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Anyone recognize these?

Steve Minnich
Steve Minnich Member Posts: 2,650
A friend of mine sent me these pics.

I’ve seen some really old B&G zone valves and these don’t look anything like them. They’re decommissioned on an operating radiant system, in series with two pumps in the boiler room.

Numbers on them are SDV-61.

Motorized checks?
Author - Hard Knocks: My Life Inside Boiler Rooms
PHC News Columnist
Minnich Hydronic Consulting & Design, LLC


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