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Posted by Tom Stanton on April 20, 2002 at 08:40:50:
In Reply to: non return valve in main steam line produces sound of strikig with its seat posted by zaib on April 20, 2002 at 08:11:27:
Is the boiler connected in battery with another boiler? If so, the boilers may not be operating at the same pressure. If the boiler in question drops below header pressure, the non-return valve will "rattle" every time it opens back up. Sometimes, boilers in battery will shift the load back and forth, particularly if the load demand is low.
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