It might not be your regulator! My daughter experienced similar to
your described problem.
I caution you to take the following to your supplier of
welding equipment and use it only to form the basis of discussions to
help resolve your issue, Naomi Propane/LPG is very dangerous and you
need to check what I state below with the professionals that supplied
you the equipment. I am telling you this based on our experience with
our equipment which may well be different to yours.
A couple of things to have checked out.
Firstly the hose between the bottle and the hand piece needs regular
cleaning inside. The chemical in the propane (LPG) will contaminant
with the hose and produce residues which will cause irregular flame
Where we purchased our system from explained this to us and sold us
a small bottle fitted with a tight fitting tubular copper pipe gently
bent at 90 degrees, we are then able to squirt Shellite (Lighter
Fluid) down the hose to flush the hose.We removed the propane hose at
both ends then use the Shellite to flush out the hose. Shellite is a
very volatile liquid and needs to fully removed before you connect
the hose back up. Typically we blow at one end to remove any excess
Shellite then depending on the climate let the hose sit for a good
hour or so to allow the reaming Shellite to fully evaporate. Then
reconnect the hose.
Our supplier suggests the cleaning process be done once a week if
you use the system daily. If you only use in say weekly the supplier
suggested the excess Propane/LPG be let bleed from the hose system
and not to have the liquid gas sit in the hose thereby reducing the
contamination in the hose. You might be wondering where this built up
gas I mention comes from. in a system that as a normal bottle and
hand piece where you turn off the Propane/LPG at the bottle there is
no pressurised propane in the hose. In our system we have a safety
valve pressure sensing device fitted to our bottle which when you
turn the main tap off at the Propane/LPG with the safety device
fitted it retains a pressured with Propane/LPG in the hose, this can
take a good minute or 2 to be bleed out after you have turned the
main tap off assuming you have the hand welding valve fully on. More
on this later.
The other cause can be the bleed back valve which is fitted in the
hand piece, these are quite often the culprit. They can be replaced
however our supplier informed us these are a weak link however in a
basic stand system are required to remain fitted for flashback
Now please again seek some professional advise here with your
Propane/LPG welding equipment supplier this is very important and
take what I am about to tell you with extreme caution. Propane/LPG is
dangerous. That said the supplier of our equipment suggested we
remove this bleed back valve which prevents flash backs to the
propaneLPG cylinder, this was only done because our supplier had
fitted a safety device to the LPG cylinder that the hose connects
directly to that prevents the flash back, it also switches off the
LPG to the hose should the hose get damaged and it senses no back
pressure. Our supplier fully explained the dangers of not having the
bleed flashback valve without the special safety device fitted and
asked if we had only the one system so accidentally the hose and
fitting couldn’t be connect to a bottle without the bottle safety
device fitted. Once he confirmed this and was happy that we
understood the issues stated above he happily removed the back bleed
valve to the hand piece. Once these two measured were done then our
flame fluctuations disappeared.
Naomi check with you supplier who will know the rules and safety
regulations in your State and be guided by them… Hopefully the above
comments will help you with your discussions with them to more better
understand the issues you are experiencing and more quickly with
their assistance get them resolved.
Hope this is of some assistance. Have a Heppy New Year!