Pneumatic diaphragm pump is a new type of conveying machinery, is currently the most novel kind of pump. The use of compressed air as the power source, for a variety of corrosive liquids, with particles of liquid, high viscosity, volatile, flammable, highly toxic liquid can be smoked exhausted. Pneumatic diaphragm pump has 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. Pneumatic diaphragm pump working principle 1, compressed air as power. 2, is a volumetric displacement pump caused by reciprocating deformation of the diaphragm, its working principle is similar to the piston pump, the diaphragm pump has the following characteristics due to the working principle of the diaphragm pump: (1) diaphragm pump will not overheat : Compressed air as power, when the exhaust is an expansion heat absorption process, the temperature is reduced when the pneumatic pump work, no harmful gases discharged. (2) diaphragm pump will not produce spark: pneumatic diaphragm pump without electricity as power, grounding and then prevent the electrostatic spark (3) diaphragm pump can contain particles of liquid: because the volume of work and import for the ball valve, it is not easy to be Blocking. (4) membrane pump on the material shear force is extremely low: how to suck into the work how to spit it out, so the smallest material agitation for unstable material delivery (5) diaphragm pump flow can be adjusted at the material outlet At the installation of throttle to regulate the flow. (6) diaphragm pump has a self-priming function. (7) The diaphragm pump can be air operated without danger. (8) diaphragm pump can dive work. (9) Diaphragm pumps deliver a very wide range of fluids, from low viscosity to high viscosity, from corrosive to viscous. (10) diaphragm pump without complex control system, no cables, fuses and so on. (11) diaphragm pump small size, light weight, easy to move. (12) diaphragm pump without lubrication so easy maintenance, will not be due to drip leakage of work environment. (13) Diaphragm pumps are always efficient and will not be reduced by wear. (14) 100% energy use of the diaphragm pump, shut down the outlet, the pump automatically shut down, the device moves, wear, overload, fever (15) diaphragm pump without dynamic seal, easy maintenance to avoid leakage. No dead spots at work.