Quick Disconnect Roundup

Test Loop

Turning pressure drop data into relative information for everyone is difficult to do. I have a feeling my previous attempts still just didn’t make the connection for everyone, so here is what I decided to do… standard test loop. I have a Swiftech GTZ, EK 9600GT Full Cover block and an MCR320 making up the test loop. While this loop doesn’t necessarily replicate your loop, it does represent an average to low-ish restriction loop and hopefully gives all of you something more concrete to relate the data to.

Also, that EK 9600 GT has been finally put on the card. If anyone has an older unused full cover block I can use for a test loop config and notice I said older and unused, shoot me an email please… info@skinneelabs

So, I looped these components up, with quick disconnects after the pump and radiator. Meaning, the CPU, GPU and Radiator could come right out after disconnecting. For your own loop and where to put the QDC’s, do what provides you the most convenience. As for the chart and resultant data, I tried to separate each Quick Disconnect into a separate color and the individual pumps with tops with a different shade.

Looking at the resulting flow rates, and seeing the maximum reduction in flow rate was only .3 GPM with the VL3’s I think I just became a fan of Quick Disconnects. Another surprise is the Colder HFC12’s edged out the Koolance VL3N’s, and no surprise the VL4’s introduce very little restriction to your loop.


Loss or Spill

This is what happens when you separate the male and female parts –quick disconnect– and the water trapped between the shutoff valves is left potentially dumping water on your components. Regardless of the fact some quick disconnects are no-spill, always use a cloth or paper towel to catch any fluid caught between the shutoff valves. Better to be safe than fry a component.

Vapor and I talked about how the heck to show the loss, his idea was hydrophobic paper which was brilliant… how about disconnect them over a plate instead, just photograph the result. I don’t have a way of measuring the loss/spill down the the mL, so a photo is the best we’ve got. As with all the thumbnails, click for a higher res image.

Colder HFC12

Colder’s shutoff valve doesn’t have any extra gaps for fluid to sit, so all of the loss will be in the female coupling… just remember to use something to prevent water from hitting your components, there is not a lot but the HFC12’s loss is enough to ruin your day.



Koolance VL3

The VL3’s use a X or cross extruded plunger on their shutoff valves, unfortunately this leaves some room for water to get trapped and spill when you disconnect. A little bit of loss, but nothing a paper towel can’t take care of.


Koolance VL3N

Okay, put up or shut up time on the No Spill claim of the VL3N’s… holy crap, there really is no spill. There is an extremely small amount of loss left over in the female coupling, but not enough for even a collective drop. I’m really surprised there is absolutely no spill, that’s quite a design accomplishment.


Koolance VL4

If you recall the photos of the VL4’s you’ll note the extra hollow cylinder on the shutoff valves, and my guess is that has something to do with the Extreme Flow title. Unfortunately, that also means there is some loss and the VL4 has the most loss and potential spill of the round up. Be sure to use a cloth or paper towel when disconnecting the couplings, there is more than enough fluid to dump on your components.


I am still amazed the Koolance VL3N’s had no spill, I was truly expecting a drop or two but there is not even enough for a drop left on the couplings… they earn the no-spill claim in my book.

On to the market pricing and conclusion, that is all of the data and photos I have for the round up.

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