Regulation valve for a liquid medium, especially for drinking water, comprising: a valve housing providing a valve inlet chamber and a valve outlet chamber; a valve insert being positioned within the valve housing, the valve insert comprising a valve plunger (19, 19') and a first spring element; a thermo element being positioned directly in the flow of the liquid medium and carrying the valve plunger (19, 19'), the thermo element provides a thermo element force acting on the valve plunger (19, 19',) depending on the temperature of the liquid medium within the valve housing, wherein the thermo element force provided by the thermo element is acting against the first spring force provided by the first spring element; a mounting support for the thermo element, the mounting support dividing the valve inlet chamber of the valve housing in a first valve inlet sub-chamber and a second valve inlet sub-chamber, wherein the second valve inlet sub-chamber is positioned between the first valve inlet sub-chamber and the valve outlet chamber; a second spring element being positioned in the first valve inlet sub-chamber and acting on the mounting support in such a way that the second spring element provides a second spring force which presses the mounting support against a stroke provided by the valve housing, characterized in that the thermo element force provided by the thermo element is acting against the first spring force provided by the first spring element in such a way that an increasing temperature of the liquid medium tends to open the regulation valve and that a decreasing temperature of the liquid medium tends to close the regulation valve; the valve insert further comprises a valve body, the valve body provides at least one relative large opening which is completely closed at relative low temperatures of the liquid medium and which is opened at relative high temperatures of the liquid medium; the valve body provides at least one additional, relative small opening which is open when the at least one relative large opening is completely closed and when the at least one relative large opening is opened. a valve housing providing a valve inlet chamber and a valve outlet chamber; a valve insert being positioned within the valve housing, the valve insert comprising a valve plunger (19, 19') and a first spring element; a thermo element being positioned directly in the flow of the liquid medium and carrying the valve plunger (19, 19'), the thermo element provides a thermo element force acting on the valve plunger (19, 19',) depending on the temperature of the liquid medium within the valve housing, wherein the thermo element force provided by the thermo element is acting against the first spring force provided by the first spring element; a mounting support for the thermo element, the mounting support dividing the valve inlet chamber of the valve housing in a first valve inlet sub-chamber and a second valve inlet sub-chamber, wherein the second valve inlet sub-chamber is positioned between the first valve inlet sub-chamber and the valve outlet chamber; a second spring element being positioned in the first valve inlet sub-chamber and acting on the mounting support in such a way that the second spring element provides a second spring force which presses the mounting support against a stroke provided by the valve housing, characterized in that the thermo element force provided by the thermo element is acting against the first spring force provided by the first spring element in such a way that an increasing temperature of the liquid medium tends to open the regulation valve and that a decreasing temperature of the liquid medium tends to close the regulation valve; the valve insert further comprises a valve body, the valve body provides at least one relative large opening which is completely closed at relative low temperatures of the liquid medium and which is opened at relative high temperatures of the liquid medium; the valve body provides at least one additional, relative small opening which is open when the at least one relative large opening is completely closed and when the at least one relative large opening is opened.