Self priming pump working principle is:
Before starting the pump filled with water to the pump casing(or there is water itself within the pump casing). After the start of the high-speed rotation of the impeller to the flow in the impeller channel to the vortex shell, then the entrance to form a vacuum, so that water backstop the door open, suction tube of air into the pump and the impeller channel to reach the outer edge.
Self suction pump is a kind of self suction centrifugal pump. It has compact structure, convenient operation, smooth operation, maintenance easy, high efficiency, long life, and strong self absorption capacity, and other advantages. The pipeline does not need to install the valve, just before work to ensure the pump body fluid can be stored with quantitative cited. Different liquids can be used different material self priming pump.