I am still looking into getting a OA setup and I am continuing to do online research on safety.
A recommendation that I often see is to use flashback arrestors at the regulators and check-valves at the torches. I have inquired about the torches of a well known european QA equipment manufacturer and their torch did not have a check-valve in it. Instead, this manufacturer had special flashback arrestors, which also included a check-valve and a third thermal safety feature which cut gas if a certain heat is detected. Their recommendation is to use these flashback arrestors at the regulators and to not worry about a check-valves at the torch.
Is it safe to operate the torch this way, or should I install additional flashback arrestors (not for the arresting feature, but rather for the built-in check-valve functionality) at the torches?