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Does the self priming pump need to install a foot valve, what happens if it is not installed?

Author: admin Source: the internet Posted On: 2020/8/26 10:27:22

Self priming pump is a kind of machinery used in many families now. Refers to an external-mixing centrifugal self priming pump. According to the rotation of the impeller, the liquid flows to the volute, so that the pump body forms a vacuum, so that the one-way valve of the self-priming pump will open to suck the liquid in from the inlet and pass through the impeller flow channel This is how it works.
One of the advantages of the self priming pump is that it does not need to be installed in the pool but installed on the pool, which avoids the submersible pump from being soaked in the pool all year round and it is easy to be rusted or the submersible pump motor is damaged due to the damage of the seal. .
   It is also possible to use explosion-proof motors that can transport flammable and explosive liquids, such as gasoline (the impeller uses a self priming pump with a copper impeller), alcohol and other liquids.
   There are also places without power supply that can be driven by diesel engines for farmland irrigation and emergency rescue.
   can also be installed on a mobile trailer or a large power pump truck for urban flood control and emergency rescue to extract urban water.
  The distinguishing feature of the self-priming pump is that it does not need to be filled with water when it is used. But you must remember to fill the pump cavity when you use it for the first time, because the pump body itself does not store liquid, if you do not fill it in the first use, the pump will run idly, not only can’t suck the liquid. Come up, and the mechanical seal of the pump body will be burned out due to idling, so this must be paid attention to.
   So does the self priming pump need to install a foot valve?
Generally speaking, the problem of not installing the bottom valve is not very big, because the inlet of the self-priming pump usually has its own check valve, which is what we often call the one-way valve, so that after the pump stops, the pump body The liquid cannot return to the original pool and is stored in the pump body, so there is no need to fill the liquid for the second time.
But if the bottom valve is installed, the effect will naturally be better, because if the one-way valve is damaged sometimes, there is a bottom valve as a guarantee, and no idling will occur, and the installation of the bottom valve will effectively ensure the pump The effective suction range is equivalent to double insurance!
   Another special situation, but if the suction height difference is too large, or the pipe diameter of the suction pipe is too large, and the volume exceeds the amount of liquid in the pump cavity of the self-priming pump, it will not work properly. At this time, a bottom valve must be installed to ensure safe and fast self-priming.

self priming pump

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