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Drain boiler to replace boiler drain?
The 1/4 turn boiler drain on my boiler is leaking from the stem. Nothing to tighten or replace, seems the ball and stem is totally sealed in the two halves of the casting.
On the attached sketch, the lower boiler drain is leaking. I can isolate the boiler itself by shutting the two gate valves. I am concerned about cracking the boiler if I drain out the water and then refill with cold water. I probably can rig up feeding the boiler from the hot water tank.
What I am hoping is, if I remove the lower boiler drain (after relieving the pressure), will the water will stay in the boiler (i.e. finger over the soda straw), since all the gate valves are closed? Will that work? It is 3/4" thread into the lower boiler.