Sealing arrangement of a piezo actuator of a fuel injector

The sealing device (10) has a head device (14), on which a sealing unit is mounted by means of projecting connecting pins (12). The sealing unit (18) is mounted on the head device. This unit has apertures through which the connecting pins can pass, and has a carrier (22) to which a sealing material (26) is applied closely round the connecting pins and the circumference of the head unit. Part (20) of it is made of micro-porous material.