A distinguishing feature of self priming pumps that differ from centrifugal pumps is that they do not need to be filled at the time of use. However, when using it for the first time, be sure to remember to fill the pump cavity, because the pump itself does not store liquid. If the water is not poured into the first time, the pump will idling, not only the liquid can be sucked. Come up, and you will burn out the parts such as the machine seal of the pump body because of idling, so be sure to pay attention to this.
The self priming pump can send water out due to the centrifugal force. Before the pump is working, the pump body and the inlet pipe must be filled with water to be in a vacuum state. When the impeller rotates rapidly, the blade causes the water to rotate quickly, and the rotating water flies from the impeller under the action of centrifugal force. After the water is thrown, the central portion of the impeller forms a vacuum region. The water of the water source is pressed into the water inlet pipe through the pipe network under the action of atmospheric pressure (or water pressure). This cycle is not enough, you can achieve continuous pumping. It is worth mentioning here that the self-priming centrifugal pump must be filled with water in the pump casing before it can be started. Otherwise, the pump body will be heated, vibrated, and the water output will be reduced, causing damage to the pump (referred to as “cavitation”. ") caused equipment accidents!
The difference between the self priming pump and the bottom valve
1, the installation of the bottom valve
If the bottom valve is added, the effect will be better, because if the check valve is damaged sometimes, and the bottom valve is used as a guarantee, there will be no idling, and the effective suction of the pump will be effectively ensured after the bottom valve is installed. Cheng!
Another special case, but if the suction height difference is too large, or the pipette diameter is too large, the volume exceeds the liquid storage volume in the pumping chamber 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.
2. What if the bottom valve is not installed?
Generally speaking, it is not necessary to install the bottom valve, because the inlet of the self priming pump has its own check valve, which is a check valve that we often say, so that the liquid in the pump body cannot be stopped after the pump stops. It is returned to the original tank and stored in the pump body, so there is no need to add liquid when using it for the second time.