Update to design section
Commonly referred to as TRVs, Thermostatic Valves control the amount of water that enters a radiator. However the main difference between TRVs and manual valves is that TRVs are able to self-regulate. They can take into account the room temperature to ensure the radiator works towards a maximum room temperature, ensuring maximum levels of efficiency are adhered to in the process, helping you to save money on your heating bills.
These valves are used to control the amount of water that flows out of the radiator into the return pipework. This allows you to "balance” the radiator, ensuring the water is distributed evenly across your property and helping your radiators to heat up at the same rate.
An engineers valve, as the name suggests the customer cannot alter the flow rate using this valve as they are for engineers to balance the system and require a specialist key to access the spindle to control the valve.
These more traditional valves can be operated using the same Principals as a tap. You simply turn the top of the valve to allow more or less water to enter your radiator