The TRV (Thermostatic Radiator Valves) is a valve that self-regulates, meaning it adjusts the flow of water into your radiator depending on the setting. The thermostatic valve head goes on top of the valve body. As the room temperature changes, the valve head expands, adjusting a pin in the valve body so that it opens or closes.
These valves along with new thermostats play a big part in having an efficient heating system. Need some TRV valves adding to your radiators, please message us for details.