... 2,lift 30m 3,supporting power 3hp. 4,speed:2600r/min The ZB series self-priming centrifugal pumps ... pump, you should fill the pump with water before start, then the impeller rotate with ... impeller lower than atmosphere pressure. While the water pressure along the direction of impeller radius ... water. The suction of the self-priming pump is not exceed one atmos, around 11meters. 40ZB30-2.2 irrigation water ...