Metering device with dynamic sealing

A metering device for dosing pressurized fluids, in particular an injection valve for a fuel injection system in an internal combustion engine, is disclosed in which the hermetic sealing between the fluid chamber (2) for the pressurized fluid to be dosed and the actuator chamber (9) is provided by an elastic element that is hermetically fastened to the valve body (1) and to a bottom cap (8) of the actuator assembly (7, 8) or a thermal compensator.