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Torch regulator question

L

ldj

Well-known Member
Just bought a new set of oxygen acetylene regulators. I turn off the acetylene bottle then open torch to get everything to 0lb. Then turn off oxygen bottle but when I go to open torch it puts pressure on the acetylene gauge. If I open fast it will push acetylene gauge way up. I never noticed this on old gauges. Is something wrong?
 
YES SOMETHING is wrong. It has to be in the mixer or an O ring. This is an explosion waiting to happen, have the touch checked by a repair shop fast.
 
Something is very wrong. DON'T USE YOUR TORCH! The
last thing you ever want is for the oxygen and
acetylene to get into each others hose. Take your
torch set and hose and get your money back. What
brand is it anyway, so no else buys one?
 
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.
 
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.
 
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.
 
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.
 
By now you have read the answers and most are right, but do not play around with it to see what might work, OX & AC mixed just right will explode without a spark. Back flow valves are not the cure, you need to get it fixed then check the valve. I deal with this stuff everyday for a living too.
 
Thanks all,
I will have them checked out for sure. I bought them off ebay nearly a year ago and haven't connected them till other day. They are China made, no name. I have read a lot before I bought and no one talked about danger. I think I must have something wrong with this specific set. I'm pretty sure it isn't all of them or you would hear a lot about them blowing up.

OH BTW I am not professional, I use in my shop for private use. I did go to a short adult education on using the torch at the local high school about 30 years ago.
 
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.
 
The gases do mix in the torch as in a Victor where they go through a spiral thing to mix even better than most other torches. That fact that it can do what you said shows it has an unrepairable defect within the torch itself . I would discard the torch ,keep the hoses, buy a Victor and install the suppressors. The torch at this point is unservicable.
 
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