Which is why all oxy welding valves, regulators, and fittings are brass. And it looks like they use Oxygen "safe" o-rings and lubes just like we do.I just think of all my years working in body shops with Oxy/ acetaline torches, grease and oil, filth, combustibles everywhere, dirt, grime, etc.
Never seen one fire or explosion turning valves on or changing out tanks. Those welding regs, fittings, or torches aren’t always the cleanest things either.
Even the torch bodies are usually brass even though self ignition isn't a problem at the very low O2 pressures they are fed (1-2bar/15-30psi over ambient).