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The Difference between a Self-Priming Pump and a Centrifugal Pump

Learn - Mar. 03, 2021

Many users do not know the difference between self-priming pumps and centrifugal pumps, in fact, self-priming pumps also belong to a type of centrifugal pump, but self-priming pumps have a higher pump body with a certain storage capacity, do not need to install the bottom valve in the suction pipe after the first irrigation can be sucked up centrifugal pump products, so you can also call self-priming pumps centrifugal pumps, the function can also be called self-priming centrifugal pumps. The next centrifugal pump supplier will explain the difference between self-priming pumps and centrifugal pumps

The difference between a self-priming pump and a centrifugal pump

The main difference between self-priming and centrifugal pumps is that self-priming pumps do not require a bottom valve to be installed in the inlet pipeline and can suck up water after the first filling with priming water.

The centrifugal pump is to play the role of a booster, the liquid level must be higher than the pump, to be able to flow to the pump body to start, if the liquid level is lower than the centrifugal pump can only be installed in the inlet pipeline inlet bottom valve to fill the pump and pipeline inside the liquid to achieve the function of self-priming, or in the import installation of the diversion tube, such as the pump does not work for a long time centrifugal pump, in the second start when the inlet pipeline and the pump body inside the water has basically no, and again have to fill a diversion, and the pump body has to be filled with water. It is more troublesome to operate because the bottom valve seal of the centrifugal pump inlet cannot be completely sealed for a long time and the liquid will slowly leak back into the pool.

Centrifugal Pump

Self-priming centrifugal pumps all use the axial return structure of the pump body. The centrifugal pump body consists of an inhalation chamber, a liquid storage chamber, a vortex chamber, a liquid return hole, a gas-liquid separation chamber, etc. After the centrifugal pump is started normally, the impeller will inhale the liquid stored in the inhalation chamber and the air in the inhalation tube together and be completely mixed in the impeller.

The gas-liquid mixture enters the gas separation chamber through the diffusion tube. At this point, due to the sudden reduction in flow rate, the lighter gas is separated from the mixed liquid, and the gas continues to rise through the pump body spout and is discharged. The degassed liquid returns to the reservoir and enters the impeller again by the return hole, mixing again with the gas drawn from the suction pipe inside the impeller, and flowing to the outer edge of the impeller under the action of the high-speed rotating impeller. As this process continues week after week, the air in the suction pipe is constantly reduced until the air is sucked out, the self-priming pump will complete the self-priming process, the centrifugal pump will be put into normal operation. Because of this unique venting capability, this self-priming pump is capable of transporting liquids containing gases without the need for a foot valve and has a good sweeping function when used on cruise ships.

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