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Air lines disconnect

AmericanMechanic

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Joined
Dec 30, 2014
Messages
404
Hello, when I have 2 air hoses connected and pull across the driveway, the female quick connect catches on a small divot in the concrete and disconnects. The quick connect however does not seem overly weak. Is this behavior normal?
 
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kylek350

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Sep 6, 2011
Messages
18
Location
Chicago, IL
That seems odd. I can see how one could disconnect if it really snagged on something, but that shouldn’t normally happen. When it comes to 1/4” air fittings, I’m totally sold on Milton High-Flows.


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S

Stedlin

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couplers-1024.jpg

The type on the left can snag and release easily. The one on the right will not.
 

rlitman

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Oct 18, 2010
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Location
Long Island
couplers-1024.jpg

The type on the left can snag and release easily. The one on the right will not.

Yes. That ring at the end prevents snags. Also, on the couplers without the ring, some are just more sensitive and open more easily than others.

Right now, I prefer the push-button connectors. They won't snag, but it only takes a light tap to pop the button. However, the push-button connectors will not shoot the end of the hose out, as they require a second press to release the male connector, and that second press seems to require pushing the button in further.
 

WaterBoyz

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Nov 16, 2015
Messages
368
Location
Northern VA
There are MANY types of air connectors.

https://www.miltonindustries.com/couplers-and-plugs.html?limit=36

All of mine are brass. No corrosion issues. I have no leaks when the metal is the same.

Now that my 4-post is coming I need to upgrade my air system so new connectors are in my future.

I believe there was a thread here that really got into the weeds as related to connectors and types and size and airflow.
 
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Stedlin

Guest
There are MANY types of air connectors.

https://www.miltonindustries.com/couplers-and-plugs.html?limit=36

All of mine are brass. No corrosion issues. I have no leaks when the metal is the same.

Now that my 4-post is coming I need to upgrade my air system so new connectors are in my future.

I believe there was a thread here that really got into the weeds as related to connectors and types and size and airflow.

The number one cause of coupler leaks is improperly loaded seals.
Several types of Milton couplers use the brute force approach to preventing leaks. This has the unfortunate side effect of making them very hard to engage. A prime example of this is the Milton AMT style coupler. I am unable to engage the plug without putting much of my body weight on it at typical air pressures.

In addition, brass is a poor choice for coupling air tools as it is soft and heavy and easily damaged by the hardened steel balls when used with tools such as impacts and air hammers. The brass part of the coupler that constrains the balls becomes enlarged and elongated with this type of use which eventually leads to leaking.
 
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Sticky Grips

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Aug 13, 2014
Messages
92
You need a coupling that has a drag guard on it. It prevents the sleeve from being pulled back.
 

PT Doc

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Nov 12, 2010
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3,197
Prevost push button safety couplers would solve this problem.
 

WaterBoyz

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Nov 16, 2015
Messages
368
Location
Northern VA
.....In addition, brass is a poor choice for coupling air tools as it is soft and heavy and easily damaged by the hardened steel balls when used with tools such as impacts and air hammers. The brass part of the coupler that constrains the balls becomes enlarged and elongated with this type of use which eventually leads to leaking.

I understand the steel and brass issue.

My stuff is not used daily or, sometimes, not even weekly. In my situation, I think I will be OK. But thanks for the lesson.
 

poppakap

Well-known member
Joined
Jan 3, 2010
Messages
226
The number one cause of coupler leaks is improperly loaded seals.
Several types of Milton couplers use the brute force approach to preventing leaks. This has the unfortunate side effect of making them very hard to engage. A prime example of this is the Milton AMT style coupler. I am unable to engage the plug without putting much of my body weight on it at typical air pressures.

In addition, brass is a poor choice for coupling air tools as it is soft and heavy and easily damaged by the hardened steel balls when used with tools such as impacts and air hammers. The brass part of the coupler that constrains the balls becomes enlarged and elongated with this type of use which eventually leads to leaking.

Cool product. Do you only have 1/4”?
 

archy99

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Joined
Jan 14, 2015
Messages
40
Location
Everett, WA
Worked at a place that made large aluminum tubes with windows, and most of the gajillion feet of hose used there had small rings of built up tape (usually a thin, and dense foam tape) at the female fitting on every hose length. Served three purposes...keeping the hoses from popping off when dragged, kept the hose fitting from getting severely abraded/eroded over time, and protected the aluminum structure if dragged around inside. There was scale at play here, obviously, as it was a normal day to spoil up over a thousand feet of air hose at shift end, but the same stuff applies in a small garage. Also worth noting that hose storage reels always were started with a male hose end going into a fixed female fitting on the spool, so the hoses were less likely to pop open, or snag.


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Stedlin

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I understand the steel and brass issue.

My stuff is not used daily or, sometimes, not even weekly. In my situation, I think I will be OK. But thanks for the lesson.
I understand and thanks for reading.
 
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