Which Colder (CNC) Disconnect Model?

[hotdun]

I need to get some quick disconnects for a radbox build. I've narrowed it down to 2 models from Colder as potentially being the best and least flow restrictive. Which one is a better choice do you think?

1. HFC12
Main Components: Polypropylene
Coupling Size: 3/8"
Pressure: Vacuum to 60 psi, 4.2 bar
Temperature: 32° to 160°F /0° to 71°C
Materials: Polypropylene
Thumb latch: Polypropylene
Valve spring: 316 stainless steel
Panel mount gasket: EPDM
External springs: 316 stainless steel
O-rings: EPDM
Color: Light gray with charcoal gray latch
Tubing Range: 3/8" to 3/4"


2. NS6
Main Components: Glass-filled polypropylene
Coupling Size: 3/8"
Pressure: Vacuum to 120 psi, 8.3 bar
Temperature: 32° to 160°F /0° to 71°C
Materials:Glass-filled, polypropylene
Thumb latch: Glass-filled, polypropylene
Valve spring:(wetted) : 316 stainless steel
Panel Mount Gasket: EPDM, FKM
External springs: 316 stainless steel
O-rings: EPDM or FKM
Hastelloy C External spring: 316 Stainless Steel
Soft touch overmold: TPV (thermoplastic vulcanizate)
Color: Gray with dark gray overmold standard (gray with red or blue overmold available)
Lubricants: Krytox PFPE (inert)
Spillage: ~0.03 cc/disconnect @ 0psi, ~0.30 cc/disconnect @ 120psi
Tubing Range: 3/8" and 1/2" (9.5mm to 12.7mm)




Does "glass filled" matter at all?
Does barb size matter when the couplings are the same size diameter?
Is Cv an accurate measurement with our lower flow rates?
Are 2 of these too much restriction for 1 loop!

[brammers]

See here:

http://www.xtremesystems.org/forums/...9&postcount=32

Using them on my radbox, no flow issues here!

HTH
J

[Lloyd]

I have a couple of the NS6 series - they're huge. So big they didn't fit the application i intended

[hotdun]

Thanks for the feedback guys. I'm leaning towards the NS6 because of the Cv values in the screenshot above. It looks like the higher the Cv value, the better the flow. Both of these fittings are priced similarly. Anyone else using these babies?

So I guess a question would be, does the stated Cv value really come into play with the low flow rates we have?

[iandh]

Glass filled plastics are somewhat similar to fiberglass composites, except with a plastic resin instead of a polyester or epoxy based one.

They are much more mechanically stable, but are also more brittle than standard plastics. Kind of a tossup.

[hotdun]

...They are much more mechanically stable, but are also more brittle than standard plastics. Kind of a tossup.

What do you mean by mechanically stable? Sturdier? BTW, I just ordered 2 of your MCR320 Rad grills for this radbox build. They are brilliant....

[Nickel020]

I have the NS6 for 1/2" here, and they're great, but hey're very big as well. They don't drip when you open them.

I also have the much smaller APC series which is also popular, but it only goes up to 3/8" and it does drip a little bit when opening (just hold a towel below it when opening, it's not really a big problem).

Both are very high-flow, from a pure flow standpoint you don't really need to go with the NS6.

[SimpleTECH]

Wow, those are pretty cool barbs. Never thought of quick disconnects before.


*Off Topic: hotdun if my mom ever saw your avatar.. I probably wouldn't be able to use my computer all night.

She's a big Tom Selleck fan.

[iandh]

What do you mean by mechanically stable? Sturdier? BTW, I just ordered 2 of your MCR320 Rad grills for this radbox build. They are brilliant....

Some unfilled plastics can deform over time, especially when under pressure from things like hose clamps. Some plastics such as acetal (delrin) are very stable by themselves, while others such as polyethylene are not. Polypropylene is kinda in the middle.

[hotdun]

*Off Topic: hotdun if my mom ever saw your avatar..

Your Mom is a smart lady. Magnum PI was the best show on TV ever, hands down. I heard Matthew Mcconaughey's playing in him in the Magnum movie....

Some unfilled plastics can deform over time...

Thanks again iandh, I gotcha now. I'll probably use these for as long as I water cool so....

Can anyone concur on the Cv values and their relationship to flow, especially when it comes to out lower flowing systems? Martin.......anyone......Bueller?

[hotdun]

....I can tell you that I saw absolutley no temp increase...

Sweet, thanks man. With a block like the EK, I suppose you would see temp increase fast with more restriction in the loop. I found this on the Cv value btw:
============================
The flow coefficient - Cv - lets us compare flow capacities of valves at different sizes, types and manufacturers.

The flow coefficient is in general determined experimentally and express the flow capacity in imperial units - GPM (US gallons per minute) of water that a valve will pass for a pressure drop of 1 lb/in2 (psi).

The flow factor - Kv - is also in common use, but express the capacity in SI-units.

The flow coefficient - Cv - required for a specific application can be estimated by using specific formulas for the different fluids or gases. With the estimated Cv value - the correct valve can be selected from the manufacturers catalogues.

Flow Coefficient - Cv - for Liquids
For liquids the flow coefficient - Cv - expresses the flow capacity in gallons per minute (GPM) of 60F water with a pressure drop of 1 psi (lb/in2).

Flow expressed by volume
Cv = q (SG / dp)1/2 (1)

where

q = water flow (US gallons per minute)
SG = specific gravity (1 for water)
dp = pressure drop (psi)
============================

Cv Calculator