Compared with a single -grade pump, the difference is that the multi -stage pump has two or more impeller, which can absorb water and press water in multiple levels in sections, so as to raise the water to a high position. The level of the pump leaf wheel. Multi -level pumps are mainly used for mines, water supply, urban and factories, and there are very few agricultural irrigation. It is only suitable for high -rising and small -flowing high mountains. Multi -level high -hearted pumps have two types: stand and horizontal type. The main types are DL, DL -type multi -level centrifugal pumps, and DW and DWL small -scale multi -level centrifugal pumps.

(1) The performance range of the multi -level pump of D -type D -level pump is 6.3 to 720 cubic meters per hour, and the journey is 16 to 600 meters. The high speed is 2950 rpm/cents, and the speed of 150 to 200mm pump pump is 1480 rpm.

(2) Structural type D -type multi -level centrifugal pump is a horizontal multi -level (level 2-12), the impeller is single suction, and the pump body is segmented. When the first -stage impeller is a double suction, use DS to indicate that when there are two speeds at the same time, it is expressed at low speeds at low speeds, and multi -level centrifugal pumps used for boiler water to water are represented by DG.