Sampling is done from ordinary centrifugal pumps; water is added to the pump using a water intake tank and pipes along with bottom valves. What is the difference between these two methods?
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A water intake tank at home cannot increase the suction lift of a centrifugal pump; then why not simply use a tank pump with a bottom valve?
The size of the water intake tank needs to be calculated; once it is properly set up, it is more durable and efficient than a bottom valve, providing a solution that lasts forever. For some temporary applications, it is also possible to use a bottom valve, but it is necessary to ensure its sealing performance; moreover, if the medium is dirty, it should be cleaned and maintained regularly.
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Experimental results show that using a bottom valve with the pump is less effective than using a siphon tank at the inlet; after the pump stops, leakage occurs through the bottom valve and the liquid flows back. In contrast, the inlet of the siphon tank is located at a higher position, and even if water flows back into the tube leading to the tank’s inlet, as long as there is still water inside the tank, it is easy to start the pump again without any issues with fluid flow
:The D water intake tank functions as a self-priming device, while your bottom valve is simply used to prevent backflow; this aspect needs to be considered from an economic perspective
Bottom valves tend to break easily, and the self-priming height after installing a bottom valve also depends on the pump’s own suction capacity. So it’s safer to add a vacuum drainage tank
It seems you are referring to a self-priming pump. In terms of cost, it’s definitely the bottom valve.