boiler release valve

[jubjubpatt]

i have a gas-fired,automatically fed, hot water/cast iron radiator system…the pressure relief valve continuously dribbles water when ever the boiler is firing… i have replaced the valve and had the incoming water pressure checked… strangely, i never have any water in the expansion tank…aside from lowering the aquastat setpoint is there anything else i should check/correct? thank you

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