My c/h system has thermostatic valves on the incoming side of each radiator with the other side having the lock shield valve. So that I don’t have to make changes, is it acceptable to open the lock shield valves fully and use the thermostatic valves as the new lock shield valves.

James M. Donohoe.

  • Tony Taylor


    The short answer is no. The lockshield vale and thermostatic radiator valves do different jobs.

    The lockshield is designed to set the amount of flow through the radiator, this should be set by the installer balancing all the radiators in the house, so they all have the same temperature differential across radiator flow and return connections.

    The thermostatic radiator valve opens and closes the flow to the radiator, depending on the ambient room temperature.

    See for further details.

    Hope this helps.


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