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Posted by Harold hydronicnetwork.net on December 29, 2003 at 10:36:17:
In Reply to: Re: banging posted by eburke on December 28, 2003 at 20:08:53:
Don't misinterpret the suggestions. DO NOT put a ball valve in the steam line ANYWHERE. The suggestion to use the ball valve was to put it on the steam VENT RISER just under the vent to control the speed at which the air leaves the VENT.
The additional information describing that steam and water does not spray out of the vent riser, while the main vent is off, is a good sign that there is no thrashing in the line.
As yet, you have not described whether you have a wet return at the end of each steam main, or the system is a counterflow one-pipe steam system. As you mention a copper line, the system probably has a wet return and is not counter-flow. Puddling condensate hitting the end of the main by the return can cause the bang if the main venting is too quick.