The Series CQ magnetic pumps with the recent advanced technologies of the field. The product combines the advantages of the magnetic pumps such as fully sealing and corrosion resistance, and the features of self-priming pumps such as simple line structure without bottom valve and easy operation without filling liquid for being primed. The maximum priming height is 4 m. The self-priming magnetic pumps are widely used in the petroleum, chemical, pharmaceutical, electric plating, dyeing and printing, food, agrochemical, and metallurgical industries for pumping acids, alkali, oils, valuable liquids, toxic or volatile liquids, especially flammable, easy to leak.