Old flair purge and balance valve

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Old 01-14-17, 07:28 AM
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Old flair purge and balance valve

I have (4) old flair purge and balance valves on my boiler. I want to purge the air out of the loops on my boiler. There doesnt look as if there are any other valves on the system where I purge the air. I attach a hose to the the valve then open the nut next to the hose. When I do the water starts running out of the loop through the hose, but it sounds like the valve starts pulling in air around the nut I just opened. I filled up (3) 5 gallon buckets and there is still air purging out. Is anyone out there familiar with this valve?
 
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Old 01-14-17, 06:06 PM
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I've seen something like it before. The fitting on top appears to be your "isolation valve", you turn it until the slot is perpendicular to the direction of flow, which causes a butterfly-type disc inside the valve to also rotate into a perpendicular position, cutting off flow downstream of the hose bib.

You need to do that before you start actually purging.

Also, if the heat zone is controlled by a zone valve, then you also need to manually open that valve when you are purging.
 
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