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canuckdiver
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thanks fred, if you could forward that info about the threads to me, would be greatly appreciated!
1/2" tank valves?
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CGA 870 is .750-16 UNF. I just measured one to make sure.
Neil
Neil
IdahoScuba
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I just bought a brand new Sherwood yoke valve with 1/2 inch thread for one of my old tanks in November 2002.
Bob3
Contributor
Try some of this stuff for the CRS, works for me. :tease:
FredT
Guest
CGA-870 (medical post) valves are 1/2-14NGT or .750-16UNF-2A
CGA-540 (Industrial and bulk medical) valves are available in those sizes plus:
3/4-14 NGT
1-11.5 NGT
1.125-12 UNF-2A
FT
CGA-540 (Industrial and bulk medical) valves are available in those sizes plus:
3/4-14 NGT
1-11.5 NGT
1.125-12 UNF-2A
FT
pescador775
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I didn't have time to read ALL the posts, sorry.
Here's the answer (again?). Yes, Matilda, they used to make a 1/2" straight pipe thread O ring SCUBA valve, for about two years. Extremely rare and obsolete. However, any competent machinist can turn down a standard valve to 1/2" SPT or 3/4" NMT-O ring. Have someone verify the thread. Measure twice, sew once. Start with a new or good used valve which has the dip tube in or near the center of the boss. Some of these are offset and you don't want that. The neatest set up is the old OMS valve made in the nineties. This valve is extremely compact and will look good on your O2 tank. A machinist will probably charge about $50. However, I should mention that there is significant set up time so that first valve may cost more. You can save time/$ by disassembling the valve yourself.
Here's the answer (again?). Yes, Matilda, they used to make a 1/2" straight pipe thread O ring SCUBA valve, for about two years. Extremely rare and obsolete. However, any competent machinist can turn down a standard valve to 1/2" SPT or 3/4" NMT-O ring. Have someone verify the thread. Measure twice, sew once. Start with a new or good used valve which has the dip tube in or near the center of the boss. Some of these are offset and you don't want that. The neatest set up is the old OMS valve made in the nineties. This valve is extremely compact and will look good on your O2 tank. A machinist will probably charge about $50. However, I should mention that there is significant set up time so that first valve may cost more. You can save time/$ by disassembling the valve yourself.
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