A pump is a machine that transports or pressurizes liquid. It transmits the mechanical energy or other external energy of the prime mover to the liquid to increase the energy of the liquid, which is mainly used to transport liquids including water, oil, acid lye, emulsion, suspension emulsion and liquid metal.
It can also transport liquids, gas mixtures and liquids containing suspended solids. The technical parameters of pump performance include flow, suction, head, shaft power, water power, efficiency, etc. According to different working principles can be divided into positive displacement pump, vane pump and other types. Positive displacement pump is the use of its studio volume changes to transfer energy; Blade pump is the use of rotary blade and water interaction to transfer energy, centrifugal pump, axial flow pump and mixed flow pump and other types. It can be manufactured by CNC engraving, Sand Casting, transparent acrylic(PMMA/PC) 3D Printing.

The single-stage double-suction centrifugal pump, which is fed from both sides of the impeller, is also called the horizontal open-type centrifugal pump because the pump cover and pump body are assembled with horizontal joints. Compared with single-stage single-suction centrifugal pump, it has high efficiency, large flow and higher head. However, the volume is large and relatively bulky, and it is generally used for fixed operations. It is suitable for irrigation areas of hills and plateaus, as well as for factories, mines and urban water supply and drainage.
Single stage double suction centrifugal pump has S type, Sh type, SA type, SLA type several models, the difference between S type and Sh type is that from the driving end, S type pump rotates clockwise, Sh type rotates counterclockwise. SLA type is a vertical single-stage double suction centrifugal pump.
S-type pump performance range flow rate 160 ~ 18000 cubic meters/hour, head 12 ~ 125 meters, inlet diameter 150 ~ 1400 mm, speed 2950, 1450, 970, 730, 585, 485, 360 RPM.
(1) D type pump performance range flow 6.3 ~ 720 cubic meters/hour, head 16 ~ 600 meters, water inlet caliber: 50, 75, 100, 125, 150, 200 mm, of which 50 ~ 125 mm pump type for high speed 2950 RPM, 150 ~ 200 mm pump speed of 1480 RPM.
(2) The type D multi-stage centrifugal pump is horizontal multi-stage (2 ~ 12 stages), the impeller is single suction, and the pump body is segmented. When the first stage impeller is double suction, it is expressed by DS, when two speeds are specified at the same time, the low speed is expressed by DA, and the multi-stage centrifugal pump for boiler feed water is expressed by DG.