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, whereby the valve insert has a flow-regulation spring acting on the second valve body, wherein a force provided by said flow-regulation spring and a force depending on the pressure being present downstream of the first valve body tend to move the second valve body in a first direction, whereas a force depending on the pressure being present upstream of the first valve body tends to move the second valve body in a second, opposite direction; characterised 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. 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, whereby the valve insert has a flow-regulation spring acting on the second valve body, wherein a force provided by said flow-regulation spring and a force depending on the pressure being present downstream of the first valve body tend to move the second valve body in a first direction, whereas a force depending on the pressure being present upstream of the first valve body tends to move the second valve body in a second, opposite direction; characterised 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. 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, whereby the valve insert has a flow-regulation spring acting on the second valve body, wherein a force provided by said flow-regulation spring and a force depending on the pressure being present downstream of the first valve body tend to move the second valve body in a first direction, whereas a force depending on the pressure being present upstream of the first valve body tends to move the second valve body in a second, opposite direction; characterised 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.