Duplex Hydraulic Operated Diaphragm Pumps

Single Diaphragm Pumps :  A single diaphragm separates the wetted area from the hydraulic chamber. During the discharge stroke the diaphragm is balanced by the hydraulic liquid only.  (b) Double Diaphragm Pumps :  When the liquid being pumped is highly corrosive, the backup diaphragm will keep the liquid out of pump body in the primary diaphragm, allowing the diaphragm to be replaced before the pump is damaged  (c) Sandwich Diaphragm Pumps :  It's two identical diaphragms mounted together and operating as one piece. Since either diaphragm is capable of full pump performance, each is the backup of the other. Should one fail, operation continues without interruption on the other, there is no leakage or air sucked into the process and no mixing of the process fluid with the hydraulic oil. A pressure gauge reading between the diaphragms monitors the diaphragm conditions, no pressure indicates the diaphragms are okay while pressure indicates that the pump is operating on one diaphragm. "Sandwich" diaphragms have very long live years even in continuous operation.