What is a self-priming pump and how does it work?
Self-priming pumps are designed with an external casing that ‘floods’ the inner pump or volute. When the centrifugal pump is turned on, the impeller rotates counter clockwise, creating a low-pressure area in the eye of the impeller. As the pressure is lower than atmosphere, water is pushed up into the suction pipe by atmospheric pressure, which subsequently forces all the air in the suction line into the pump. The self-priming pump mixes the air with the recirculating water in the casing. As this occurs, the air separates from the liquid and discharges from the casing.
When all the air in the suction line is displaced, the pump delivers the flow like any other centrifugal pump.The self-priming pump can use with electric motor or diesel engine.
