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Replacing old modulating valves
I have a system where a number of the B&B valves are leaking from the stem.
I read the article in the library on the Bishop & Babcock system and it states that they are a packless valve.
What are my replacement options? Would like to stay with a modulating valve like what is there now but I know that may not be possible.
Attached a photo of the valve. I’m not sure I have a full photo