A ball valve or ball valve, a mechanism stopcock which serves to regulate the flow of a fluid channeled and is characterized in that the regulating mechanism positioned within shaped area perforated. It is opened by rotating the shaft attached to the perforated ball or ball in such a way that it allows the passage of the fluid when the perforation is aligned with the inlet and outlet of the valve. When the valve is closed, the hole will be perpendicular to the inlet and outlet. The position of the actuating handle indicates the valve status (open or closed). This type of valves does not offer precise regulation when being ¼ of a turn. Its advantage is that the perforated ball allows the direct circulation in the open position with a much lower loss of load than those of the seat, and cuts the pitch when the handle 90 ° is turned and closes the duct.