Abstract: A burner for an exhaust gas system of an internal combustion engine includes a combustion chamber formed by a chamber element where a mixture of air as a first fluid and fuel as a second fluid is ignitable such that a component of the exhaust gas system and/or exhaust gas of the internal combustion engine that is flowable through the exhaust gas system is heatable. A channel through which at least one of the fluids is flowable opens into the combustion chamber and via the channel the at least one of the fluids is introducible into the combustion chamber. A closure element is moveable relative to the chamber element between a closed position fluidically separating the channel from the combustion chamber and a release position fluidically connecting the channel to the combustion chamber. The chamber element has a recess in which the closure element is received in the release position.

Abstract: In an injector for an accumulator injection system comprising an injector having an injector housing with an injection nozzle and an actuator for operating the injection nozzle arranged in a fuel-filled pressure space of the injector housing wherein the actuator includes a piezoelectric element disposed between an actuator head and an actuator the base with a fuel-tight casing at least partially surrounding the actuator head and the actuator base, the casing is engaged in a sealing fashion by a first annular element with the actuator base and by a second annular element with the actuator head.