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I was looking at the modification for sale on controlling the cooling water rate without affecting the condenser, and I thought I'd give it a try myself. Basically, it involves an adjustable valve and two t-joints. The water comes directly from the pump, and is split two ways; one goes to a valve, which leads to the cooling tubes at the top of the column. The other goes directly to another t-joint where it joins up with the water leaving the column tubes and goes into the condenser. The idea was to split the water 50/50 between the column and the condenser, allowing the valve to be closed slowly skewing the ratio in favor of the condenser, but it doesn't seem to be working as planned. The water to the column seems to be flowing very weakly. What have I done wrong, and how is it done in the modification? Is it possible that simply turning the first t-joint 90 degrees will split the water more evenly? 
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Rank: Guest
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Seems to work much better now  Turned the initial t-joint 90 degrees and elevated the pump. Much better water flow, but is the amount of water going to the column going to be sufficient? Here's a diagram of how it works: 
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Rank: Guest
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Incidentally, by 'elevated the pump' I meant to say that I elevated the entire coolant reservoir to the level of the still head.
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Rank: Guest
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I have a feeling you might be over thinking things. As long as you have a full strong flow to you cooling sleeve and ANY sort of flow regulation to the column you should be fine. Even the slightest dribbling flow to the column will help in regulating the temperature. Check your thermometer and tweak the valve accordingly.
I use pretty much the same idea, only I don"t have the 2 flows merge before they rejoin the basin. I have 2 separate hoses leading in, that way I can visually monitor the amount of flow I"m getting through the column.
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