The J-type metering pump includes JW, JX, JZ, JD, JT, J1, J2, J3, J4, J5, J6 base series, with over 4000 specifications and models. The product specifications are complete and can be divided into plunger type, diaphragm type, and insulated metering pumps according to the form of the pump cylinder head. This pump is widely used in fields such as petrochemicals, light industry, electricity, environmental protection, food, medicine, water treatment, national defense, military industry, and scientific research. The conveying medium is various liquids without solid particles and suspensions with particle sizes below 0.01. The flow can be accurately adjusted. Its mediation form can be divided into three adjustment methods: manual pneumatic control and electronic control: it can also be adjusted by manual pneumatic control or manual electric control. The measurement accuracy can reach plus or minus 1%. Diaphragm metering pumps use diaphragms. The safe separation between the medium and the power end ensures that the ring will not leak, making it particularly suitable for transporting flammable, explosive, toxic and other media. The diaphragm metering pump can be equipped with an alarm device. If the diaphragm ruptures, it can promptly alarm and shut down, avoiding oil contamination of the pipeline. According to user needs, multiple cylinders with the same parameters can be connected in series or multiple cylinders with different parameters can be connected in series.