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Posted by Harold Kestenholz - hydronic.net on April 27, 2002 at 10:13:09:
In Reply to: non return valve chattering in the main steam line of boilers while working on battry posted by ZAIB on April 27, 2002 at 10:01:48:
You will want to know the pipe arrangement of the battery as opposing flows can cast water into the steam flow from one boiler to the next, making variations in the pressures in part of the manifold. Sometimes lowering the water level to throw drier steam can stop chattering. Also you want to know if the valve can be opened or has some slack in the stem connection from hammering over time so it can move and make sound.
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