Does this fitting exist?

[Teter09]

Hey Everyone, I have spent most of the last 2 days searching online and in stores for a fitting that I can't seem to find. I'm not sure what to call it or if it exists...hopefully someone here can help me.

The Check valve on my IR compressor is connected to the pump by hard copper pipe. 5/8 outer diameter, 1/2 inch inner. The ends of the pipe are flared (see images below, but the threads of the nut aren't typical I guess. The nut has a diameter of 7/8 and the threads are 18 per inch. Someone on here suggested they were reverse flare, which I believe to be correct, but I can't find an adapter with a male fitting for reverse flare, only female adapters with a male NPT fitting on the other side. I've tried explaining this to 2 plumbing supply places and I'm told that my measurements must be wrong because flare fittings at 5/8 don't have 18 threads per inch....and there wasn't any real help after that.

I need to connect my 3/4 NPT hose to the check valve...so what are my options? Would the local Grainger potentially have this (they closed before I had a chance to go Friday and are closed on the weekend)? Also, what do I call what I'm looking for? Thank you for any insight!

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[rlitman]

Better question: why would you connect a hose to your check valve? If you're going between the pump and the tank, consider that this takes a LOT of heat.

 

[Teter09]

Better question: why would you connect a hose to your check valve? If you're going between the pump and the tank, consider that this takes a LOT of heat.

Correct, but it won't have much heat left after flowing through my aftercooler, which is why I'm looking to change the connection.

It's a compression fitting you need a compression to npt adapter

Home Depot or Lowes might have Something that big but I am not positive

Compression huh? The specs say its 13/16-18..which is slightly smaller than the 7/8 of the current nut. Is that to be expected/ok? Wait, where you thinking I was trying to connect the copper to the check valve? I'm not....I'm trying to find an adapter to connect an NPT fitting to the the reverse flare on the check valve.

 

[theoldwizard1]

It's a compression fitting you need a compression to npt adapter

No, it is NOT compression, it is flared !

Mcmasters lists 2 different flare angles 37° and 45°.


For a tube that is 1/2" OD, the flare nut is 16 TPI. The 3/8" OD tube nut is 18 TPI.

 

[Teter09]

But mine is 5/8 OD, and the threads are 7/8-18...

 

[FullRaceMerc]

It is an inverted flare. Male threads on the tubing side.
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This is a normal flare. Female threads on the tubing side.

This is a compression fitting. See the brass ferrule that compresses when tightened?

 

[FullRaceMerc]

I'm not following exactly what you're trying to connect. Does the new hose replace the tubing pictured or connect to it?

These guys show an adapter to connect 5/8 od inverted flare tube to 1/2 NPT. You could use a bushing or bell to go from 1/2 NPT to 3/4 NPT, if connecting to the tube is what you are trying to do.

 

[Teter09]

I'm not following exactly what you're trying to connect. Does the new hose replace the tubing pictured or connect to it?

These guys show an adapter to connect 5/8 od inverted flare tube to 1/2 NPT. You could use a bushing or bell to go from 1/2 NPT to 3/4 NPT, if connecting to the tube is what you are trying to do.

Yes, the new hose will replace the copper pipe. So I need a male inverted flare connection to screw in to the check valve.

The adapter you linked to is what I have found also, but is the female side.

The check valve was connected to the copper pipe by the steel nut which is shown in the picture. I'm trying to find an adapter that eliminates the copper pipe and replaces the nut side of thr connection. So the new fitting would screw in to the check valve and converts to any other connection I can adapt to npt.

 

[OccupantRJ]

One option is to find a fitting you like, then cut the copper tube off and silver solder it to the fitting that will receive the hose. A fitting can be drilled to slip over the copper tube to make a very good socket type attachment. Your converted fitting will then screw into the check valve, and your hose into this created adapter. I have often had to make unusual conversions in this manner. Your copper line fitting is a 5/8" inverted flare, which has 7/8"-18 threads.

 

[Rookie2]

probably have to make an adapter or install a male pipe threaded check valve in the tank.

https://www.bing.com/images/search?q=brass+inverted+flare+pipe+fittings&FORM=HDRSC2

 

[theoldwizard1]

It is an inverted flare. Male threads on the tubing side.

I missed that !

McMaster still has them

 

[FullRaceMerc]

[whisper]There is a first time for everything. I won't tell anyone. [/whisper]

It sounds like you might have to change the check valve get to threads that you can work with if you can't find an adapter of the right configuration. This video shows a guy changing the check valve & using a hose with NPT on one side & a normal flare on the other instead of a fixed tube: http://www.mastertoolrepair.com/transfer-tubes-nylon-tubing-steel-braided-transfer-tubes-c-25_294_434.html. That site shows hoses & check valves that might help.

 

[theoldwizard1]

[whisper] This video shows a guy changing the check valve & using a hose with NPT on one side & a normal flare on the other instead of a fixed tube: http://www.mastertoolrepair.com/transfer-tubes-nylon-tubing-steel-braided-transfer-tubes-c-25_294_434.html. That site shows hoses & check valves that might help.

Funny you should link to this ! 2 weeks ago I replaced a couple of 1/8" (?) plastic (nylon?) hoses on a portable compressor with 3/8" SS hose with compression ends. I need a couple of 1/4" NPT to compression adapters. A couple of 90s, a couple of straight and one close ****** to space the elbow away from the on/off switch.

 

[billyjp2]

Eaton weatherhead part # 202x10. I'm sure they have a distributor local to you. Alot of their stuff is American made as well.

 

[AnEv942]

Possibly add a bulkhead fitting above, shorten/reroute existing line from pump to tank. Leave the tank plumbing/valve as is. Run cooler line to bulkhead fitting. Also give you direct access back to pump should issue arise with cooler.