Why Air Release Valves and Deaerators are Non-Negotiable
Posted by: @allyfishI installed them at the top of a vertical riser pipe, so that they would be out of the flow stream and so air could settle out.
I think that's a key point.
An air-release valve should not only be at a high-point in the pipework, but also positioned clear from any flow.
You want the air to rise up through a bit of pipe before it meets the valve.
I have automatic air-release valves at the far ends of my UFH manifolds.
In my experience they do still purge air into the atmosphere with the cap still in place, provided it isn't screwed down hard.
The plastic cap isn't meant to be 'air-tight'.
Air escaping under pressure is still possible.
Yes, the automatic type can potentially jam.
I've had that happen one in the last 20-years.
And I now keep a spare on-the-shelf.
FWIW I'm in a soft-water area, with no limescale issues.
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