Which adapter CGA-580 to NPT?

admin

Hi all,This is my first post here since I’m not American and we have our Ukrainian welding forums. The problem that made me to inquire your advise was that the standards of Argon regulators’ connections are different throughout the World and our Ukrainian argon-filling stations do NOT deal with tapered connectors like CGA-580 (they deal only with threaded flat faced connectors), which is common in the US, while I’ve bought a US Smith flowmeter, which has a CGA-580 connection. So, I have this flowmeter and a ¾” NPT threaded valve that should be coupled with each another. I’m looking for the proper adapter from CGA-580 to ¾” NPT. I’ve seen Western connectors and I am a bit confused with the connector I need. This is because Western have two main groups of adapters for CGA-580 standard. One group comprises adapters with part numbers 15-3 through 15-11 (this group is named as “CGA-580 FOR ARGON, HELIUM & NITROGEN” at the Western web-site), and another one comprises adapters with part numbers B-70 through B-72 (this group is named as “MALE NPT OUTLET ADAPTORS FOR MANIFOLD PIPELINE”). Both groups comprise adapters from CGA-580 to NPT, so what is the difference between them? And please suggest which connector should I buy that will fit my needs?Also, there are no spares for the second group. And the first group has some spares - 615-O (O-Ring Replacement) and 615-PT (Soft Tip Replacement). Could anyone clarify what the 615-PT (Soft Tip, Replacement) is used for? Is this spare similar to that which is installed inside of the CGA-580 male connector of my flowmeter (it looks like a cylinder piece of foam aluminum)?Thank you in advance for your advices.Sincerely yours,Alex
Reply:i doubt the valve is npt. see if this is what you need---http://weldwarehouse.com/cgi-bin/einstein.pl?::1:WLDWH:1:312=806  . it adapts an argon gauge to a co2 valve which is flat faced.miller thunderbolt 250vlincoln square wave tig 175 prolincoln idealarc mig sp250everlast tig 210EXTeverlast power plasma 50chicago electric (hf) 130 tig/90 arcchicago electric 90 amp flux wire3 sets oxy/acet
Reply:you probably have a DIN/ISO valve, which I believe are the same.  Here is a link to superior Europehttp://catalog.superiorprod.com/view...477-connectors  It looks like a DIN6 for argon/ inertsExperience is something you get right after you need it
Reply:Thank you guys for the links.Actually I have valves with both threads – NPT and BSPT (British), and they fit each other very well up to 1” diameter. In my country BSPT is common.The first link, provided by boatbuoy, shows an adapter that actually consists of two fittings, and they both have inner threads. Would it be possible to unscrew them to get two separate fittings one of which has an OUTER NPT thread? This is because the valve I have has an INNER thread and also because CGA-320 differs from NPT (if I understand correctly).The second link, provided by Fred s, shows a DIN-6 fitting, which is supposed to be installed instead of the current one that is a part of my regulator, right? The first obstacle on that way is that the regulator’s body doesn’t have a flat surface for vising to unscrew the currently installed fitting, and the second is that this fitting has a W 21.80 x 1/14 RH thread. Of course, in Ukraine this type of thread is widely used for argon applications, but it is used in distributing systems, not in valves for small tanks, which do use BSPT. I would appreciate your further comments and advises. Thanks again,Alex