Take the safety release out, clean the surfaces and try it again. 2 out of 3 valve leaks I've had were due to grit in the valve. As far as testing goes, most likely they didn't run the pressure as high as you did. I have two kegs that "relieve" around 40 PSI and another that just touching the relief makes it vent, but as long as you don't touch it, no problem.
Let your supplier know, maybe they'll send you a valve free.
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