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The really old valves had a plug which was supposed to blow out to relieve excess pressure. It could indeed come out like a shot. Once I drilled the plug out and installed the nylon washer and burst disk below it. (Wanted to save the valve because it fit a pipe thread tank and they are getting hard to replace). This would still not be "legal" now as there has been a change to special bolt with 3 holes as opposed to the one for letting the gas escape. The rationale I heard was that the one hole could put out a jet in one direction, causing the tank to spin or otherwise flail around on the deck. There are kits available which will upgrade to the new design by replacing the special bolt, so if your old valve has the same threads for the burst disk assembly, you can "relegalise" it. Seems like I got a Sherwood one once. Have heard that burst disks are not required in the UK, lucky sods... Paul Smith On Fri, 22 Sep 1995, Simon Hartley wrote: > This may not be at all relevant but I recently had to retire a J valve on > my old steel 72 because the shop servicing it refused to fill the tank with > that valve on it. Reason being there were some metal plugs or something in > the little holes coming out of the burst disk. Apparently if the disk > blows these fragments are shot around the room and can cause injury. The > shop owner who I knew reasonably well (so I hope wasn't spinning me a line) > showed me a small number of older valves (not just j valves) that were no > longer "legal". I dare say if I'd taken the tank and valve away with me I > could have got it filled elsewhere (I noticed the other day after a fill > that one of my tanks was about 4 months out of test, woops!!) but I > replaced the valve anyway ($60 is cheaper than loosing an eye). I kept the > j valve as a spare. > > Anyway I thought it was worth a mention. The tank and hence the valve is > about 16 yrs old so knewer valves or other models probably aren't a > problem, may be worth checking with a reputable service provider though > (sorry I can't recall the model/brand). > > As an aside I can't remember why they're called j valves, there more of a > "t" shape. > > Simon > > "..fear creates it's own reality." - Simon L Hartley > > Kryton (programing time gauntlet): "...all that remains is for me to go > back in time and sacrifice myself so we can get ourselves into the mess > were in now... ...all in all todays been a bit of a bummer hasn't it > sir!!" > > ----------------------------------------------------------------------- > Simon L Hartley o o Oo o > Associate Lecturer in Resource Technology oo o o > Faculty of Resource Science and Management o oo _____ o oo > Southern Cross University o (_/-\_) oo > P.O. Box 157 ===(S) o > Lismore NSW, Australia 2480 > Ph: (066) 203 251 or (61 66) 203 251 > Fax:(066) 212 669 E-mail: shartley@sc*.ed*.au* > ----------------------------------------------------------------------- > > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. >
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