Welding Equipment & Welding Supplies since 1993
Call Us On
0845 899 4400
01908 699802
0845 899 4400 | 01908 699802
Tel 01908 699802
(9am-5pm Mon-Fri)
Milton Keynes, United Kingdom
« Back to blog homepage

Setting up Oxy Acetylene Kit

Thursday, 19th March 2020
Graham (Tech Advisor)
The Welders Warehouse Online Shop

Setting up Oxy Acetylene Kit is not rocket science, but it is important to do it correctly.

All the following also applies to Oxy Propane and Oxy Propylene Kits

Setting up Oxy Acetylene Kit – the basics

  1. Oxy Acetylene fittings consist of a concave Female sealing face on one component and a Male ball shaped sealing face on the other.  A Nut clamps these faces together to form a gas tight seal. 
  2. Threads are not designed to be gas tight as gas will not come into contact with the threads.
  3. NEVER use PTFE tape or any other form of thread sealing product when setting up gas equipment.
  4. DO NOT over tighten joints, they only need to be nipped up, take special care if you’re using a large adjustable spanner as it’s easy to over tighten nuts if you’re using a spanner that was designed for use on the Forth Bridge assembly 🙂
  5. Combustible Gas fittings (Propane, Acetylene etc) will be LEFT HAND THREADS, this will be indicated by little nicks in the corners off the nuts.

Setting up Oxy Acetylene Kit

  1. Visually check the inside of the thread and seat of the Gas Cylinder outlet, you’re looking for dust, debris or scratches on female sealing face.
  2. Fit the Gas Regulator to the Gas Cylinder
  3. Fit the Flash Arrestor to the Regulator – Note, in North America, Flash Arrestors are fitted to the Torch, but here in Europe we fit them to the Regulator.
  4. Fit The Hose to the Flash Arrestor.  Note, it may be that both ends of your hose are the same size nut, allowing the hose to be fitted the wrong way round.  The Torch end has a Check Valve (one way valve), if the hose is fitted the wrong way around, you will not get any gas out!  Look at both ends of the hose, if the nuts are the same size, look behind the nut, if there is 5-10mm of brass bar between the back of the nut and the start of the hose, that will be the Check Valve and thus the Torch end of the hose.
  5. Fit your Gas Gun to the end of the Hose.

Setting Gas Pressures

  1. Check the valves on the Torch are closed.
  2. Check the Control Knobs on the Regulators are unscrewed to the point where they’re loose and a little floppy.
  3. SLOWLY open the Gas Cylinder Valves.
  4. Open the Torch Oxygen Valve 1/4 – 1/2 a turn (no gas will come out yet).
  5. Screw the Oxygen Regulator Control Knob Clockwise until you feel it start to go stiff. Continue turning while watching the Delivery Pressure Gauge on the Regulator. Continue turning the Regulator Control Knob until the desired pressure is reached.
  6. Turn OFF the Torch Valve.
  7. Repeat steps 4-6 with the fuel gas.
  8. Check all joints for leaks with a proprietary leak detector product.

Lighting Oxy Acetylene (or Propane/Polypropylene) Torch

  1. Imagine the Torch Gas Control Knob is the face of a clock. Open the fuel gas Torch Valve around 5 minutes.
  2. Light the gas with a Spark Lighter (Cigarette lighters should be avoided as they can be dangerous)
  3. Slowly open the Oxygen Torch Valve until the desired flame is achieved.

You’re now ready to get stuck into the job!  Always remember to use eye protection, even if you choose not to wear darkened goggles, you should at least wear clear goggles, as there is always a risk of sparks.

Shutting off the Flame

When you’ve finished the job:

  1. Turn off the Fuel Gas
  2. Turn off the Oxygen
  3. Be careful where you put the Torch as it is likely to be hot

End of Work Shutdown of Kit

  1. Close the Cylinder Valves
  2. Open the Fuel Gas Valve on your Torch until the Gauges on your Regulator drop to Zero, then close the Torch Valve again
  3. Repeat step 2 with the Oxygen Torch Valve
  4. Unscrew the Control Knobs on the Regulators until they go loose and slightly floppy

I hope you found this blog article about setting up Oxy Acetylene Kit useful, if things work out well for you, please feel free to post some pictures of your achievements on our Facebook Page

View our range of Oxy Acetylene Kits

Please let me know what you thought of this article by leaving a comment.  Don’t worry, your email address won’t be added to a database or shared and you won’t receive any unsolicited email.




  1. Chuan-fang says:

    hey Graham,

    thanks for the infomation you share about oxy-acetylene kit. It’s really helpful and solves some questions lasting long in my mind especially which gas to shut off first while fininshing the work.

    1. Graham says:

      Hi Chuan-Fang
      Thanks for the comment, good to hear you found my article about setting up Oxy Acetylene kit helpful.

  2. Chris Rogers says:

    Hi Graham, I am new to gas welding and i am a little confused as to the correct way to shut down the flame, some videos show shutting off the Oxygen first and then the fuel but you say turn off the fuel gas first. Is one way safer than the other?
    Thanks Chris

    1. Graham says:

      Hi Chris
      When I was taught at College (back in the middle ages 🙂 it was always Fuel Gas Off first.
      The reason being, Oxygen blows the flame out and clears the Torch of Fuel Gas.
      Shutting the Oxygen Off first means unburnt fuel gas in the torch can ignite, a Flashback!
      Hope this helps
      Cheers Graham

  3. Brian says:

    Hi Graham,
    So helpful, and really comprehensive. Clearly WW are committed to a high level of customer support. Many thanks

    1. Graham says:

      Thanks Brian, we do our best 😀 Graham

  4. Barry says:

    Thanks for all the information as custom building a Map Gas / Oxygen welding set up. Cleanliness and fits will be adhered to and checked fo leaks. The valves arnt dial type, but I’m sure with careful regulating of each valve and marking the knobs, I’m hoping for some element of success.

    1. Graham says:

      Thanks for the positive comment Barry, glad you found the article useful.
      Cheers Graham

  5. Patrick says:

    Awesome help..thx.
    Tutorial/training tool for workshop guys

    1. Graham says:

      Thanks for the comment, glad you found the article useful.
      Cheers Graham

Leave a comment

Your email address will not be published. Required fields are marked *