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Bypass loops and check valves

post #1 of 5
Thread Starter 
Normally, having a secondary path in a loop is a problem, In my case, I'm trying to cobble something together to cool a piece of equipment with a water hookup. Its not much, maybe 400 watts of heat load so a smallish setup might be able to do just fine, the problem is that the waterflow is selective on the equipment. If it doesn't need the water it energizes the solenoid and shuts off the flow... Needless to say, this could harm the loop if it was just a single series loop.... So I set about looking to make a small parrallel path regulated by a checkvalve which hopefully springs open when the pressure rapidly increases on account of the solenoid valve shutting off the normal path.

1st Question: Are their cheap "PC watercooling-esque" check valves out there, so far, my finding is that there is not.
2nd Question (assuming first is no): Is there a decent 1/2" NPT check valve that opens above 1 psi? (the assumption here is that most loops have a dynamic pressure of at least 2 or 3 through normal waterblocks and other restrictions...for instance, a D5 is rated at 50 psi. (Not that it would reach that much, but you see why I think 1 might just be a parasite thats open all the time, robbing all the flow and capacity)
post #2 of 5
Quote:
Originally Posted by Alea iacta est View Post

1st Question: Are their cheap "PC watercooling-esque" check valves out there, so far, my finding is that there is not.

2nd Question (assuming first is no): Is there a decent 1/2" NPT check valve that opens above 1 psi? (the assumption here is that most loops have a dynamic pressure of at least 2 or 3 through normal waterblocks and other restrictions...for instance, a D5 is rated at 50 psi. (Not that it would reach that much, but you see why I think 1 might just be a parasite thats open all the time, robbing all the flow and capacity)
Why do you need a "watercooling" valve? There are plenty of plastic or metal check valves available. As for the type there are three available:
Spring: downside is some back pressure.
Ball: Depending on the orientation and size (inside diameter) there may not be enough flow to move the ball.
Flapper: This is what you need. I've successfully used one - 3/4 inch, in such a system.
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CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
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My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
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post #3 of 5
Thread Starter 
Quote:
Originally Posted by billbartuska View Post

Why do you need a "watercooling" valve? There are plenty of plastic or metal check valves available. As for the type there are three available:
Spring: downside is some back pressure.
Ball: Depending on the orientation and size (inside diameter) there may not be enough flow to move the ball.
Flapper: This is what you need. I've successfully used one - 3/4 inch, in such a system.


Yeah, I am aware of some of whats out there that is part of the problem as this wold be considered "niche" compared to the needs of industry. especially in pneumatics and hydraulics...but I don't need something that opens at 150 psi or 3000 psi and costs $200/p....Hence the "watercooling". I am partial to it being brass, that would be preferred but not required. Like I said, I've got some at grainger that I picked up to put in the loop. Its just really hard to get a feel for the dynamic system pressure. As far as I can tell, I'm using 1/2" ID on everything in my setup AFAIK.
post #4 of 5
Thread Starter 
Quote:
Originally Posted by billbartuska View Post

Why do you need a "watercooling" valve? There are plenty of plastic or metal check valves available. As for the type there are three available:
Spring: downside is some back pressure.
Ball: Depending on the orientation and size (inside diameter) there may not be enough flow to move the ball.
Flapper: This is what you need. I've successfully used one - 3/4 inch, in such a system.


Yeah, I am aware of some of whats out there that is part of the problem as this wold be considered "niche" compared to the needs of industry. especially in pneumatics and hydraulics...but I don't need something that opens at 150 psi or 3000 psi and costs $200/p....Hence the "watercooling". I am partial to it being brass, that would be preferred but not required. Like I said, I've got some at grainger that I picked up to put in the loop. Its just really hard to get a feel for the dynamic system pressure. As far as I can tell, I'm using 1/2" ID on everything in my setup AFAIK.

Has anyone ever measured their system pressure and has some numbers on hand?
post #5 of 5
Pressures are low, 1-3 psi.
I had an Iwaki (MD20RZT) three blocks and two rads and it would do 3-1/2 PSI.
My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
  hide details  
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My System
(15 items)
 
  
CPUMotherboardGraphicsRAM
FX6300 Black M5A99X EVO R2.0 Nvidia GTS450 Team Vulcan PC3 12800 
Hard DriveOptical DriveCoolingOS
Samsung 840 PRO Asus DRW-1608P (x2) Custom Water Cooling Win7 (Ult), Win 8.1 & Win Server 2012 R2 
MonitorKeyboardPowerCase
2 X Samsung 915N Ducky Shine III, Blue Cherry/Blue LEDs PCP&C 1kw Lian Li PC-71 (W/Window) 
MouseAudio
Logiteck G400s none 
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