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Tool Talk Discussion Forum

Re: Torch regulator question

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Author  [Modern View]

06-11-2013 05:21:24

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You stated you turn off the acetylene bottle first and open the acetylene torch valve to empty the acetylene line. Do you then close the acetylene torch valve? That sounds like where the problem might be.

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Stick welding

06-11-2013 17:55:34

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 Re: Torch regulator question in reply to JOB, 06-11-2013 05:21:24  
Doesn't matter. Torch handles should never let one gas flow into the other hose. It creates a very dangerous situation. That's why check valves and/or flashback arrestors are often required to meet safety regulations. The only place the gas should go is out the tip.

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06-11-2013 18:45:32

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 Re: Torch regulator question in reply to Stick welding, 06-11-2013 17:55:34  
Nowhere in his post does he say he is using back flow preventers. Maybe a new torch set comes with them. I haven't had to buy a new set of regulators in the last 45 years.

This isn't worth mentioning to you, but if he doesn't have flash back arrestors and he did not close the acetylene valve on the torch handle. He then closes the oxygen valve on the bottle and opens the oxygen valve on the torch handle fast if he is running a lot of oxygen pressure, the oxygen could go back into the acetylene line.

Because of a situation like this is one of the reasons they made back flow preventers. I think the flash back arrestors have a back flow preventer built into it also.

Have a nice day Mr. Stick. Beat up some one else for a change.

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Stick welding

06-11-2013 19:22:42

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 Re: Torch regulator question in reply to JOB, 06-11-2013 18:45:32  
I wasn't beating up on anybody. I don't want to see someone get blown up. There's no way the acetylene gauge should go up when draining the oxygen with the cylinder closed. There'd have to be some kind of obstruction. He didn't say if he closed the acetylene valve after draining the hose. I would think most people close the valve after draining the hose though. Flashback arrestors do have check valves but most new torches come with one or the other. I've seen gauges on new torches that crept up but they were the cheap knock off sets. Still he should go back to where he bought it and find out what's wrong.

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06-12-2013 04:40:24

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 Re: Torch regulator question in reply to Stick welding, 06-11-2013 19:22:42  
The only way that gauge on the acetylene side can go up with the acetylene bottle shut off is with a bad torch handle valve, which isn't likely to be that bad, or else with the valve open.

I would expect the valve to be shut off also but that is the only way oxygen can get in that line and make the pressure build with the acetylene bottle turned off.

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