Patent ID: 8038083

Claim:
A fuel injector for injecting fuel into a combustion chamber, having a magnet valve for controlling a miniature servo valve, the fuel injector comprising: a movable armature which sealingly closes a valve seat disposed in a armature chamber; the miniature servo valve being received in an injector body, the servo valve sealing off a control line from a flat seat, and upon an actuation of the magnet valve, the control line can be relieved of a high fuel pressure to a return pressure by means of the flat seat, into at least one return line; at least one diaphragm cell which reduces pressure fluctuations in the at least one return line, said diaphragm cell being disposed in a recess that communicates fluidically with the at least one return line; wherein the diaphragm cell has two circular disk-like diaphragm shells, which are joined in pressuretight fashion to one another radially around in a joined circumference to form the diaphragm cell; wherein the recess is sealed off in pressuretight fashion by a closure element, and in the recess next to the diaphragm cell, there is a prestressing or receiving element, said prestressing or receiving element mechanically bracing the diaphragm cell against the closure element along the joined circumference of the diaphragm shells; and wherein each of the closure element and the prestressing or receiving element or injector body includes a centrally disposed stop element, which are capable of limiting bulging of the diaphragm shells.