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\"internal siphon\" gauge on my steam boiler

There is a gauge on my old steam boiler labled "internal siphon". It runs around 13PSI when my boiler is really cranking. Is this the same as the steam pressure I read about which should be like 2 pounds or less? My pressuretrol is cranked way down, although I don't really understand that whole concept. What is internal siphon pressure?
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