Control valve issues
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This post was last edited by bridge0601 on 2015-10-29 08:29. Why are some control valves placed in front of the cooler, while others are placed behind it? Could some expert please answer?
The control valve is placed in front of the cooler because the oil has a higher viscosity after cooling and is less likely to vaporize. A normal control valve should be placed behind the cooler, which can reduce the cost associated with the control valve.
Agreed. It should also be added that pressure changes can occur; for example, if reducing the pressure significantly leads to a decrease in the pressure energy of the heat exchanger, then it is considered appropriate to place it in front of the cooler.
Thank you for your reply. But some of our oils have high viscosity – why is the control valve also located in front of the cooler?
Which expert can explain it again? I don’t quite understand it
The hot medium is generally controlled on the pipeline entering the heat exchanger, while the cold medium is generally controlled on the pipeline exiting the heat exchanger.
One is to prevent overheating that could lead to overpressure, and the other is to prevent heat exchange from being affected by preheated gasification.