An inlet valve with a container and control apparatus for introducing a powdery substance into a liquid added to the container of a mixing device, said valve being designed as a lifting valve, • with a container floor (100.2) formed on the container and connected to a container shell (100.1), a valve housing of the inlet valve arranged on the container shell (100.1) or container floor (100.2) and having a valve closing element, • with a valve seat in the valve housing, • with a valve disc that is formed on the valve closing element and interacts with the valve seat, • with the valve seat that forms a seat opening through which the powdery substance is introduced into the liquid, • with the seat opening that can be adjusted with the valve disk either between a completely closed closed position or completely opened open position, • with the valve closing element which is configured at least in its region acted upon by powder as a cylindrical rod having the same diameter, on which the valve disk having the same diameter is molded, • with the valve closing element whose end valve disk is withdrawn from the region of the valve housing through which the powdery substance fully flows when the inlet valve is in the completely open position, • with the control apparatus assigned to the inlet valve, • with the seat opening that is arranged in, and flush with, a region of extension of a wall of the container shell (100.1) or the container floor (100.2), • with the valve closing element that can be transferred by the control apparatus into the closed or into the open position, • with the control apparatus that has at least one signal pickup, • with the at least one signal pickup that is a measuring apparatus for the mixing parameters of the composition and quality of the powdery substance, the flow of the powdery substance in the inlet valve, the pressure in the container in the region of the seat opening and/or the temperature of the liquid, • wherein the closed or the open position of the inlet valve can be actuated during introduction depending on the mixing parameters. • with a container floor (100.2) formed on the container and connected to a container shell (100.1), a valve housing of the inlet valve arranged on the container shell (100.1) or container floor (100.2) and having a valve closing element, • with a valve seat in the valve housing, • with a valve disc that is formed on the valve closing element and interacts with the valve seat, • with the valve seat that forms a seat opening through which the powdery substance is introduced into the liquid, • with the seat opening that can be adjusted with the valve disk either between a completely closed closed position or completely opened open position, • with the valve closing element which is configured at least in its region acted upon by powder as a cylindrical rod having the same diameter, on which the valve disk having the same diameter is molded, • with the valve closing element whose end valve disk is withdrawn from the region of the valve housing through which the powdery substance fully flows when the inlet valve is in the completely open position, • with the control apparatus assigned to the inlet valve, • with the seat opening that is arranged in, and flush with, a region of extension of a wall of the container shell (100.1) or the container floor (100.2), • with the valve closing element that can be transferred by the control apparatus into the closed or into the open position, • with the control apparatus that has at least one signal pickup, • with the at least one signal pickup that is a measuring apparatus for the mixing parameters of the composition and quality of the powdery substance, the flow of the powdery substance in the inlet valve, the pressure in the container in the region of the seat opening and/or the temperature of the liquid, • wherein the closed or the open position of the inlet valve can be actuated during introduction depending on the mixing parameters.