Air Operated Diaphragm Pump Sepcification as follows: 1, Material: Aaluminum. 2, Max Air Pressure: 7 bar 1, QBY Type Air Operated Diaphragm Pump adopts and compresses the air pneumatically as the motive force source its detials as follows:. ItemMaterialMax Deliver HegtMax Grain DiameterSuction heightMax air pressureQBY-10ALU, IRON, PTFE0-50m 1 6 7barQBY-15ALU, IRON, PTFE0-50m 1 6 7barQBY-20ALU, ...