Principle of self-priming pump

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The working principle of a self-priming pump is that the pump chamber is filled with water before the pump is started (or there is already water in the pump chamber). Upon startup, the high-speed rotation of the impeller causes the water in the impeller channels to flow toward the volute; this creates a vacuum at the inlet, which opens the inlet check valve. Air from the suction pipe enters the pump and then reaches the outer edge via the impeller channels. The self-priming pump is a type of self-priming centrifugal pump that offers advantages such as a compact structure, easy operation, smooth performance, simple maintenance, high efficiency, long service life, and strong self-priming capability. There is no need to install a foot valve in the pipeline; before operation, it is sufficient to ensure that a certain amount of liquid is stored inside the pump. Different liquids can use self-priming pumps made of different materials. China Pump Industry Network