Perfex Series 155 Magic Dial Thermostat
Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Danfoss RA Valve Engineering Data
This literature from Danfoss about the RA thermostatic operators and RA valves is no longer in print. Thanks to Bill Burton of Danfoss for scanning it and sharing it with us.
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