If you have flashback arrestors, you do not need check valves. Flashback arrestors are better placed close to the torch than at the regulators/tanks. A lot of times, flashbacks go up the oxygen side. A flashback arrestor placed near your torch will save your line, in addition to keeping your machine from being burned. The downside is that they restrict flow. A flame stop might be a better option for the concentrator side.
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Kimberly
working glass since 1990 - melting it on a torch since 2002
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