A double diaphragm(AODD Pump) is a positive displacement pump which utilises two flexible diaphragms that reciprocate back and forth, creating a temporary chamber. The flexible diaphragms both draws in and expels fluid through the pump. The diaphragms work as a separation wall between the air and the liquid. The first stroke The two diaphragms that are connected by a shaft through the centre section where the air valve is located. The purpose of the air valve is to direct the compressed air to the back of diaphragm number one causing it to move away from the centre section. The number one diaphragm causes a press stroke moving liquid out of the pump. At the same time diaphragm number two is performing a suction stroke. The air behind diaphragm number two is being pushed out to the atmosphere causing atmospheric pressure to push the liquid to the suction side. The suction ball valve is pushed away off its seat allowing the fluid to flow past the ball valve into the liquid cham...

Pneumatic diaphragm pumps are used widely in the national economy. A “weak” component of such air operated diaphragm pump is the diaphragm, upon which depends the duration of continuous operation of the pump. The service life of the diaphragm depends on the design and materials of the diaphragm, temperature, and corrosiveness of the pumped medium. Our double diaphragm pump with Longer life time Diaphragm. Material: Hytrel from Dupont, Santoprene from Exxon, PTFE from Dakin and Saint-Gobain etc. Design: Increase the height of the diaphragm's arch portion, ensure to reduce the force to the diaphragm edge portation and avoid the diaphragms been pull out. Center place with O-ring design, enhance seal performance. DEFU Diaphragm Material And Operating Temperature Limitation DEFU is the main and professional diaphragm pump manufacturer in China. Our company have CE and ISO9001 certificate. Any inquiry, pls feel free to contact with Ms Cindy， Ema...

Diaphragm pumps are popular in industrial area , can pump various fluids drastically, whether corrosive, volatile, flammable, poisonous liquid even fluids with particles and high viscosity. They have a long history of use in water and waste water treatment and can also be found in filter press, oil ink, painting and ship building etc. Advantage of DEFU Air Diaphragm Pump Convenient Maintenance Unique Patented Air Valve Parts That Are Precisely Fit Solids External Structure Compatibility of Fluid Good Self Priming Function Can Achieve High Pressure It is of great importance to correctly use materials , such as diaphragm, valve balls, valve seats and pump body both need to the suitable materials base on your pumping liquid.