The dosing pump is a special positive displacement pump that can meter the delivered fluid. It is generally composed of a control part, a driving part, a transmission part and an overcurrent part. The main difference between an electromagnetic diaphragm metering pump and other metering pumps is the driving part. The rated flow of the ATO dosing pump is in the range of 1.08-31.2 L/h, and the output pressure is 1.8-22.7 bar. The outlet flow of the dosing pump can be realized according to the stroke frequency.