Acytelene gauge problem.

Just got my shop tanks exchanged. All went well initially but now when I open the acyt valve it immediately pegs the feed pressure adjustment gauge needle all the way into the red. Even if I just crack it slightly it pegs the gauge. Anyone know what could have happened to the gauge ?
 
(quoted from post at 02:53:18 08/18/17) Just got my shop tanks exchanged. All went well initially but now when I open the acyt valve it immediately pegs the feed pressure adjustment gauge needle all the way into the red. Even if I just crack it slightly it pegs the gauge. Anyone know what could have happened to the gauge ?
ounds like regulator went bad. Some have kits available for repair, some can't be found.
 
possible regulator failure allowing tank pressure to output side. DO NOT OPEN VALVE until checked out by qualified service person, there is a critical pressure on acytelene that it can self ignite or explode in your hose. I don't remember this but was cautioned about adjusting pressure to high for that reason. come on welding people keep the man safe.
 
Are you talking about the gauge on the low pressure side of the regulator or the high pressure side?

If you've backed off your regulator all the way and the low pressure gauge is pegged, you have a bad regulator. Get it fixed or replaced; acetylene is unstable over 15 psi. (In the tank, it's dissolved in acetone to keep it stable.)

If your high pressure gauge is pegging, check with your gas supplier. A full acetylene tank will be somewhere between 200 and 300 psi, depending on temperature.
 
Do not even open the valve on the tank. Get the regulator rebuilt. If you want scared or scarred watch som video of texas acetylene fire. The material can decompose into a waxy solid when allowed enough room and temperature. This transmission is exothermic, in a dramatic way until it explodes. Danger danger danger!!! Jim
 
You have turned the tank(regulator)psi up as you ran the tank out of gas.
With the tank valve off,open the torch and bleed the acetylene psi off. Turn the regulator screw out, Open the tank valve and your acetylene should read zero. Close the torch and it should still read zero.(If you do not get a zero reading the regulator is broken) Now turn the regulator screw in slowly, with the tank valve open about 1 turn. The line pressure gauge should rise,stop at 7-10lb. All of this applies only to the line psi side of the regulator(the gauge with the RED warning in it. I think some are misreading you question.
 
I agree with 504 on this. You just need to readjust the regulator back to a lower output pressure.

If you did not adjust it up as you where running out then get it repaired or replaced.
 
Screwed all the way out the gauge still pegs the needle. Opening the gas on the torch, the needle drops but will not adjust anywhere 7 pounds where I keep it all the time.
 
Your acetylene regulator needs to be rebuilt or replaced.It is strongly suggested that after using your oxygen/acetylene torch to turn off the tank valves. Then open the acetylene valve on the torch and bleed out all the gas in the line until both gauges reads zero. then back off the regulator adjusting screw. Then do the same on the oxygen side. The tank valve should not be turned on with the line pressure adjusting screw screwed in. Regulators have a shorter life by not bleeding lines and backing off regulator screws. I believe it is also done for safety. There is a shop in St. Paul MN. that fixes oxygen/acetylene regulators.
 
(quoted from post at 23:40:06 08/18/17) Screwed all the way out the gauge still pegs the needle. Opening the gas on the torch, the needle drops but will not adjust anywhere 7 pounds where I keep it all the time.

Probably none of my business, but 7lbs of acetylene is more than you need. Perhaps you're cutting or heating material thicker than 1/2".
 
Yes you need to rebuild or buy a new regulator. We see a lot of blown regulators when people keep raising the regulator psi as they run low on gas,then they put on a new tank and open it wide open and all 2200#(oxygen) hits and blows out the regulator.
And some time nobody does anything wrong, they just wear out and blow the diafram.
 

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