SYSTEM BALANCING BY TRV
 Having installed Drayton TRVs to a heating system, the balancing process takes place. Traditionally this would be done by using the lockshield to control flow through the radiator. By using the TRV body to regulate flow, you avoid unnecessarily re-balancing the system when a radiator has been removed during decoration.
A decorator is likely to remove a radiator by fully closing the valves at both ends to isolate it, without noting how far open the lockshield is. This means that when the radiator is re-fitted, the system is unbalanced.
You can avoid this by regulating flow using the interior of any Drayton TRV body and simply leaving the lockshield valve fully open.
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