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Orifised radiator valve and standard radiator valves comparison of

There has been some discussion about orificed radiator valve and pictures of ancient radiator valves.

The Dunham company now named Mepco makes orificed radiator valves that can be used in any two pipe steam system.

See attached. If you purchase the valve be sure to ask for the tool needed to make the adjustment and huw many turns are needed to set the vale to the proper edr. once set no one can mess wiyth the setting and the valve can be be used a shut off.