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This question relates to the position of the low tapping point of a liquid level bridle controlling level in a vessel filled with either water or condensate. Unfortunately, although it is not standard practice, the only option we have been left with is to connect the lower bridle tapping to the...

Thanks for all your responses. They were very informative and have given me an idea of the best way of controlling a reflux system. I agree that the system (albeit an inefficient one) can be controlled even though both curves are flat - the control valve will react to flow (not discharge...

TD2K, Yes I agree that a system can be controlled if you have a flat pump curve. But what about if both the system and pump curves are flat? Note: when i refer to system curve, this neglects the pressure drop across the control valve. Regards Mike

I am sizing a control valve for a reflux system that has been poorly designed. The valve controls temperature in the column (cascaded to flow) by throttling flow downstream of a centrifugal pump. Unfortunately, an inappropriate pump has been bought for this application and it will be operating...