Flow cascade control and flow level control
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As shown in the figure, there are corresponding differences between direct connection of the control valve to the level control, and cascade control using both the control valve and the flow/level control. What is the difference in control? Does direct control of the liquid level result in the valve being opened and closed frequently, causing unstable liquid levels?
In the case of a simple level control system, when flow rate acts as the disturbance signal, changes in flow rate affect the level, and only then does the control system start to adjust the level. By using a level and flow ship along with a control system, when the flow rate changes, the flow control circuit begins to adjust, thereby reducing the impact of the flow rate on the liquid level and improving the quality of level control.
I’m not quite sure; there’s basically no interference in terms of signal flow here (the pump outlet flow), and the purpose of regulation is to maintain a stable liquid level in the tank/tower.