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QDC Flow Direction


Outsider
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Which way is best for QDC's. Water flowing from a male to a female or the other way around, or does it even matter?

 

I'm interested before I switch from QDC3's to QDC4's. With 6 D5's at 25% I get 0.5GPM, running them at max is only 1.2GPM and dumps way to much heat to be worth it. I'm hoping for a drastic increase upgrading to QDC4's but not expecting much since I'm running 90's off every pump inlet/outlet which that alone is my main issue.

Edited by Outsider

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  • Outsider changed the title to QDC Flow Direction
EHW Review Manager

I don't believe orientation matters. I did read a statistical article recently about the flow perf of QDC3 and QDC4, though I can't recall the actual source. The flow improvement from 3-4 is 2x lower at 3.5GPM. If I didn't already have $750 worth of QDC3's I would be all over the 4's.

 

Found it. It's an old article though

 

WWW.XTREMERIGS.NET

Page 1Page 2Page 3Page 4Page 56. View All Quick Disconnects (QDCs) are nifty little connectors that let you quickly remove an item from your loop without having to drain the loop. This is very useful for example...

qdc.png.c562e4064d5cedac14c08cce7bd33bbe.png

 

Edited by Avacado
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...according to Koolance, it doesn't matter. The directional arrows below are just for the spring-loaded locking rings

 

KoolancdQD4a.thumb.jpg.b4ac7ff5eae5cc24f6d851b8dfd9c568.jpg 

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Edited by Sgt_Swanny

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8 hours ago, Sgt_Swanny said:

It a great piece of kit, I swear by aquacomputer

 

I ordered a Leakshild from them back in September and got it last month. I spoke to Aquacompter about their stock issues and they said it was down to a acquiring components. 

 

I manage to the MPS 400 a few weeks ago from aquatuninguk (based in Germany) I think they have a few left in stock. 

Possibly replied to the wrong thread ?

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On 05/02/2022 at 14:09, J7SC_Orion said:

...according to Koolance, it doesn't matter. The directional arrows below are just for the spring-loaded locking rings 

Coming from a mobile hydraulics background, any QD's that aren't bi-directional would be utterly useless. We use larger versions of these all over agricultural and industrial equipment 🙂.

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Yep shouldn't matter at all.

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Ok thanks. That's good to know

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Tangential, but I thought it might be mildly interesting.  Here are a pair of mobile hydraulic QD's.

KIMG1373.thumb.JPG.7f5d1bec3c5fd0c3d3f3b2cadde89af4.JPG

 

These would be okay for circuits up to about 10gpm.  Their rated working pressure is 4350psi with a burst pressure of 7000psi (female) and 17,000psi (male).  The pressure drop across the union at 13.25gpm would be about 150psi.  Most circuits (loops) would be using 2 pairs of these, so that 150psi pressure drop x 2 would equate to a about 1762W (about 2.25hp) of power being wasted (mostly as heat either radiated away by the couplers themselves or transferred by the oil to an oil cooler).

 

 

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