Diaphragm pump is a new transportation machinery, is currently the international community as a relatively new type of pump. Diaphragm pump with compressed air as power source, through the work of two symmetrical cavity synchronous reciprocating diaphragm movement and the role of one-way valve to change the working chamber volume, thus the liquid continuous suction and discharge. The unit of time for the plastic volume and an external compressed air pressure of the pressure, then glue a large quantity of small and vice versa. Pneumatic diaphragm pump applied to transport all kinds of corrosive liquid, with particles of liquid and high-viscosity, volatile, flammable, poisonous liquid