Old flair purge and balance valve


Old 01-14-17, 07:28 AM
Thread Starter
Join Date: Nov 2010
Posts: 18
Received 0 Votes on 0 Posts
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?
Attached Images  
Old 01-14-17, 06:06 PM
Join Date: Nov 2011
Location: USA
Posts: 423
Received 3 Votes on 3 Posts
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.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: