Your suggestion of leaving the regulator pressure adjusting screw
engaged is incorrect and a fire and explosion safety hazard. Just
because you have not had a accident from this practice does not make
it safe. It is up to you whether you want to do some research about
this and maybe change your practice. However for your safety and
that of the people around you but I would suggest you do so.
The best source for this safety info is ANSI Z49.1;2005 Safety in
Welding, Cutting, and Allied Processes you can download it here
http://www.aws.org/technical/facts/Z49.1-2005-all.pdf Sections 10.7
and 10.8 cover the correct procedures for attaching regulators to
cylinders and setting up torches.
This is the proper sequence for setting up, lighting and shutting
down an oxy-fuel torch. Always use the following sequence and
technique for lighting a torch:
(1) Open fuel gas cylinder valve (acetylene 1/4 to 1/2 turn.
(2) Open fuel gas torch valve 1/4 turn.
(3) Screw in fuel gas regulator adjusting valve handle to working
(4) Turn off the fuel gas torch valve (this will purge the fuel gas
(5) SLOWLY open oxygen cylinder valve all the way.
(6) Open oxygen torch valve 1/4 turn.
(7) Screw in oxygen regulator screw to working pressure.
(8) Turn off oxygen torch valve (this will purge the oxygen line).
(9) Open fuel gas torch valve 1/4 turn and light with lighter.
NOTE Use only friction type lighter or specially designed lighting
device. NEVER use a butane lighter.
(10) Open oxygen torch valve 1/4 turn.
(11) Adjust to desired flame.
Always use the following sequence and technique for shutting off a
(1) Close fuel gas torch valve first, then the oxygen valve.
(2) Close fuel gas cylinder valve, then oxygen cylinder valve.
(3) Open torch fuel gas and oxygen valves to release pressure in the
regulator and hose.
(4) Back off regulator adjusting valve handle until no spring
tension is left.
(5) Close torch valves.
The buffer maybe the most dangerous tool we use on a personal level
but there is no doubt that the torch is the most potentially
destructive on a large scale. Be safe.
James Binnion Metal Arts