How to control the flow rate in the chemical dosing pipeline? How should it be modified as shown in the diagram?
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The pictures taken by the customer on site show this situation; they want to measure and control the dosage of the chemical
If there are no flow meters or control valves in the image you provided, then a flow meter needs to be installed to monitor the flow rate, and a control valve needs to be installed to regulate the dosage of the chemical added. The specific modification plan needs to be designed based on the actual conditions on site and the pipe dimensions. .
It seems to me that your pipeline is of DN50 size; simply adding more pipes likely won’t be sufficient, as it will be necessary to extend them downward in order to increase the flow rate and enable proper control of the system :)
It’s better to choose a metering pump; other methods are difficult to control due to factors such as liquid level and adjustment errors. After selecting the metering pump, fine-tuning can be done using the backflow volume. For reference.
An electric (pneumatic) valve can be equipped with a flow switch to achieve this.
A metering pump should be installed beside it; a correction column can be added at the inlet, or a float flow meter can be installed at the outlet. If valve control is used, the flow rate can only be limited by the existing upper limit; by adding a metering pump, it is possible to adjust the flow rate according to needs – simply turn the control knob to the desired level. Some people suggest using backflow for this purpose, but this is a wrong advice, as it is difficult for positive displacement pumps to regulate flow rate through backflow. ）