Flow regulation valve for liquid conduction heating and cooling installations, comprising a valve housing providing a valve inlet, a valve outlet and a connection port which is arranged between the valve inlet and the valve outlet; a valve insert accommodated within the connection port of the valve housing, the valve insert having a valve insert housing; a first valve body carried by a valve stem, wherein said first valve body provides a shut-off function when the valve is closed and a flow pre-setting function when the valve is opened; a second valve body, wherein said second valve body provides a pressure-independent flow-regulation function when the valve is opened to keep the flow constant independent from the pressure being present upstream of the first valve body and/or downstream of the first valve body; a diaphragm connected to the second valve body, wherein the pressure being present upstream of the first valve body is guided through a channel of the valve stem to a first side of the diaphragm, and wherein the pressure being present downstream of the first valve body is guided through at least one opening in the second valve body to a second side of the diaphragm; characterized in that a first valve seat for the first valve body and a second valve seat for the second valve body are both provided by the valve housing; the valve housing has a conically shaped inner surface contour providing the second valve seat, wherein the first valve seat is proximate to the second valve seat; the valve insert has a flow-regulation spring acting on the second valve body, wherein a second end of the flow-regulation spring is supported against the inner surface contour of the valve housing that provides the second valve seat and the first valve seat. a valve housing providing a valve inlet, a valve outlet and a connection port which is arranged between the valve inlet and the valve outlet; a valve insert accommodated within the connection port of the valve housing, the valve insert having a valve insert housing; a first valve body carried by a valve stem, wherein said first valve body provides a shut-off function when the valve is closed and a flow pre-setting function when the valve is opened; a second valve body, wherein said second valve body provides a pressure-independent flow-regulation function when the valve is opened to keep the flow constant independent from the pressure being present upstream of the first valve body and/or downstream of the first valve body; a diaphragm connected to the second valve body, wherein the pressure being present upstream of the first valve body is guided through a channel of the valve stem to a first side of the diaphragm, and wherein the pressure being present downstream of the first valve body is guided through at least one opening in the second valve body to a second side of the diaphragm; a valve insert housing; a first valve body carried by a valve stem, wherein said first valve body provides a shut-off function when the valve is closed and a flow pre-setting function when the valve is opened; a second valve body, wherein said second valve body provides a pressure-independent flow-regulation function when the valve is opened to keep the flow constant independent from the pressure being present upstream of the first valve body and/or downstream of the first valve body; a diaphragm connected to the second valve body, wherein the pressure being present upstream of the first valve body is guided through a channel of the valve stem to a first side of the diaphragm, and wherein the pressure being present downstream of the first valve body is guided through at least one opening in the second valve body to a second side of the diaphragm; a first valve seat for the first valve body and a second valve seat for the second valve body are both provided by the valve housing; the valve housing has a conically shaped inner surface contour providing the second valve seat, wherein the first valve seat is proximate to the second valve seat; the valve insert has a flow-regulation spring acting on the second valve body, wherein a second end of the flow-regulation spring is supported against the inner surface contour of the valve housing that provides the second valve seat and the first valve seat.