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Problems with Open radiant floor system
I'm having problems with a spring check valve in an open radiant floor system (potable, combined DHW). The original swing valve failed a few years ago, so it was replaced with a spring check. That valve has now failed as well.
The cause of the failure on this recent one is excessive build-up in the spring check (doesn't seem to be substantial build-up anywhere else that I've seen, the check valve is in about the hottest part of the system, so this seems to make sense), so thinking that the city water is in need of some filtration and/or softening?
So a couple questions. It is my understanding that bronze/SS circulators are recommended for open systems for corrosion resistance. Would bronze be preferred for this check valve over brass? The current failed one is brass. I was thinking of using a Nibco 1" lead free bronze spring check. Def higher quality than the current cheapo one as well.
Is there anything else you can do to resist corrosion on a part like this? Some sort of treatment or anything?
I know next to nothing about filtration/softening systems. Any advice/recommendations? I was thinking at least a simple charcoal filter or something to catch any sediment etc (Pittsburgh has a very old infrastructure, so might be some nasty stuff coming in from the street), then a simple softening system (don't think the city water is particularly hard, but the deposits in my check valve seem to indicate that there's enough to need some remediation).
Any other suggestions for how to best deal with this problem? When that valve fails, cold water can go straight to the hot fixtures, which is obviously a big problem.
This is the basic schematic of the system: http://radiantec.com/systems-sources/open-system.php
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