Filling valve for a flushing cistern, the filling valve comprising a channel which has an access at its first channel end for connection to a water line and which has an outlet opening at its second channel end for discharging a water jet, a valve being arranged in the channel which can be actuated by means of a float, an immersion tube being arranged at the outlet opening, which immersion tube extends downwards from the outlet opening along a vertical direction and which encloses, with its immersion tube wall, a clear cross section perpendicular to the vertical direction, wherein the immersion tube has a wall opening in its immersion tube wall in the vertical direction below the outlet opening of the channel, which wall opening extends along the vertical direction over at least 2 cm and has an area of at least 100 mm 2, wherein the outlet opening opens into the immersion tube and the diameter of the outlet opening is less than the diameter, in particular less than 80 % of the diameter of the immersion tube at its vertical end facing the outlet opening, the filling valve having a pressure chamber which has an access opening for feeding water which has entered the filling valve through the access into the pressure chamber and which has a first and a second outlet opening, wherein a valve element connected to the float is arranged at the first outlet opening and wherein a main valve element is arranged at the second outlet opening, wherein in an open position of the valve the valve element connected to the float is spaced from the first outlet opening and in a closed position of the valve the valve element connected to the float is pressed by the float against an edge surrounding the first outlet opening and closes off the first outlet opening, wherein in the closed position, a water pressure built up in the pressure chamber presses the main valve element against a valve seat provided in the channel and thereby closes the channel at the level of the valve seat, wherein in particular the diameter of the first outlet opening is less than 10% of the diameter of the channel at the level of the valve seat. wherein the immersion tube has a wall opening in its immersion tube wall in the vertical direction below the outlet opening of the channel, which wall opening extends along the vertical direction over at least 2 cm and has an area of at least 100 mm 2, wherein the outlet opening opens into the immersion tube and the diameter of the outlet opening is less than the diameter, in particular less than 80 % of the diameter of the immersion tube at its vertical end facing the outlet opening, the filling valve having a pressure chamber which has an access opening for feeding water which has entered the filling valve through the access into the pressure chamber and which has a first and a second outlet opening, wherein a valve element connected to the float is arranged at the first outlet opening and wherein a main valve element is arranged at the second outlet opening, wherein in an open position of the valve the valve element connected to the float is spaced from the first outlet opening and in a closed position of the valve the valve element connected to the float is pressed by the float against an edge surrounding the first outlet opening and closes off the first outlet opening, wherein in the closed position, a water pressure built up in the pressure chamber presses the main valve element against a valve seat provided in the channel and thereby closes the channel at the level of the valve seat, wherein in particular the diameter of the first outlet opening is less than 10% of the diameter of the channel at the level of the valve seat.