Thread: Making An Upright Air Commpressor From An Old LPG Gas Bottle.

Originally Posted by wm460

I tried to take the valve off but I can’t budge it so will have to leave it.
I noticed that this is extremely easy to press down don’t know if this is normal or if it’s bugged.

There may be two reasons for this.

Have you taken into account that the cylinder thread will be Left Hand. Fuel gas cylinders are Left hand Thread.
I have removed valve bodies from half a dozen 9 kg cylinders- all LH thread.

The brass valve bodies are often held by Loctite or similar and really take some moving.

One sneaky trick is to use a large capacity electric soldering iron to heat up ( and soften ) the Loctite for 10 mins or so.

I have made up a fitting which drops across the valve body and has a long handle welded to it.Just welded flat bar sections that drop over the valve body.

Apart from that the only other problem is holding the cylinder in position so it won't turn as you apply leverage to it.
Ratchet straps around the cylinder and a fence post will do it.

I hope it helps.

Grahame

Originally Posted by Grahame Collins

The brass valve bodies are often held by Loctite or similar and really take some moving.
One sneaky trick is to use a large capacity electric soldering iron to heat up ( and soften ) the Loctite for 10 mins or so.

I had the same problem and used a hot air gun with a restricted outlet, I have one that supposed goes to 650ºC and it certainly did the trick

Originally Posted by Grahame Collins

Have you taken into account that the cylinder thread will be Left Hand. Fuel gas cylinders are Left hand Thread.
I have removed valve bodies from half a dozen 9 kg cylinders- all LH thread.

After seeing your post you had me thinking how I ever converted my 9kg cylinder, I checked my converted one and it is a standard brass 3/4 BSP pipe fitting in it.
I then assumed that I must have tapped it and not remembered it, but then checked the two swap and go BBQ cylinders I have and both of them are right hand thread.

Originally Posted by Grahame Collins

Have you taken into account that the cylinder thread will be Left Hand. Fuel gas cylinders are Left hand Thread.
I have removed valve bodies from half a dozen 9 kg cylinders- all LH thread.
Grahame

I believe all Primus cylinders are also exceptions to this rule and have right hand threads.

Frank.

Originally Posted by Grahame Collins

Have you taken into account that the cylinder thread will be Left Hand. Fuel gas cylinders are Left hand Thread.
I have removed valve bodies from half a dozen 9 kg cylinders- all LH thread.

Grahame

Are you sure?

The hose connection to all flammable gas cylinders are all LH threads but the actual valve group connection to the vessel are a standard RH thread.

Edit: LH threaded connections have a V groove machined around the circumference of the hex spanner connection as an identifier.

Simon



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Deleted post. Made a mistake. See above post.