If the valve on your radiator is not a thermostatic one, you can replace the old hydraulic valve and then install the Smart Valve (see image below).
IRSAP offers a full range of thermostatic valves, suitable for all hydraulic heating systems. However, we recommend the replacement work to be carried out by a professional: to replace the hydraulic valves or request a simple advice on those most suitable for your system, you can contact us at firstname.lastname@example.org.
This is a valve in which the water flow can only be managed manually, as if it were a tap that can simply open/close the water flow in the radiator. Generally, manual valves have a central screw, as in the enlarged image, and the knob may not be removable.