In the analysis of the above situation, to talk about why you want to pump:
By high speed rotation of the impeller blade centrifugal force will be transported to the high-pressure side of the transmission of the export, then the suction port to form a vacuum, the medium is then inhaled, so the cycle. If no irrigation (should be exact medium), centrifugal pump is not working without the medium run, do not say, because of the impeller and the pump body of the ring gap is very small, dry friction adhesion after the turn, prone to mechanical accident, resulting in destruction of pump equipment. So in the Centrifugal Pump Handbook will first specify: non idling liquid. Simple point is that: irrigation pump is to remove the air inside the impeller, the centrifugal pump can work.
Long time hold pump, easy to cause the temperature of medium temperature, resulting in easy medium gasification, resulting in cavitation phenomenon, also is the ruined pump! Close the outlet valve usually starts, should immediately see the pressure gauge, open outlet valve, adjusted to the rated condition.
