... Diaphragm Pump Summarize: QBY Air operated Diaphragm Pump is the new kind of transportation machine, adopting compress air, smoke and industry ... exhaust gas as power source. QBY air operated double diaphragm pumps not ... fluoride rubber, Buna-N rubber and Teflon. 3. QBY air diaphragm pump not only can exhaust the flow liquid, but ...