1. Various factors such as the installation, terrain conditions, water level conditions, operating conditions, and economic schemes. Consider selecting a horizontal, vertical and other types , Vertical, upright, diving, disassembly, liquid, unobstructed, self -sucking, gear, oil -filled, water -filled temperature). The disassembly and assembly of the horizontal pump are easy to manage, easy to manage, but the volume is large, the price is more expensive, and it requires a large area; in many cases of vertical pumps, the impeller is flooded in the water. , The installation area is small and the price is cheaper.

2. According to the nature of the liquid medium, determine the water pump, the hot water pump, the oil pump, the chemical pump or the corrosion -resistant pump or the impurities pump, or use a non -blocking pump. Pumps installed in the explosive area should be used according to the level of the explosion area and use explosion -proof motors.

3. The amount of vibration is divided into: pneumatic, electric (electricity is divided into 220V voltage and 380V voltage).

4. According to the flow of flow, the menu suction pump is still a dual -suction pump: according to the height, the menu suction pump is still multiple pump, the high -speed pump is a low -speed pump (air conditioning pump), the multi -level pump efficiency is lower than the single -level pump. When the level pump and multi -stage pump can also be used, single -level pumps should be selected.