1)I have heard that it should not operated the pump with the flow rate at a point where performance and sytem curve intersected (short circuit). Is it right? Then at that flow rate, the delta-P is zero, can we use it to find the maximum controllable flow of control valve? Do it have a rule of thumb for this estimation? My question is that how can we find that mentioned flow rate? If it have ,please suggest.2)You stated above about the range 10:1, do you mean the term of turndown and for rangeablity 20:1, do you mean the ratio of maximum controllable / minimum controllable flow? If I misunderstood your point, please give me some explanation.Many thanks in advance for your answer.>>1)I have heard that it should not operated the pump with the flow rate at a point where performance and sytem curve intersected (short circuit). Is it right? <

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