It is a single stage double suction centrifugal pump that feeds water from both sides of the impeller. As the pump cover and body are assembled using horizontal seams, it is also known as a horizontally split centrifugal pump. Compared with single stage single suction centrifugal pumps, it has high efficiency, large flow rate, and higher head. But it is large and relatively bulky, usually used for fixed operations. Suitable for irrigation areas with moderate areas in hills and plateaus, as well as for factories, mines, urban water supply and drainage, etc.

There are several models of single stage double suction centrifugal pumps, including S-type, Sh type, SA type, and SLA type. The difference between S-type and Sh type is that from the driving end, S-type pumps rotate clockwise while Sh type rotates counterclockwise. The SLA type is a vertical single stage double suction centrifugal pump.

The performance range of the S-type pump is 160-1800 cubic meters per hour, with a head of 12-125 meters, an inlet diameter of 150-1400 millimeters, and a rotational speed of 2950, 1450, 970, 730, 585, 485, and 360 revolutions per minute.

(1) The performance range of the D-type pump is 6.3-720 cubic meters per hour, with a head of 16-600 meters and inlet diameters of 50, 75, 100, 125, 150, and 200 millimeters. The 50-125 millimeter pump type has a high speed of 2950 revolutions per minute, and the 150-200 millimeter pump type has a speed of 1480 revolutions per minute.

(2) The structure type of the D-type multi-stage centrifugal pump is a horizontal multi-stage (2-12 stages), with a single suction impeller and a segmented pump body. When the first stage impeller is double suction, it is represented by DS. When two speeds are specified at the same time, low speed is represented by DA. For multi-stage centrifugal pumps used for boiler feedwater, it is represented by DG.