1) Before starting, a certain amount of starting circulating water shall be injected into the pump body when the self-priming centrifugal pump is started for the first time; The centrifugal pump just needs to fill the water inlet pipe and pump body with water at the same time each time when starting, or use auxiliary devices to pump air into the water inlet pipe.

2) On the device, the self-priming centrifugal pump is only equipped with a filter screen at the lower end of the inlet pipe without a bottom valve; The centrifugal pump must be equipped with a bottom valve at the lower end of the inlet pipe or an air extraction device at the outlet.

3) During operation, self priming centrifugal pumps with the same performance parameters are generally lower in efficiency and poor in cavitation performance than centrifugal pumps.

The above is the difference between self-priming pump and centrifugal pump. You can leave a message to supplement.