I use a Shrader valve on my on inner tubes and have never had it fail, usaly the tube it self runs out of self sealing goop first or I get a really big hole poked in the tube. I use them at around 50 psi not sure what that is in bars.
Have you considered the foam type tubes? They are a solid block of dense foam so you don't inflate them. They are expensive but I've heard they last a long time.
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