Rich, I do not know about the GAZ containers, but the American style disposable Propane containers have a check valve that can be removed with the same type tool used to remove the valve stem from an automobile tire. The threads are Right-handed in these bottles. Al Messer --- "R.L. Roebuck" <rlr20@xxxxxxxxxxxxxxxx> wrote: > Hi there All, > > I know this request is going to generate a flood of > "that's" dangerous" > and "needs to be done with care" e-mails, so before > I even ask the > question, let me just point out that we're a group > of experienced > engineers, and out Health and Safety person here is > working with us > (however that doesn't of course make us immune from > something going > wrong). > > We need a small air vessel for just a few weeks of > use, but the air vessel > needs to have a large opening at one end. > > It's been suggested that we use one of the old thick > walled blue Camping > Gaz butane cylinders, to the 1970's design, of which > I have a few spare. > > We've vented the cylinder and washed it out twice > with water (and I can > see why you'd want to do that - even after venting > for 12 hours, when it > had been closed again for 12 hours, the smell of gas > from it again was > quite bad). > > So here's the question - how do you remove the brass > insert which forms > the check valve, which I presume is screwed into the > top of the steel gas > cylinder? We don't have a special fitting to go on > the castellations > around the brass inserts outside, also we don't know > if it's a left of > right handed thread. > > I'm not keen to attempt anything before speaking to > someone who's done it > before, and perhaps suprisingly, perhaps not, I > couldn't find any web > pages on anyone who'd done it before. > > It's been suggested we could drill it out, or > machine the top off, but I'm > reluctant to do anything like that - I'd much prefer > to gently unscrew it > incase there are any hidden nasties lurking within > it. > > Does anyone have any thoughts, cautions, warnings, > advice? > > Yours, > > > Rich. > MODEL ENGINEERING DISCUSSION LIST. > > To UNSUBSCRIBE from this list, send a blank email > to, > modeleng-request@xxxxxxxxxxxxx with the word > "unsubscribe" in the subject line. > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.