Honestly, the real test isn't just pressure holding, it's how those valves handle thermal cycling over time. Tbh, most failures I've seen come from repeated expansion and contraction weakening seals. Ngl, a lot of specs don't account for rapid temperature changes in real world setups. People forget that a dual-safe design can still have a single point of failure if the monitoring system isn't calibrated right.

Your 'back gave out' story hits home... mine did on a foundation pour, now I always crew up.