The separation type self-priming system operates inside the specially designed body. In greater detail, the liquid fills the pump body through an upper opening when the pump is stopped. Then, when the machine is started, the impeller transfers the liquid from the suction zone to the discharge zone. This occurs in a very short space of time (1-2 sec). At this point, an air-liquid circuit is set up between the impeller, volute and body. The liquid returns to the volute through the hole specially made on its edge.
The speed and vorticity of the mixture which forms draws the air into the suction zone, entraining it and releasing it into the discharge zone, where the speeds are lower and the air itself can separate due to the difference in densities. The faster the circuit time of the mixture, the shorter the priming time.