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I am installing zone valves but want to isolate each loop with ball valves. can I use regular plumbing ball valves for this. Max temp would be 180 F.

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    Look at product specs. Most are rated at 200F or higher. Many are 400.
    – isherwood
    Commented Nov 11, 2020 at 22:05
  • Commonly metal + teflon (PTFE) so temperature limits are quite high, indeed.
    – Ecnerwal
    Commented Nov 11, 2020 at 22:12

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You're fine

Ordinary WOG (water, oil, gas) rated, metal-bodied ball valves are going to be rated for hydronic temperatures and beyond; if you want to make extra sure, you can check the specifications of the valve you're looking at for a WSP (Working Steam Pressure) rating, which a typical ball valve (using the Watts LFFBV as an example) will have as well. (Obviously, a plastic-bodied valve is going to have a much lower working temperature rating, and no WSP rating for that matter.)

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  • So then is the only reason the handles may be blue or red is to help you identify a hot or cold valve when it's installed?
    – SteveSh
    Commented Nov 12, 2020 at 0:52
  • @SteveSh -- for bog-standard metal-body valves, yeah (many are other colors, I know most of the ones in my house have yellow handles for instance) Commented Nov 12, 2020 at 1:02

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