Electromagnetic metering pump uses an electromagnetic push rod to drive the diaphragm to reciprocate inside the pump head, causing changes in the volume and pressure of the pump head chamber. The changes in pressure cause the opening and closing of the suction and discharge valves, achieving quantitative suction and discharge of liquid. Electromagnetic metering pump is a type of metering pump designed to transport low flow and low-pressure pipeline liquids driven by an electromagnet. It is popular in the industry for its simple structure, low energy consumption, accurate measurement, and convenient adjustment. Its design principle is simple and practical, but its shortcomings are small metering flow rate (commonly 90 liters per hour) and relatively low requirements for pipeline pressure, which also limits its industrial application in some aspects. Electromagnetic metering pumps are widely used in various sectors such as petroleum, chemical, power metallurgy, mining, shipbuilding, light industry, agriculture, civil and national defense.