Thermostatic Radiator Valve (TRV)

A self-regulating valve fitted to the inlet pipe of a radiator that automatically restricts hot water flow as the room reaches the set temperature. TRVs help reduce energy consumption by allowing different rooms to be heated to different temperatures. Faulty TRVs can stick open (causing overheating) or closed (causing no heat); the pin inside the valve head commonly seizes in older valves and can often be freed without replacing the entire valve.