1. Firstly, determine the working voltage, current, head and flow rate, as well as the caliber size. The maximum head of a water pump generally refers to the static head without water flow when the water is pumped to the maximum head. If the customer requests to maintain a certain water flow rate after pumping the water to a certain height, the required head when selecting a water pump must be higher than the specified pumping height. This is determined by the supplier based on the actual situation. You can refer to the head flow curve chart.

2. Determine the requirements for volume and shape (threaded interface, inlet and outlet direction, caliber size, etc.)

3. Determine the working environment (temperature, medium)

4. Determine functional requirements (time control, action control, pressure control, flow control, speed regulation, etc.)