deformation of said sealing element upon movement of the hollow ball in the ball seat; the reinforcement element being at least partially received in the sealing element and, with respect to a development axis (X, X', X") around which one or more of said fluidic ducts (8, 8', 8") develop, the reinforcement element being arranged only radially internally with respect to the sealing element.