How good the pump, if not maintained, then fail to achieve higher efficiency, so in the process of using centrifugal pumps, we should pay attention to some basic requirements. The following describes the centrifugal pump to stop working after the request. 1, centrifugal pump should be shut down after the pump inlet valve closed, to be cooled and then turn off the auxiliary system of the valve. 2, high-temperature pump parking should be implemented according to the provisions of technical documents, after parking should be 20-30 min each turn a half turn until the pump body temperature dropped to 50 ℃ so far. 3, cryogenic pump parking, when no special requirements, the pump should always be filled with liquid; suction valve and the discharge valve should be kept normally open state; using double-ended mechanical seal cryogenic pump, liquid level controller and pump seal chamber seal Fluid should maintain pump grouting pressure. 4, conveying easy to crystallize, easy to coagulate, easy precipitation and other media centrifugal pump, stop the pump should be blocked, and timely flush with water or other media pumps and pipes. 5, discharge the liquid stored in the pump to prevent corrosion and cracking.