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Knife_man wrote: ↑Wed Aug 17, 2022 6:01 am bcook608 wrote:
You want the control at the output.
Is there a reason for that?

Not necessary unless one is operating a flute (plated column).. adding a valve on the output side just put addition pressure on the water line and connection for no addition purpose in controlling water flow..

Mars

Knife_man wrote: ↑Wed Aug 17, 2022 5:59 am

bcook608 wrote: ↑Wed Aug 17, 2022 2:08 am You want the control at the output.

Is there a reason for that?

I've always had it on the input with the reasoning that the pressure will be reduced through my dodgy soldering , and flow rate will be the same either way.

The argument for having the control at the output is that you have higher flow into your condenser which ensures that it remains full. Imagine a dephlag where you feed in from the top (contra-flow cooling). If you throttle the input then you'll drain faster than you fill (unless you take your output tube above the height of the dephlag. There are people here who argue that it helps eliminate bubbles from the condenser.

The argument for controlling the input is this.

NormandieStill wrote: ↑Wed Aug 17, 2022 10:01 am If you throttle the input then you'll drain faster than you fill (unless you take your output tube above the height of the dephlag.

That line of thinking does apply somewhat to dephlegmator operation, but not necessary to other style of reflux condenser.. further more, water line should always to feel from a higher height than whatever RC being used, as it reduces pressure on the connections at the RC, plus creates a slight pressure on the water flow..

Mars

NormandieStill wrote: ↑Wed Aug 17, 2022 10:01 am

Knife_man wrote: ↑Wed Aug 17, 2022 5:59 am

bcook608 wrote: ↑Wed Aug 17, 2022 2:08 am You want the control at the output.

Is there a reason for that?

I've always had it on the input with the reasoning that the pressure will be reduced through my dodgy soldering , and flow rate will be the same either way.

The argument for having the control at the output is that you have higher flow into your condenser which ensures that it remains full. Imagine a dephlag where you feed in from the top (contra-flow cooling). If you throttle the input then you'll drain faster than you fill (unless you take your output tube above the height of the dephlag. There are people here who argue that it helps eliminate bubbles from the condenser.

The argument for controlling the input is this.

... A picture is worth 1000 words: In my case with CM setup I do like the idea of throttling the input to the Condenser over the output just to cut down on water pressure at more connections. Having said that, it is important to elevate the output line to the top of/above the RC to ensure a full water jacket although I don't think it's really made a material difference for me. What has made a difference in my ability to reflux is to ensure the RC water supply pressure and flow is constant. In my case, it means that it must be completely independent from my PC water supply.

Eric wrote: ↑Sun Mar 06, 2022 2:53 am C0188B86-5ECA-4AC1-9176-C42D5D1D0F4E.jpeg
I just use harbor freight pneumatic lines and needle valves

Really digging that Turtle.....

i have 2 separate lines one condenser and one for reflux sorry so long trying to go legal atm