How do I know that I have or don't have a non-relieving air coupler?

by Len
(Boston, MA)

My manual states that I should not use a non-relieving air coupler on my nailer. I bought a set of 5 couplers and fittings for my snap-on nailer. How do I know that the coupling is the correct one for my devise? Thanks.


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Len, I think a non-relieving coupler is a "checked coupler". A checked coupler is one that, when the mating connector is removed, holds an air charge behind it.

If you have an air charge in the nailer, even if the air hose is gone, then you have an air charge in the gun, and it could be fired unsafely.

The way around this issue, of course, is to only have a connector in the handle of the air nailer, and it's the air line that has the "non relieving" or checked coupler.

Then, when you unplug the coupler from the gun, any air in the gun will bleed out to atmosphere, while the air line will not bleed air because of the checked coupler on the end of it.

Short answer, only thread air connectors into the supply port of your air tools, never use a coupler, as most are non-relieving.

Cheers,

Bill



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Mar 12, 2015
Non-relieving air coupler
by: Bill

The vast majority of couplers are non-relieving, Ezra.

If you have a relieving coupler it will have a push button or slide on the side that allows you to move that device to vent air from the object that the coupler is attached to.

Short answer, only thread air connectors into the supply port of your air tools, never use a coupler, as most are non-relieving.

Bill

Mar 12, 2015
non-relieving air coupler
by: Ezra

How do I know that I have or don't have a non-relieving air coupler?

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air coupler not connecting

by Fred
(Las Cruces NM, USA )

I bought a 1/4 inch (F)NPT, and when I went to connect my hose the fitting on the house would not mate all the way.

I heard that there is a long and a short size for the male coupler. How can i tell which one i have?

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Hello Fred.

Not only are there long and short connectors, but they also come in different sizes and shapes.

You aren't alone in trying to figure out the differences, believe me.

If you take a moment to read the Couplers and the Connectors pages on this site, all will be explained.

Essentially, not all couplers and connectors mate correctly!

Cheers,

Bill

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Jan 04, 2010
Couplers & fittings
by: Fred

thank you for your help Bill.
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You are most welcome.

B.

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1/4" NPT Male To Schrader Thread Female Reducer Bushing

by Jose Bencosme
(Dominican Republic)

I am looking for this specific reducer bushing (or something similar) so that I can fit a Schrader valve stem (male) into a 1/4" NPT port (female).

Does such a thing exist, or are there any other ways I can achieve this purpose?

I will be very grateful for any information about this.

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Jose, greetings.

Is it your thought that the Schrader fitting is other than NPT? I would be surprised if that was the case.

Why don't you have a look at the site with the URL here:

www.fairviewfittings.com

I suspect they will have what you are looking for.

Cheers,

Bill



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I would like to know how to calculat a minor diamater at top and bottom of a 1/4" NPT thread?

by Jeff Jones
(Birmingham, Ohio)

We Have a fitting that we make that we were unable to use a tap on so we had to turn threads but we could not figure out a minor diameter to turn I.D. to.
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Jeff, interesting question.

In any case, since NPT threads are a standard, it were me with this issue, I would get a 1/4 NPT male fitting and measure it.

Cheers,

Bill

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