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Mr. Bowers: Throw the cylinders out! They're more trouble than they're worth. There's plenty of steel 72s around with 3/4 NGS (straight thread with o-ring boss) ports. I could probably sell you one or two of mine. You can try ebay for complete tank/valves with straight thread valves. Sherwood, The Liberty Group, Genesis Scuba, or the former Sherwood distributers used to sell a standard valve that was turned down to 1/2 NPT and chrome plated, but it was outrageously expensive (as I recall dealer price was in the $50 range), and the availability was "catch as catch can". If you insist on turning down a 3/4 NGS valve, any professional machinist will have the specs and probably a ring gauge for 1/2 NPTF (aka "dryseal") pipe thread. A hobby machinist can look up the spec in either the Machinery Handbook or a hydraulic fittings catalog. A professional machinist will get about 1/2 to 3/4 hour setup time plus 1/2 hour for each valve, at a cost of at least $50 per hour. You will have a couple of problems with this job: 1. Most professional machinists won't do work like this (liability concerns). 2. Most dive shops won't fill a tank that has a modified valve or a modified port (if they know). There have been a couple of accidents related to things like this (European valve in a US tank or vice versa), and dive shop folks won't bother to draw the distinction between a hacked job and a professional job. 3. Dealing with that 1/2 NPT port on the tank makes it a real pain when it's time to inspect, or clean/tumble the tank. I hope this helps. Sincerely, C. Randy Bohrer Underwater Applications Corp voicemail/fax: (707) 222-7528 randy@mi*.co* <mailto:randy@mi*.co*> www.mixedgas.com <http://www.mixedgas.com> ------------ Original Message ------------------------- Message Display Date: Tue, 11 Apr 2000 08:57:00 -0500 From: Hungry Hill <hungryh@nc*.ne*> Subject: taper thread valves Does anyone have a source for yoke taper thread valves to fit a couple LP 72's? I know they're as rare as hen's teeth, but maybe someone has a stash out there somewhere. If not, can anyone tell me how to spec the threads to machinist to have some straight thread valves turned down? Thanks, Bruce Bowers film/video composer, multi-instrumentalist Akimbo Music Prod/Hungry Hill Records ------------------------------------------------------- Sincerely, C. Randy Bohrer Underwater Applications Corp voicemail/fax: (707) 222-7528 randy@mi*.co* www.mixedgas.com -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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