1. First, determine the working voltage, current, head and flow, caliber. The general target maximum head of the pump refers to the static head without water flow when pumping the water to the maximum head. If the customer requires that the water be pumped to a certain height and then maintain a certain water flow, the head required when selecting the pump must be higher than the specified pumping height. This is determined by the supplier according to the actual situation. Refer to the head flow curve.
2. Determine the volume and shape requirements (threaded interface, inlet and outlet direction, caliber size, etc.)
3. Determine the working environment (temperature, medium)
4. Determine the functional requirements (time control, action control, pressure control, flow control, speed regulation, etc.)