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Problem with bottom blow down drain
My approx. 30 year old Weil McLain single pipe steam boiler works pretty well. Original was likely coal fueled, this one is natural gas. Several years ago, The Wall helped me get it into shape. Now, a new issue: The bottom drain outlet (regular gate valve) doesn't open, so I can't drain the dirt / crud from the bottom of the boiler. I can turn the handle, but nothing opens up and nothing flows out. Should I attempt to repair the gate valve? How? Or...Should I replace it with a new duplicate or with a ball valve? Any suggestions and precautions would be greatly appreciated. Thanks.