Responding to brass valves on propane
as a marine engineer, I can tell you temps of 110 degrees will not cause brass to malfunction. brass is used extensively in ship engine rooms that often exceed that temp, and in certain places 120 degrees. Even if it did, couplings have nothing to do with the valve itself not working.
Your problem is either in poor quality valves to begin with or as one person stated perhaps turning it the wrong way.
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