The QBY series air operated diaphragm pumps are operated with compressed air while the DBY series electric diaphragm pumps are driven by electric motor, which is suitable for pumping fluids with particles, and various liquids, which are highly viscous, volatile, corrosive or toxic, as well as colloids. The pump body is made of aluminum alloys, cast iron or stainless steel. The diaphragm is made of high quality rubber such as nitrile rubber, chloronorgutta rubber and fluorine rubber. The diaphragm pumps are widely used in the petroleum chemical, electronic, ceramic, food and textile industries.