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Steam boiler feeds automaticly (unwanted)

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Hello
I have a steam boiler that has a hot water feed (off the hot water heater). Between the hot water heater and boiler, I have a 1/4 turn valve that I open to feed the boiler with hot water when needed. Lately, the boiler has been getting feed water automatically. Is it common/possible for a 1/4 turn have a leak and cause this to happen?

Please let me know your thoughts.
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