The only way you can have a tank and a concentrator hooked up to the same torch is to have the tanked hooked to your bigger outer flame and the concentrator hooked to your smaller inner flame. with our without foot pedal on the ouiter to conserver tanked o2 when not needed.
If you have a tank and a concentrator hooked up to the same line no matter what you do there is no fitting or plumbing thats going to easily change the fluid dynamics of the o2. If the pressure in the line from the concontraters is at al lower then the pessure the tanks reg is set at it. the tanks pressure will always over come the pressure of the conentrator, If the tank pressure is lower then the concentrator then the concontrater will be the dominitt force and inless the pressure ever drops below the tanks pressure the tank will not feed the line. Gas wants to always take the path of least resistance.
A back flow preventer will only keep the tank from filling up the holding tank in the concentrater to the pressure the tank is set at and visa versa.
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