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There is a lot of discussion lately regarding reflux cooling automation using motorized valves to control cooling water flow rates. Now I freely admit that there are many here with far more expertise than me in this field so please put me right if I'm wrong in this.
It seems to me however that it would be simpler, elegant, cheaper and more accurate to control the flow by controlling a mag drive pump on the input and providing a cheap needle valve in the RC output to provide the pump something to push against.
Like I say maybe I'm missing something obvious and I'll be very happy to be told so.