The old pump models include BA and B single stage single suction centrifugal pumps. In the 1980s, China updated and developed centrifugal pump products based on international standards and the actual situation of drainage and irrigation machinery, and produced IB and IQ single stage centrifugal pump series products, which have been listed as national professional standards and industry standards.

A single stage single suction centrifugal pump is called a single stage single suction centrifugal pump, where water enters the impeller from an axial direction on one side and there is only one impeller. Its characteristics are that compared with mixed flow pumps and axial flow pumps, it has a higher head, smaller flow rate, simple structure, and convenient use.

IQ type single stage single suction centrifugal pump (also known as light and small centrifugal pump) is designed for the national conditions of China and meets the requirements of users for simple structure, light weight, low price, good performance, and convenient matching. There are a total of 84 products, divided into 3 derivative series, and 413 specifications and models.

(1) Performance range: The pump has a diameter of 50-200 millimeters, a flow rate of 12.5-400 cubic meters per hour, a head of 8-125 meters, and is equipped with diesel engine direct connection, belt transmission, and electric motor direct connection. The power is 1.1-110 kilowatts, and the speed is 1450-2900 revolutions per minute.

(2) The structural type of light and small centrifugal pump is an axial suction single stage single suction suspension centrifugal pump. The pump body opens the door at the back, and the outlet is located in the center upwards. The back cover is a pressure embedded type, and the bearing body is directly connected to the pump body. The pump foot is located below the pump body, and the bearings are lubricated with butter. The shaft seal is divided into three types: soft packing, mechanical seal, and rubber oil seal. The impellers are all closed, and the transmission is divided into two types: coupling transmission and belt transmission. Pump impeller rotation: From the direction of the pump inlet, the impeller rotation is clockwise, and when the pump is directly connected to the diesel engine for transmission, it is counterclockwise. The pump outlet can be equipped with a manual pump, which can remove the bottom valve, reduce hydraulic loss, and enable the pump to self suction.