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Is KL Quick disconnects more restrictive than a 90 elbow fitting?

post #1 of 14
Thread Starter 
Is KooLance Quick disconnects (eg. VL3N) more restrictive than a 90 elbow fitting?
When the two parts connect, is it hollow like a straight compression fitting?
Or maybe the restriction is between a 90 fitting and a straight fitting?
post #2 of 14
http://skinneelabs.com/quick-disconnect-roundup/
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post #3 of 14
Looking at that test that Skinnee did (linked above) and Martin's testing on fittings, the Quick Disconnects (QDCs) are quite a bit more restrictive than even 90° elbows:

Skinnee's QDC testing


Martin's fitting testing




Yes, I know I have just compared two different tests, which is not usually valid, but an almost 10x difference can't be put down to test procedure.

I wouldn't worry about using them though, so long as you are not planning on using a bunch of them they will not make a huge difference to loop performance.

Edited by GingerJohn - 4/25/11 at 10:07pm
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post #4 of 14
just get a pump w/ high head pressure and don't go all crazy and replace all your fittings w/ qdc if you're so worried about restriction. I use one as a drain line on a piece of tube attached to an additional port on my res. Works good enough for me
post #5 of 14
Wouldn't one set the resistance and any other one added just keeps the resistance. As in it doesn't just keep adding up until there's no flow.
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post #6 of 14
One or two aren't going to hurt your loop, however avoid them wherever possible. For example, two 45-degree fittings make a 90-degree and do not restrict flow. I use two quick disconnects, they are not very restrictive as long as you go with VL3N's (VL3's were a crap revision, as you can see in the graph above). Very handy for draining the loop with a second male fitting and some spare tubing.
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post #7 of 14
I ordered one male/female VL4N for draining. I was going to use more for actual disconnecting, but the cost kills it.
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post #8 of 14
Quote:
Originally Posted by Rangerscott View Post
I ordered one male/female VL4N for draining. I was going to use more for actual disconnecting, but the cost kills it.
But if you disconnect the male and the female in the loop, how are you going to get the water to come out? You'll need a spare male to connect to the female or else the water won't flow.
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post #9 of 14
Quote:
Originally Posted by Rangerscott View Post
Wouldn't one set the resistance and any other one added just keeps the resistance. As in it doesn't just keep adding up until there's no flow.
No. If you are putting them in series the restriction adds up. There will never be no flow, but there will eventually come a point where there is very little flow. You would have to have quite a lot of things in the loop for this if you had a decent pump though.

Quote:
Originally Posted by jNSK View Post
For example, two 45-degree fittings make a 90-degree and do not restrict flow.
Interestingly, Martin's results show that two 45° fittings would have the same restriction as one 90° fitting. But neither have all that much, so they are fine to use, in moderation.

Quote:
Originally Posted by jNSK View Post
But if you disconnect the male and the female in the loop, how are you going to get the water to come out? You'll need a spare male to connect to the female or else the water won't flow.
You can always do something like this:



That way you have the handy QDC for draining and you are not running it in your loop, so less restriction. On the down side, it takes more space and can look messy. You can also get a threaded female QDC and screw it straight into the T-piece.

Edited by GingerJohn - 4/26/11 at 10:26am
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post #10 of 14
That's a good idea
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