Hydraulic double diaphragm pump---It has all characteristics of hydraulic diaphragm pump and is provided with diaphragm rupture detection device. Under the condition that any one diaphragm is broken, the other diaphragm can still work normally, and the diaphragm rupture device gives out alarming signal. It is mainly applied to flammable, combustible and toxic dangerous goods, etc. If working condition is very severe, three-diaphragm or four-diaphragm alarming pump is recommended, which is safer and more reliable.