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A Little steam help pls

Al Letellier_9
Al Letellier_9 Member Posts: 929
hard to say for sure from your sketch, but most likely it is being used as a vent/vacuum breaker. When the system is in start up mode, it will let air out into the return. It will close when steam gets there, and then open when things cool off, effectively acting like a vacuum breaker. I've seen this a lot in some 2 pipe systems here. Think like steam and check the direction of flow in the trap, that would be your first hint as to what and why.


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