Diaphragm pump is a new type of conveying machinery, can transport a variety of corrosive liquids, with particles of liquid, high viscosity, volatile, flammable, highly toxic liquid. Diaphragm pumps have four materials: plastic, aluminum, cast iron, stainless steel. Diaphragm pumps are based on different liquid medium were nitrile rubber, neoprene, fluorine rubber, PTFE, polyhexamethylene. To meet the needs of different users. Placed in a variety of special occasions, used to pump a conventional pump can not be aspirated medium, have achieved satisfactory results. In lacquering, the diaphragm pump occupies the absolute dominant position in the ceramic industry. In other industries, such as environmental protection, waste water treatment, construction, sewage disposal and fine chemicals, it is expanding its market share and has other pump irreplaceable status. Pneumatic diaphragm pump has the following advantages: 1, due to the use of air as power, so the flow rate with the back pressure (outlet resistance) changes automatically adjusted for the viscosity of the fluid. Centrifugal pump operating point is set on the basis of water, if used for slightly higher viscosity fluid, you need to support reducer or inverter, the cost has greatly improved, the same is true of the gear pump. 2, in a flammable and explosive environment with pneumatic pump reliable and low cost, such as fuel, gunpowder, explosives, because: First, the ground is not likely to spark; second, no heat during work, the machine is not Will overheat; thirdly, the fluid will not overheat because the diaphragm pump agitates the fluid to a minimum. 3, poor construction sites, such as construction sites, industrial and mining wastewater discharge, due to the impurities in the sewage and complex composition, easy to plug the pipeline, so the formation of the pump on the load is too high, the motor heat vulnerable. Pneumatic diaphragm pump through the particles and the flow rate can be adjusted, the pipeline automatically stop blocked to patency. 4, can be used to transport the chemical properties of relatively unstable fluids, such as: photographic materials, flocculation and so on. This is because diaphragm pumps have low shear forces and little physical impact on the material. 5, in a hazardous, corrosive material handling, diaphragm pump can be completely separated from the outside world. 6, or some experiments to ensure that no impurities pollute the raw materials. In addition, the diaphragm pump is small and easy to move, does not require foundation, occupies a very small surface, easy and economical installation. Can be used as mobile material transfer pump.